Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU changes from Ingo Molar: "The main changes: - torture-test updates - callback-offloading changes - maintainership changes - update RCU documentation - miscellaneous fixes" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (32 commits) rcu: Allow for NULL tick_nohz_full_mask when nohz_full= missing rcu: Fix a sparse warning in rcu_report_unblock_qs_rnp() rcu: Fix a sparse warning in rcu_initiate_boost() rcu: Fix __rcu_reclaim() to use true/false for bool rcu: Remove CONFIG_PROVE_RCU_DELAY rcu: Use __this_cpu_read() instead of per_cpu_ptr() rcu: Don't use NMIs to dump other CPUs' stacks rcu: Bind grace-period kthreads to non-NO_HZ_FULL CPUs rcu: Simplify priority boosting by putting rt_mutex in rcu_node rcu: Check both root and current rcu_node when setting up future grace period rcu: Allow post-unlock reference for rt_mutex rcu: Loosen __call_rcu()'s rcu_head alignment constraint rcu: Eliminate read-modify-write ACCESS_ONCE() calls rcu: Remove redundant ACCESS_ONCE() from tick_do_timer_cpu rcu: Make rcu node arrays static const char * const signal: Explain local_irq_save() call rcu: Handle obsolete references to TINY_PREEMPT_RCU rcu: Document deadlock-avoidance information for rcu_read_unlock() scripts: Teach get_maintainer.pl about the new "R:" tag rcu: Update rcu torture maintainership filename patterns ...
This commit is contained in:
Linus Torvalds
commit
5bda4f638f
40 changed files with 491 additions and 176 deletions
|
|
@ -2451,8 +2451,8 @@ lot of {Linux} into your technology!!!"
|
|||
,month="February"
|
||||
,year="2010"
|
||||
,note="Available:
|
||||
\url{http://kerneltrap.com/mailarchive/linux-netdev/2010/2/26/6270589}
|
||||
[Viewed March 20, 2011]"
|
||||
\url{http://thread.gmane.org/gmane.linux.network/153338}
|
||||
[Viewed June 9, 2014]"
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||||
,annotation={
|
||||
Use a pair of list_head structures to support RCU-protected
|
||||
resizable hash tables.
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||||
|
|
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|||
|
|
@ -1,5 +1,14 @@
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|||
Reference-count design for elements of lists/arrays protected by RCU.
|
||||
|
||||
|
||||
Please note that the percpu-ref feature is likely your first
|
||||
stop if you need to combine reference counts and RCU. Please see
|
||||
include/linux/percpu-refcount.h for more information. However, in
|
||||
those unusual cases where percpu-ref would consume too much memory,
|
||||
please read on.
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|
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------------------------------------------------------------------------
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Reference counting on elements of lists which are protected by traditional
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reader/writer spinlocks or semaphores are straightforward:
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|
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|
|
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|||
|
|
@ -2813,6 +2813,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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quiescent states. Units are jiffies, minimum
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value is one, and maximum value is HZ.
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rcutree.rcu_nocb_leader_stride= [KNL]
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Set the number of NOCB kthread groups, which
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defaults to the square root of the number of
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CPUs. Larger numbers reduces the wakeup overhead
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on the per-CPU grace-period kthreads, but increases
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that same overhead on each group's leader.
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|
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rcutree.qhimark= [KNL]
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Set threshold of queued RCU callbacks beyond which
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batch limiting is disabled.
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|
|
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|
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@ -757,10 +757,14 @@ SMP BARRIER PAIRING
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When dealing with CPU-CPU interactions, certain types of memory barrier should
|
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always be paired. A lack of appropriate pairing is almost certainly an error.
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|
||||
A write barrier should always be paired with a data dependency barrier or read
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||||
barrier, though a general barrier would also be viable. Similarly a read
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||||
barrier or a data dependency barrier should always be paired with at least an
|
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write barrier, though, again, a general barrier is viable:
|
||||
General barriers pair with each other, though they also pair with
|
||||
most other types of barriers, albeit without transitivity. An acquire
|
||||
barrier pairs with a release barrier, but both may also pair with other
|
||||
barriers, including of course general barriers. A write barrier pairs
|
||||
with a data dependency barrier, an acquire barrier, a release barrier,
|
||||
a read barrier, or a general barrier. Similarly a read barrier or a
|
||||
data dependency barrier pairs with a write barrier, an acquire barrier,
|
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a release barrier, or a general barrier:
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||||
|
||||
CPU 1 CPU 2
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||||
=============== ===============
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|
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@ -1893,6 +1897,21 @@ between the STORE to indicate the event and the STORE to set TASK_RUNNING:
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<general barrier> STORE current->state
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LOAD event_indicated
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||||
|
||||
To repeat, this write memory barrier is present if and only if something
|
||||
is actually awakened. To see this, consider the following sequence of
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events, where X and Y are both initially zero:
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||||
|
||||
CPU 1 CPU 2
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=============================== ===============================
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X = 1; STORE event_indicated
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smp_mb(); wake_up();
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Y = 1; wait_event(wq, Y == 1);
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wake_up(); load from Y sees 1, no memory barrier
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load from X might see 0
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In contrast, if a wakeup does occur, CPU 2's load from X would be guaranteed
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to see 1.
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|
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The available waker functions include:
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complete();
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|
|
|
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18
MAINTAINERS
18
MAINTAINERS
|
|
@ -70,6 +70,8 @@ Descriptions of section entries:
|
|||
|
||||
P: Person (obsolete)
|
||||
M: Mail patches to: FullName <address@domain>
|
||||
R: Designated reviewer: FullName <address@domain>
|
||||
These reviewers should be CCed on patches.
|
||||
L: Mailing list that is relevant to this area
|
||||
W: Web-page with status/info
|
||||
Q: Patchwork web based patch tracking system site
|
||||
|
|
@ -7443,10 +7445,14 @@ L: linux-kernel@vger.kernel.org
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|||
S: Supported
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
|
||||
F: Documentation/RCU/torture.txt
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||||
F: kernel/rcu/torture.c
|
||||
F: kernel/rcu/rcutorture.c
|
||||
|
||||
RCUTORTURE TEST FRAMEWORK
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
M: Josh Triplett <josh@joshtriplett.org>
|
||||
R: Steven Rostedt <rostedt@goodmis.org>
|
||||
R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
||||
R: Lai Jiangshan <laijs@cn.fujitsu.com>
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||||
L: linux-kernel@vger.kernel.org
|
||||
S: Supported
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
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|
|
@ -7469,8 +7475,11 @@ S: Supported
|
|||
F: net/rds/
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||||
|
||||
READ-COPY UPDATE (RCU)
|
||||
M: Dipankar Sarma <dipankar@in.ibm.com>
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
M: Josh Triplett <josh@joshtriplett.org>
|
||||
R: Steven Rostedt <rostedt@goodmis.org>
|
||||
R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
||||
R: Lai Jiangshan <laijs@cn.fujitsu.com>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
W: http://www.rdrop.com/users/paulmck/RCU/
|
||||
S: Supported
|
||||
|
|
@ -7480,7 +7489,7 @@ X: Documentation/RCU/torture.txt
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|||
F: include/linux/rcu*
|
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X: include/linux/srcu.h
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||||
F: kernel/rcu/
|
||||
X: kernel/rcu/torture.c
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X: kernel/torture.c
|
||||
|
||||
REAL TIME CLOCK (RTC) SUBSYSTEM
|
||||
M: Alessandro Zummo <a.zummo@towertech.it>
|
||||
|
|
@ -8263,6 +8272,9 @@ F: mm/sl?b*
|
|||
SLEEPABLE READ-COPY UPDATE (SRCU)
|
||||
M: Lai Jiangshan <laijs@cn.fujitsu.com>
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
M: Josh Triplett <josh@joshtriplett.org>
|
||||
R: Steven Rostedt <rostedt@goodmis.org>
|
||||
R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
W: http://www.rdrop.com/users/paulmck/RCU/
|
||||
S: Supported
|
||||
|
|
|
|||
|
|
@ -102,12 +102,6 @@ extern struct group_info init_groups;
|
|||
#define INIT_IDS
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||||
#endif
|
||||
|
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#ifdef CONFIG_RCU_BOOST
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||||
#define INIT_TASK_RCU_BOOST() \
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.rcu_boost_mutex = NULL,
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||||
#else
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#define INIT_TASK_RCU_BOOST()
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#endif
|
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#ifdef CONFIG_TREE_PREEMPT_RCU
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#define INIT_TASK_RCU_TREE_PREEMPT() \
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.rcu_blocked_node = NULL,
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|
|
@ -119,8 +113,7 @@ extern struct group_info init_groups;
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.rcu_read_lock_nesting = 0, \
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.rcu_read_unlock_special = 0, \
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.rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry), \
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INIT_TASK_RCU_TREE_PREEMPT() \
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INIT_TASK_RCU_BOOST()
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INIT_TASK_RCU_TREE_PREEMPT()
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#else
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||||
#define INIT_TASK_RCU_PREEMPT(tsk)
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#endif
|
||||
|
|
|
|||
|
|
@ -826,15 +826,14 @@ static inline void rcu_preempt_sleep_check(void)
|
|||
* read-side critical section that would block in a !PREEMPT kernel.
|
||||
* But if you want the full story, read on!
|
||||
*
|
||||
* In non-preemptible RCU implementations (TREE_RCU and TINY_RCU), it
|
||||
* is illegal to block while in an RCU read-side critical section. In
|
||||
* preemptible RCU implementations (TREE_PREEMPT_RCU and TINY_PREEMPT_RCU)
|
||||
* in CONFIG_PREEMPT kernel builds, RCU read-side critical sections may
|
||||
* be preempted, but explicit blocking is illegal. Finally, in preemptible
|
||||
* RCU implementations in real-time (with -rt patchset) kernel builds,
|
||||
* RCU read-side critical sections may be preempted and they may also
|
||||
* block, but only when acquiring spinlocks that are subject to priority
|
||||
* inheritance.
|
||||
* In non-preemptible RCU implementations (TREE_RCU and TINY_RCU),
|
||||
* it is illegal to block while in an RCU read-side critical section.
|
||||
* In preemptible RCU implementations (TREE_PREEMPT_RCU) in CONFIG_PREEMPT
|
||||
* kernel builds, RCU read-side critical sections may be preempted,
|
||||
* but explicit blocking is illegal. Finally, in preemptible RCU
|
||||
* implementations in real-time (with -rt patchset) kernel builds, RCU
|
||||
* read-side critical sections may be preempted and they may also block, but
|
||||
* only when acquiring spinlocks that are subject to priority inheritance.
|
||||
*/
|
||||
static inline void rcu_read_lock(void)
|
||||
{
|
||||
|
|
@ -858,6 +857,34 @@ static inline void rcu_read_lock(void)
|
|||
/**
|
||||
* rcu_read_unlock() - marks the end of an RCU read-side critical section.
|
||||
*
|
||||
* In most situations, rcu_read_unlock() is immune from deadlock.
|
||||
* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
|
||||
* is responsible for deboosting, which it does via rt_mutex_unlock().
|
||||
* Unfortunately, this function acquires the scheduler's runqueue and
|
||||
* priority-inheritance spinlocks. This means that deadlock could result
|
||||
* if the caller of rcu_read_unlock() already holds one of these locks or
|
||||
* any lock that is ever acquired while holding them.
|
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*
|
||||
* That said, RCU readers are never priority boosted unless they were
|
||||
* preempted. Therefore, one way to avoid deadlock is to make sure
|
||||
* that preemption never happens within any RCU read-side critical
|
||||
* section whose outermost rcu_read_unlock() is called with one of
|
||||
* rt_mutex_unlock()'s locks held. Such preemption can be avoided in
|
||||
* a number of ways, for example, by invoking preempt_disable() before
|
||||
* critical section's outermost rcu_read_lock().
|
||||
*
|
||||
* Given that the set of locks acquired by rt_mutex_unlock() might change
|
||||
* at any time, a somewhat more future-proofed approach is to make sure
|
||||
* that that preemption never happens within any RCU read-side critical
|
||||
* section whose outermost rcu_read_unlock() is called with irqs disabled.
|
||||
* This approach relies on the fact that rt_mutex_unlock() currently only
|
||||
* acquires irq-disabled locks.
|
||||
*
|
||||
* The second of these two approaches is best in most situations,
|
||||
* however, the first approach can also be useful, at least to those
|
||||
* developers willing to keep abreast of the set of locks acquired by
|
||||
* rt_mutex_unlock().
|
||||
*
|
||||
* See rcu_read_lock() for more information.
|
||||
*/
|
||||
static inline void rcu_read_unlock(void)
|
||||
|
|
|
|||
|
|
@ -1270,9 +1270,6 @@ struct task_struct {
|
|||
#ifdef CONFIG_TREE_PREEMPT_RCU
|
||||
struct rcu_node *rcu_blocked_node;
|
||||
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
||||
#ifdef CONFIG_RCU_BOOST
|
||||
struct rt_mutex *rcu_boost_mutex;
|
||||
#endif /* #ifdef CONFIG_RCU_BOOST */
|
||||
|
||||
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
|
||||
struct sched_info sched_info;
|
||||
|
|
@ -2009,9 +2006,6 @@ static inline void rcu_copy_process(struct task_struct *p)
|
|||
#ifdef CONFIG_TREE_PREEMPT_RCU
|
||||
p->rcu_blocked_node = NULL;
|
||||
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
||||
#ifdef CONFIG_RCU_BOOST
|
||||
p->rcu_boost_mutex = NULL;
|
||||
#endif /* #ifdef CONFIG_RCU_BOOST */
|
||||
INIT_LIST_HEAD(&p->rcu_node_entry);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@
|
|||
#include <linux/hrtimer.h>
|
||||
#include <linux/context_tracking_state.h>
|
||||
#include <linux/cpumask.h>
|
||||
#include <linux/sched.h>
|
||||
|
||||
#ifdef CONFIG_GENERIC_CLOCKEVENTS
|
||||
|
||||
|
|
@ -162,6 +163,7 @@ static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
|
|||
#ifdef CONFIG_NO_HZ_FULL
|
||||
extern bool tick_nohz_full_running;
|
||||
extern cpumask_var_t tick_nohz_full_mask;
|
||||
extern cpumask_var_t housekeeping_mask;
|
||||
|
||||
static inline bool tick_nohz_full_enabled(void)
|
||||
{
|
||||
|
|
@ -194,6 +196,24 @@ static inline void tick_nohz_full_kick_all(void) { }
|
|||
static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
|
||||
#endif
|
||||
|
||||
static inline bool is_housekeeping_cpu(int cpu)
|
||||
{
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
if (tick_nohz_full_enabled())
|
||||
return cpumask_test_cpu(cpu, housekeeping_mask);
|
||||
#endif
|
||||
return true;
|
||||
}
|
||||
|
||||
static inline void housekeeping_affine(struct task_struct *t)
|
||||
{
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
if (tick_nohz_full_enabled())
|
||||
set_cpus_allowed_ptr(t, housekeeping_mask);
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void tick_nohz_full_check(void)
|
||||
{
|
||||
if (tick_nohz_full_enabled())
|
||||
|
|
|
|||
|
|
@ -505,7 +505,7 @@ config PREEMPT_RCU
|
|||
def_bool TREE_PREEMPT_RCU
|
||||
help
|
||||
This option enables preemptible-RCU code that is common between
|
||||
the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.
|
||||
TREE_PREEMPT_RCU and, in the old days, TINY_PREEMPT_RCU.
|
||||
|
||||
config RCU_STALL_COMMON
|
||||
def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE )
|
||||
|
|
@ -737,7 +737,7 @@ choice
|
|||
|
||||
config RCU_NOCB_CPU_NONE
|
||||
bool "No build_forced no-CBs CPUs"
|
||||
depends on RCU_NOCB_CPU && !NO_HZ_FULL
|
||||
depends on RCU_NOCB_CPU && !NO_HZ_FULL_ALL
|
||||
help
|
||||
This option does not force any of the CPUs to be no-CBs CPUs.
|
||||
Only CPUs designated by the rcu_nocbs= boot parameter will be
|
||||
|
|
@ -751,7 +751,7 @@ config RCU_NOCB_CPU_NONE
|
|||
|
||||
config RCU_NOCB_CPU_ZERO
|
||||
bool "CPU 0 is a build_forced no-CBs CPU"
|
||||
depends on RCU_NOCB_CPU && !NO_HZ_FULL
|
||||
depends on RCU_NOCB_CPU && !NO_HZ_FULL_ALL
|
||||
help
|
||||
This option forces CPU 0 to be a no-CBs CPU, so that its RCU
|
||||
callbacks are invoked by a per-CPU kthread whose name begins
|
||||
|
|
|
|||
|
|
@ -99,6 +99,10 @@ static inline void debug_rcu_head_unqueue(struct rcu_head *head)
|
|||
|
||||
void kfree(const void *);
|
||||
|
||||
/*
|
||||
* Reclaim the specified callback, either by invoking it (non-lazy case)
|
||||
* or freeing it directly (lazy case). Return true if lazy, false otherwise.
|
||||
*/
|
||||
static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
|
||||
{
|
||||
unsigned long offset = (unsigned long)head->func;
|
||||
|
|
@ -108,12 +112,12 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
|
|||
RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset));
|
||||
kfree((void *)head - offset);
|
||||
rcu_lock_release(&rcu_callback_map);
|
||||
return 1;
|
||||
return true;
|
||||
} else {
|
||||
RCU_TRACE(trace_rcu_invoke_callback(rn, head));
|
||||
head->func(head);
|
||||
rcu_lock_release(&rcu_callback_map);
|
||||
return 0;
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -298,9 +298,9 @@ int __srcu_read_lock(struct srcu_struct *sp)
|
|||
|
||||
idx = ACCESS_ONCE(sp->completed) & 0x1;
|
||||
preempt_disable();
|
||||
ACCESS_ONCE(this_cpu_ptr(sp->per_cpu_ref)->c[idx]) += 1;
|
||||
__this_cpu_inc(sp->per_cpu_ref->c[idx]);
|
||||
smp_mb(); /* B */ /* Avoid leaking the critical section. */
|
||||
ACCESS_ONCE(this_cpu_ptr(sp->per_cpu_ref)->seq[idx]) += 1;
|
||||
__this_cpu_inc(sp->per_cpu_ref->seq[idx]);
|
||||
preempt_enable();
|
||||
return idx;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1013,10 +1013,7 @@ static void record_gp_stall_check_time(struct rcu_state *rsp)
|
|||
}
|
||||
|
||||
/*
|
||||
* Dump stacks of all tasks running on stalled CPUs. This is a fallback
|
||||
* for architectures that do not implement trigger_all_cpu_backtrace().
|
||||
* The NMI-triggered stack traces are more accurate because they are
|
||||
* printed by the target CPU.
|
||||
* Dump stacks of all tasks running on stalled CPUs.
|
||||
*/
|
||||
static void rcu_dump_cpu_stacks(struct rcu_state *rsp)
|
||||
{
|
||||
|
|
@ -1094,7 +1091,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
|
|||
(long)rsp->gpnum, (long)rsp->completed, totqlen);
|
||||
if (ndetected == 0)
|
||||
pr_err("INFO: Stall ended before state dump start\n");
|
||||
else if (!trigger_all_cpu_backtrace())
|
||||
else
|
||||
rcu_dump_cpu_stacks(rsp);
|
||||
|
||||
/* Complain about tasks blocking the grace period. */
|
||||
|
|
@ -1125,8 +1122,7 @@ static void print_cpu_stall(struct rcu_state *rsp)
|
|||
pr_cont(" (t=%lu jiffies g=%ld c=%ld q=%lu)\n",
|
||||
jiffies - rsp->gp_start,
|
||||
(long)rsp->gpnum, (long)rsp->completed, totqlen);
|
||||
if (!trigger_all_cpu_backtrace())
|
||||
dump_stack();
|
||||
rcu_dump_cpu_stacks(rsp);
|
||||
|
||||
raw_spin_lock_irqsave(&rnp->lock, flags);
|
||||
if (ULONG_CMP_GE(jiffies, ACCESS_ONCE(rsp->jiffies_stall)))
|
||||
|
|
@ -1305,10 +1301,16 @@ rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp,
|
|||
* believe that a grace period is in progress, then we must wait
|
||||
* for the one following, which is in "c". Because our request
|
||||
* will be noticed at the end of the current grace period, we don't
|
||||
* need to explicitly start one.
|
||||
* need to explicitly start one. We only do the lockless check
|
||||
* of rnp_root's fields if the current rcu_node structure thinks
|
||||
* there is no grace period in flight, and because we hold rnp->lock,
|
||||
* the only possible change is when rnp_root's two fields are
|
||||
* equal, in which case rnp_root->gpnum might be concurrently
|
||||
* incremented. But that is OK, as it will just result in our
|
||||
* doing some extra useless work.
|
||||
*/
|
||||
if (rnp->gpnum != rnp->completed ||
|
||||
ACCESS_ONCE(rnp->gpnum) != ACCESS_ONCE(rnp->completed)) {
|
||||
ACCESS_ONCE(rnp_root->gpnum) != ACCESS_ONCE(rnp_root->completed)) {
|
||||
rnp->need_future_gp[c & 0x1]++;
|
||||
trace_rcu_future_gp(rnp, rdp, c, TPS("Startedleaf"));
|
||||
goto out;
|
||||
|
|
@ -1645,11 +1647,6 @@ static int rcu_gp_init(struct rcu_state *rsp)
|
|||
rnp->level, rnp->grplo,
|
||||
rnp->grphi, rnp->qsmask);
|
||||
raw_spin_unlock_irq(&rnp->lock);
|
||||
#ifdef CONFIG_PROVE_RCU_DELAY
|
||||
if ((prandom_u32() % (rcu_num_nodes + 1)) == 0 &&
|
||||
system_state == SYSTEM_RUNNING)
|
||||
udelay(200);
|
||||
#endif /* #ifdef CONFIG_PROVE_RCU_DELAY */
|
||||
cond_resched();
|
||||
}
|
||||
|
||||
|
|
@ -2347,7 +2344,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
|
|||
}
|
||||
smp_mb(); /* List handling before counting for rcu_barrier(). */
|
||||
rdp->qlen_lazy -= count_lazy;
|
||||
ACCESS_ONCE(rdp->qlen) -= count;
|
||||
ACCESS_ONCE(rdp->qlen) = rdp->qlen - count;
|
||||
rdp->n_cbs_invoked += count;
|
||||
|
||||
/* Reinstate batch limit if we have worked down the excess. */
|
||||
|
|
@ -2485,14 +2482,14 @@ static void force_quiescent_state(struct rcu_state *rsp)
|
|||
struct rcu_node *rnp_old = NULL;
|
||||
|
||||
/* Funnel through hierarchy to reduce memory contention. */
|
||||
rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
|
||||
rnp = __this_cpu_read(rsp->rda->mynode);
|
||||
for (; rnp != NULL; rnp = rnp->parent) {
|
||||
ret = (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) ||
|
||||
!raw_spin_trylock(&rnp->fqslock);
|
||||
if (rnp_old != NULL)
|
||||
raw_spin_unlock(&rnp_old->fqslock);
|
||||
if (ret) {
|
||||
ACCESS_ONCE(rsp->n_force_qs_lh)++;
|
||||
rsp->n_force_qs_lh++;
|
||||
return;
|
||||
}
|
||||
rnp_old = rnp;
|
||||
|
|
@ -2504,7 +2501,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
|
|||
smp_mb__after_unlock_lock();
|
||||
raw_spin_unlock(&rnp_old->fqslock);
|
||||
if (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) {
|
||||
ACCESS_ONCE(rsp->n_force_qs_lh)++;
|
||||
rsp->n_force_qs_lh++;
|
||||
raw_spin_unlock_irqrestore(&rnp_old->lock, flags);
|
||||
return; /* Someone beat us to it. */
|
||||
}
|
||||
|
|
@ -2662,7 +2659,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
|
|||
unsigned long flags;
|
||||
struct rcu_data *rdp;
|
||||
|
||||
WARN_ON_ONCE((unsigned long)head & 0x3); /* Misaligned rcu_head! */
|
||||
WARN_ON_ONCE((unsigned long)head & 0x1); /* Misaligned rcu_head! */
|
||||
if (debug_rcu_head_queue(head)) {
|
||||
/* Probable double call_rcu(), so leak the callback. */
|
||||
ACCESS_ONCE(head->func) = rcu_leak_callback;
|
||||
|
|
@ -2693,7 +2690,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
|
|||
local_irq_restore(flags);
|
||||
return;
|
||||
}
|
||||
ACCESS_ONCE(rdp->qlen)++;
|
||||
ACCESS_ONCE(rdp->qlen) = rdp->qlen + 1;
|
||||
if (lazy)
|
||||
rdp->qlen_lazy++;
|
||||
else
|
||||
|
|
@ -3257,7 +3254,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
|
|||
* ACCESS_ONCE() to prevent the compiler from speculating
|
||||
* the increment to precede the early-exit check.
|
||||
*/
|
||||
ACCESS_ONCE(rsp->n_barrier_done)++;
|
||||
ACCESS_ONCE(rsp->n_barrier_done) = rsp->n_barrier_done + 1;
|
||||
WARN_ON_ONCE((rsp->n_barrier_done & 0x1) != 1);
|
||||
_rcu_barrier_trace(rsp, "Inc1", -1, rsp->n_barrier_done);
|
||||
smp_mb(); /* Order ->n_barrier_done increment with below mechanism. */
|
||||
|
|
@ -3307,7 +3304,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
|
|||
|
||||
/* Increment ->n_barrier_done to prevent duplicate work. */
|
||||
smp_mb(); /* Keep increment after above mechanism. */
|
||||
ACCESS_ONCE(rsp->n_barrier_done)++;
|
||||
ACCESS_ONCE(rsp->n_barrier_done) = rsp->n_barrier_done + 1;
|
||||
WARN_ON_ONCE((rsp->n_barrier_done & 0x1) != 0);
|
||||
_rcu_barrier_trace(rsp, "Inc2", -1, rsp->n_barrier_done);
|
||||
smp_mb(); /* Keep increment before caller's subsequent code. */
|
||||
|
|
@ -3564,14 +3561,16 @@ static void __init rcu_init_levelspread(struct rcu_state *rsp)
|
|||
static void __init rcu_init_one(struct rcu_state *rsp,
|
||||
struct rcu_data __percpu *rda)
|
||||
{
|
||||
static char *buf[] = { "rcu_node_0",
|
||||
"rcu_node_1",
|
||||
"rcu_node_2",
|
||||
"rcu_node_3" }; /* Match MAX_RCU_LVLS */
|
||||
static char *fqs[] = { "rcu_node_fqs_0",
|
||||
"rcu_node_fqs_1",
|
||||
"rcu_node_fqs_2",
|
||||
"rcu_node_fqs_3" }; /* Match MAX_RCU_LVLS */
|
||||
static const char * const buf[] = {
|
||||
"rcu_node_0",
|
||||
"rcu_node_1",
|
||||
"rcu_node_2",
|
||||
"rcu_node_3" }; /* Match MAX_RCU_LVLS */
|
||||
static const char * const fqs[] = {
|
||||
"rcu_node_fqs_0",
|
||||
"rcu_node_fqs_1",
|
||||
"rcu_node_fqs_2",
|
||||
"rcu_node_fqs_3" }; /* Match MAX_RCU_LVLS */
|
||||
static u8 fl_mask = 0x1;
|
||||
int cpustride = 1;
|
||||
int i;
|
||||
|
|
|
|||
|
|
@ -172,6 +172,14 @@ struct rcu_node {
|
|||
/* queued on this rcu_node structure that */
|
||||
/* are blocking the current grace period, */
|
||||
/* there can be no such task. */
|
||||
struct completion boost_completion;
|
||||
/* Used to ensure that the rt_mutex used */
|
||||
/* to carry out the boosting is fully */
|
||||
/* released with no future boostee accesses */
|
||||
/* before that rt_mutex is re-initialized. */
|
||||
struct rt_mutex boost_mtx;
|
||||
/* Used only for the priority-boosting */
|
||||
/* side effect, not as a lock. */
|
||||
unsigned long boost_time;
|
||||
/* When to start boosting (jiffies). */
|
||||
struct task_struct *boost_kthread_task;
|
||||
|
|
@ -334,11 +342,29 @@ struct rcu_data {
|
|||
struct rcu_head **nocb_tail;
|
||||
atomic_long_t nocb_q_count; /* # CBs waiting for kthread */
|
||||
atomic_long_t nocb_q_count_lazy; /* (approximate). */
|
||||
struct rcu_head *nocb_follower_head; /* CBs ready to invoke. */
|
||||
struct rcu_head **nocb_follower_tail;
|
||||
atomic_long_t nocb_follower_count; /* # CBs ready to invoke. */
|
||||
atomic_long_t nocb_follower_count_lazy; /* (approximate). */
|
||||
int nocb_p_count; /* # CBs being invoked by kthread */
|
||||
int nocb_p_count_lazy; /* (approximate). */
|
||||
wait_queue_head_t nocb_wq; /* For nocb kthreads to sleep on. */
|
||||
struct task_struct *nocb_kthread;
|
||||
bool nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */
|
||||
|
||||
/* The following fields are used by the leader, hence own cacheline. */
|
||||
struct rcu_head *nocb_gp_head ____cacheline_internodealigned_in_smp;
|
||||
/* CBs waiting for GP. */
|
||||
struct rcu_head **nocb_gp_tail;
|
||||
long nocb_gp_count;
|
||||
long nocb_gp_count_lazy;
|
||||
bool nocb_leader_wake; /* Is the nocb leader thread awake? */
|
||||
struct rcu_data *nocb_next_follower;
|
||||
/* Next follower in wakeup chain. */
|
||||
|
||||
/* The following fields are used by the follower, hence new cachline. */
|
||||
struct rcu_data *nocb_leader ____cacheline_internodealigned_in_smp;
|
||||
/* Leader CPU takes GP-end wakeups. */
|
||||
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */
|
||||
|
||||
/* 8) RCU CPU stall data. */
|
||||
|
|
@ -587,8 +613,14 @@ static bool rcu_nohz_full_cpu(struct rcu_state *rsp);
|
|||
/* Sum up queue lengths for tracing. */
|
||||
static inline void rcu_nocb_q_lengths(struct rcu_data *rdp, long *ql, long *qll)
|
||||
{
|
||||
*ql = atomic_long_read(&rdp->nocb_q_count) + rdp->nocb_p_count;
|
||||
*qll = atomic_long_read(&rdp->nocb_q_count_lazy) + rdp->nocb_p_count_lazy;
|
||||
*ql = atomic_long_read(&rdp->nocb_q_count) +
|
||||
rdp->nocb_p_count +
|
||||
atomic_long_read(&rdp->nocb_follower_count) +
|
||||
rdp->nocb_p_count + rdp->nocb_gp_count;
|
||||
*qll = atomic_long_read(&rdp->nocb_q_count_lazy) +
|
||||
rdp->nocb_p_count_lazy +
|
||||
atomic_long_read(&rdp->nocb_follower_count_lazy) +
|
||||
rdp->nocb_p_count_lazy + rdp->nocb_gp_count_lazy;
|
||||
}
|
||||
#else /* #ifdef CONFIG_RCU_NOCB_CPU */
|
||||
static inline void rcu_nocb_q_lengths(struct rcu_data *rdp, long *ql, long *qll)
|
||||
|
|
|
|||
|
|
@ -33,6 +33,7 @@
|
|||
#define RCU_KTHREAD_PRIO 1
|
||||
|
||||
#ifdef CONFIG_RCU_BOOST
|
||||
#include "../locking/rtmutex_common.h"
|
||||
#define RCU_BOOST_PRIO CONFIG_RCU_BOOST_PRIO
|
||||
#else
|
||||
#define RCU_BOOST_PRIO RCU_KTHREAD_PRIO
|
||||
|
|
@ -336,7 +337,7 @@ void rcu_read_unlock_special(struct task_struct *t)
|
|||
unsigned long flags;
|
||||
struct list_head *np;
|
||||
#ifdef CONFIG_RCU_BOOST
|
||||
struct rt_mutex *rbmp = NULL;
|
||||
bool drop_boost_mutex = false;
|
||||
#endif /* #ifdef CONFIG_RCU_BOOST */
|
||||
struct rcu_node *rnp;
|
||||
int special;
|
||||
|
|
@ -398,11 +399,8 @@ void rcu_read_unlock_special(struct task_struct *t)
|
|||
#ifdef CONFIG_RCU_BOOST
|
||||
if (&t->rcu_node_entry == rnp->boost_tasks)
|
||||
rnp->boost_tasks = np;
|
||||
/* Snapshot/clear ->rcu_boost_mutex with rcu_node lock held. */
|
||||
if (t->rcu_boost_mutex) {
|
||||
rbmp = t->rcu_boost_mutex;
|
||||
t->rcu_boost_mutex = NULL;
|
||||
}
|
||||
/* Snapshot ->boost_mtx ownership with rcu_node lock held. */
|
||||
drop_boost_mutex = rt_mutex_owner(&rnp->boost_mtx) == t;
|
||||
#endif /* #ifdef CONFIG_RCU_BOOST */
|
||||
|
||||
/*
|
||||
|
|
@ -427,8 +425,10 @@ void rcu_read_unlock_special(struct task_struct *t)
|
|||
|
||||
#ifdef CONFIG_RCU_BOOST
|
||||
/* Unboost if we were boosted. */
|
||||
if (rbmp)
|
||||
rt_mutex_unlock(rbmp);
|
||||
if (drop_boost_mutex) {
|
||||
rt_mutex_unlock(&rnp->boost_mtx);
|
||||
complete(&rnp->boost_completion);
|
||||
}
|
||||
#endif /* #ifdef CONFIG_RCU_BOOST */
|
||||
|
||||
/*
|
||||
|
|
@ -988,6 +988,7 @@ static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp)
|
|||
|
||||
/* Because preemptible RCU does not exist, no quieting of tasks. */
|
||||
static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, unsigned long flags)
|
||||
__releases(rnp->lock)
|
||||
{
|
||||
raw_spin_unlock_irqrestore(&rnp->lock, flags);
|
||||
}
|
||||
|
|
@ -1149,7 +1150,6 @@ static void rcu_wake_cond(struct task_struct *t, int status)
|
|||
static int rcu_boost(struct rcu_node *rnp)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct rt_mutex mtx;
|
||||
struct task_struct *t;
|
||||
struct list_head *tb;
|
||||
|
||||
|
|
@ -1200,11 +1200,15 @@ static int rcu_boost(struct rcu_node *rnp)
|
|||
* section.
|
||||
*/
|
||||
t = container_of(tb, struct task_struct, rcu_node_entry);
|
||||
rt_mutex_init_proxy_locked(&mtx, t);
|
||||
t->rcu_boost_mutex = &mtx;
|
||||
rt_mutex_init_proxy_locked(&rnp->boost_mtx, t);
|
||||
init_completion(&rnp->boost_completion);
|
||||
raw_spin_unlock_irqrestore(&rnp->lock, flags);
|
||||
rt_mutex_lock(&mtx); /* Side effect: boosts task t's priority. */
|
||||
rt_mutex_unlock(&mtx); /* Keep lockdep happy. */
|
||||
/* Lock only for side effect: boosts task t's priority. */
|
||||
rt_mutex_lock(&rnp->boost_mtx);
|
||||
rt_mutex_unlock(&rnp->boost_mtx); /* Then keep lockdep happy. */
|
||||
|
||||
/* Wait for boostee to be done w/boost_mtx before reinitializing. */
|
||||
wait_for_completion(&rnp->boost_completion);
|
||||
|
||||
return ACCESS_ONCE(rnp->exp_tasks) != NULL ||
|
||||
ACCESS_ONCE(rnp->boost_tasks) != NULL;
|
||||
|
|
@ -1256,6 +1260,7 @@ static int rcu_boost_kthread(void *arg)
|
|||
* about it going away.
|
||||
*/
|
||||
static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
|
||||
__releases(rnp->lock)
|
||||
{
|
||||
struct task_struct *t;
|
||||
|
||||
|
|
@ -1491,6 +1496,7 @@ static void rcu_prepare_kthreads(int cpu)
|
|||
#else /* #ifdef CONFIG_RCU_BOOST */
|
||||
|
||||
static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
|
||||
__releases(rnp->lock)
|
||||
{
|
||||
raw_spin_unlock_irqrestore(&rnp->lock, flags);
|
||||
}
|
||||
|
|
@ -2059,6 +2065,22 @@ bool rcu_is_nocb_cpu(int cpu)
|
|||
}
|
||||
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
|
||||
|
||||
/*
|
||||
* Kick the leader kthread for this NOCB group.
|
||||
*/
|
||||
static void wake_nocb_leader(struct rcu_data *rdp, bool force)
|
||||
{
|
||||
struct rcu_data *rdp_leader = rdp->nocb_leader;
|
||||
|
||||
if (!ACCESS_ONCE(rdp_leader->nocb_kthread))
|
||||
return;
|
||||
if (!ACCESS_ONCE(rdp_leader->nocb_leader_wake) || force) {
|
||||
/* Prior xchg orders against prior callback enqueue. */
|
||||
ACCESS_ONCE(rdp_leader->nocb_leader_wake) = true;
|
||||
wake_up(&rdp_leader->nocb_wq);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Enqueue the specified string of rcu_head structures onto the specified
|
||||
* CPU's no-CBs lists. The CPU is specified by rdp, the head of the
|
||||
|
|
@ -2093,7 +2115,8 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
|
|||
len = atomic_long_read(&rdp->nocb_q_count);
|
||||
if (old_rhpp == &rdp->nocb_head) {
|
||||
if (!irqs_disabled_flags(flags)) {
|
||||
wake_up(&rdp->nocb_wq); /* ... if queue was empty ... */
|
||||
/* ... if queue was empty ... */
|
||||
wake_nocb_leader(rdp, false);
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
TPS("WakeEmpty"));
|
||||
} else {
|
||||
|
|
@ -2103,7 +2126,8 @@ static void __call_rcu_nocb_enqueue(struct rcu_data *rdp,
|
|||
}
|
||||
rdp->qlen_last_fqs_check = 0;
|
||||
} else if (len > rdp->qlen_last_fqs_check + qhimark) {
|
||||
wake_up_process(t); /* ... or if many callbacks queued. */
|
||||
/* ... or if many callbacks queued. */
|
||||
wake_nocb_leader(rdp, true);
|
||||
rdp->qlen_last_fqs_check = LONG_MAX / 2;
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("WakeOvf"));
|
||||
} else {
|
||||
|
|
@ -2212,14 +2236,151 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
|
|||
smp_mb(); /* Ensure that CB invocation happens after GP end. */
|
||||
}
|
||||
|
||||
/*
|
||||
* Leaders come here to wait for additional callbacks to show up.
|
||||
* This function does not return until callbacks appear.
|
||||
*/
|
||||
static void nocb_leader_wait(struct rcu_data *my_rdp)
|
||||
{
|
||||
bool firsttime = true;
|
||||
bool gotcbs;
|
||||
struct rcu_data *rdp;
|
||||
struct rcu_head **tail;
|
||||
|
||||
wait_again:
|
||||
|
||||
/* Wait for callbacks to appear. */
|
||||
if (!rcu_nocb_poll) {
|
||||
trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, "Sleep");
|
||||
wait_event_interruptible(my_rdp->nocb_wq,
|
||||
ACCESS_ONCE(my_rdp->nocb_leader_wake));
|
||||
/* Memory barrier handled by smp_mb() calls below and repoll. */
|
||||
} else if (firsttime) {
|
||||
firsttime = false; /* Don't drown trace log with "Poll"! */
|
||||
trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, "Poll");
|
||||
}
|
||||
|
||||
/*
|
||||
* Each pass through the following loop checks a follower for CBs.
|
||||
* We are our own first follower. Any CBs found are moved to
|
||||
* nocb_gp_head, where they await a grace period.
|
||||
*/
|
||||
gotcbs = false;
|
||||
for (rdp = my_rdp; rdp; rdp = rdp->nocb_next_follower) {
|
||||
rdp->nocb_gp_head = ACCESS_ONCE(rdp->nocb_head);
|
||||
if (!rdp->nocb_gp_head)
|
||||
continue; /* No CBs here, try next follower. */
|
||||
|
||||
/* Move callbacks to wait-for-GP list, which is empty. */
|
||||
ACCESS_ONCE(rdp->nocb_head) = NULL;
|
||||
rdp->nocb_gp_tail = xchg(&rdp->nocb_tail, &rdp->nocb_head);
|
||||
rdp->nocb_gp_count = atomic_long_xchg(&rdp->nocb_q_count, 0);
|
||||
rdp->nocb_gp_count_lazy =
|
||||
atomic_long_xchg(&rdp->nocb_q_count_lazy, 0);
|
||||
gotcbs = true;
|
||||
}
|
||||
|
||||
/*
|
||||
* If there were no callbacks, sleep a bit, rescan after a
|
||||
* memory barrier, and go retry.
|
||||
*/
|
||||
if (unlikely(!gotcbs)) {
|
||||
if (!rcu_nocb_poll)
|
||||
trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu,
|
||||
"WokeEmpty");
|
||||
flush_signals(current);
|
||||
schedule_timeout_interruptible(1);
|
||||
|
||||
/* Rescan in case we were a victim of memory ordering. */
|
||||
my_rdp->nocb_leader_wake = false;
|
||||
smp_mb(); /* Ensure _wake false before scan. */
|
||||
for (rdp = my_rdp; rdp; rdp = rdp->nocb_next_follower)
|
||||
if (ACCESS_ONCE(rdp->nocb_head)) {
|
||||
/* Found CB, so short-circuit next wait. */
|
||||
my_rdp->nocb_leader_wake = true;
|
||||
break;
|
||||
}
|
||||
goto wait_again;
|
||||
}
|
||||
|
||||
/* Wait for one grace period. */
|
||||
rcu_nocb_wait_gp(my_rdp);
|
||||
|
||||
/*
|
||||
* We left ->nocb_leader_wake set to reduce cache thrashing.
|
||||
* We clear it now, but recheck for new callbacks while
|
||||
* traversing our follower list.
|
||||
*/
|
||||
my_rdp->nocb_leader_wake = false;
|
||||
smp_mb(); /* Ensure _wake false before scan of ->nocb_head. */
|
||||
|
||||
/* Each pass through the following loop wakes a follower, if needed. */
|
||||
for (rdp = my_rdp; rdp; rdp = rdp->nocb_next_follower) {
|
||||
if (ACCESS_ONCE(rdp->nocb_head))
|
||||
my_rdp->nocb_leader_wake = true; /* No need to wait. */
|
||||
if (!rdp->nocb_gp_head)
|
||||
continue; /* No CBs, so no need to wake follower. */
|
||||
|
||||
/* Append callbacks to follower's "done" list. */
|
||||
tail = xchg(&rdp->nocb_follower_tail, rdp->nocb_gp_tail);
|
||||
*tail = rdp->nocb_gp_head;
|
||||
atomic_long_add(rdp->nocb_gp_count, &rdp->nocb_follower_count);
|
||||
atomic_long_add(rdp->nocb_gp_count_lazy,
|
||||
&rdp->nocb_follower_count_lazy);
|
||||
if (rdp != my_rdp && tail == &rdp->nocb_follower_head) {
|
||||
/*
|
||||
* List was empty, wake up the follower.
|
||||
* Memory barriers supplied by atomic_long_add().
|
||||
*/
|
||||
wake_up(&rdp->nocb_wq);
|
||||
}
|
||||
}
|
||||
|
||||
/* If we (the leader) don't have CBs, go wait some more. */
|
||||
if (!my_rdp->nocb_follower_head)
|
||||
goto wait_again;
|
||||
}
|
||||
|
||||
/*
|
||||
* Followers come here to wait for additional callbacks to show up.
|
||||
* This function does not return until callbacks appear.
|
||||
*/
|
||||
static void nocb_follower_wait(struct rcu_data *rdp)
|
||||
{
|
||||
bool firsttime = true;
|
||||
|
||||
for (;;) {
|
||||
if (!rcu_nocb_poll) {
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
"FollowerSleep");
|
||||
wait_event_interruptible(rdp->nocb_wq,
|
||||
ACCESS_ONCE(rdp->nocb_follower_head));
|
||||
} else if (firsttime) {
|
||||
/* Don't drown trace log with "Poll"! */
|
||||
firsttime = false;
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, "Poll");
|
||||
}
|
||||
if (smp_load_acquire(&rdp->nocb_follower_head)) {
|
||||
/* ^^^ Ensure CB invocation follows _head test. */
|
||||
return;
|
||||
}
|
||||
if (!rcu_nocb_poll)
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
"WokeEmpty");
|
||||
flush_signals(current);
|
||||
schedule_timeout_interruptible(1);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Per-rcu_data kthread, but only for no-CBs CPUs. Each kthread invokes
|
||||
* callbacks queued by the corresponding no-CBs CPU.
|
||||
* callbacks queued by the corresponding no-CBs CPU, however, there is
|
||||
* an optional leader-follower relationship so that the grace-period
|
||||
* kthreads don't have to do quite so many wakeups.
|
||||
*/
|
||||
static int rcu_nocb_kthread(void *arg)
|
||||
{
|
||||
int c, cl;
|
||||
bool firsttime = 1;
|
||||
struct rcu_head *list;
|
||||
struct rcu_head *next;
|
||||
struct rcu_head **tail;
|
||||
|
|
@ -2227,41 +2388,22 @@ static int rcu_nocb_kthread(void *arg)
|
|||
|
||||
/* Each pass through this loop invokes one batch of callbacks */
|
||||
for (;;) {
|
||||
/* If not polling, wait for next batch of callbacks. */
|
||||
if (!rcu_nocb_poll) {
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
TPS("Sleep"));
|
||||
wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
|
||||
/* Memory barrier provide by xchg() below. */
|
||||
} else if (firsttime) {
|
||||
firsttime = 0;
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
TPS("Poll"));
|
||||
}
|
||||
list = ACCESS_ONCE(rdp->nocb_head);
|
||||
if (!list) {
|
||||
if (!rcu_nocb_poll)
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
TPS("WokeEmpty"));
|
||||
schedule_timeout_interruptible(1);
|
||||
flush_signals(current);
|
||||
continue;
|
||||
}
|
||||
firsttime = 1;
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
|
||||
TPS("WokeNonEmpty"));
|
||||
/* Wait for callbacks. */
|
||||
if (rdp->nocb_leader == rdp)
|
||||
nocb_leader_wait(rdp);
|
||||
else
|
||||
nocb_follower_wait(rdp);
|
||||
|
||||
/*
|
||||
* Extract queued callbacks, update counts, and wait
|
||||
* for a grace period to elapse.
|
||||
*/
|
||||
ACCESS_ONCE(rdp->nocb_head) = NULL;
|
||||
tail = xchg(&rdp->nocb_tail, &rdp->nocb_head);
|
||||
c = atomic_long_xchg(&rdp->nocb_q_count, 0);
|
||||
cl = atomic_long_xchg(&rdp->nocb_q_count_lazy, 0);
|
||||
ACCESS_ONCE(rdp->nocb_p_count) += c;
|
||||
ACCESS_ONCE(rdp->nocb_p_count_lazy) += cl;
|
||||
rcu_nocb_wait_gp(rdp);
|
||||
/* Pull the ready-to-invoke callbacks onto local list. */
|
||||
list = ACCESS_ONCE(rdp->nocb_follower_head);
|
||||
BUG_ON(!list);
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, "WokeNonEmpty");
|
||||
ACCESS_ONCE(rdp->nocb_follower_head) = NULL;
|
||||
tail = xchg(&rdp->nocb_follower_tail, &rdp->nocb_follower_head);
|
||||
c = atomic_long_xchg(&rdp->nocb_follower_count, 0);
|
||||
cl = atomic_long_xchg(&rdp->nocb_follower_count_lazy, 0);
|
||||
rdp->nocb_p_count += c;
|
||||
rdp->nocb_p_count_lazy += cl;
|
||||
|
||||
/* Each pass through the following loop invokes a callback. */
|
||||
trace_rcu_batch_start(rdp->rsp->name, cl, c, -1);
|
||||
|
|
@ -2305,7 +2447,7 @@ static void do_nocb_deferred_wakeup(struct rcu_data *rdp)
|
|||
if (!rcu_nocb_need_deferred_wakeup(rdp))
|
||||
return;
|
||||
ACCESS_ONCE(rdp->nocb_defer_wakeup) = false;
|
||||
wake_up(&rdp->nocb_wq);
|
||||
wake_nocb_leader(rdp, false);
|
||||
trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, TPS("DeferredWakeEmpty"));
|
||||
}
|
||||
|
||||
|
|
@ -2314,19 +2456,57 @@ static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
|
|||
{
|
||||
rdp->nocb_tail = &rdp->nocb_head;
|
||||
init_waitqueue_head(&rdp->nocb_wq);
|
||||
rdp->nocb_follower_tail = &rdp->nocb_follower_head;
|
||||
}
|
||||
|
||||
/* Create a kthread for each RCU flavor for each no-CBs CPU. */
|
||||
/* How many follower CPU IDs per leader? Default of -1 for sqrt(nr_cpu_ids). */
|
||||
static int rcu_nocb_leader_stride = -1;
|
||||
module_param(rcu_nocb_leader_stride, int, 0444);
|
||||
|
||||
/*
|
||||
* Create a kthread for each RCU flavor for each no-CBs CPU.
|
||||
* Also initialize leader-follower relationships.
|
||||
*/
|
||||
static void __init rcu_spawn_nocb_kthreads(struct rcu_state *rsp)
|
||||
{
|
||||
int cpu;
|
||||
int ls = rcu_nocb_leader_stride;
|
||||
int nl = 0; /* Next leader. */
|
||||
struct rcu_data *rdp;
|
||||
struct rcu_data *rdp_leader = NULL; /* Suppress misguided gcc warn. */
|
||||
struct rcu_data *rdp_prev = NULL;
|
||||
struct task_struct *t;
|
||||
|
||||
if (rcu_nocb_mask == NULL)
|
||||
return;
|
||||
#if defined(CONFIG_NO_HZ_FULL) && !defined(CONFIG_NO_HZ_FULL_ALL)
|
||||
if (tick_nohz_full_running)
|
||||
cpumask_or(rcu_nocb_mask, rcu_nocb_mask, tick_nohz_full_mask);
|
||||
#endif /* #if defined(CONFIG_NO_HZ_FULL) && !defined(CONFIG_NO_HZ_FULL_ALL) */
|
||||
if (ls == -1) {
|
||||
ls = int_sqrt(nr_cpu_ids);
|
||||
rcu_nocb_leader_stride = ls;
|
||||
}
|
||||
|
||||
/*
|
||||
* Each pass through this loop sets up one rcu_data structure and
|
||||
* spawns one rcu_nocb_kthread().
|
||||
*/
|
||||
for_each_cpu(cpu, rcu_nocb_mask) {
|
||||
rdp = per_cpu_ptr(rsp->rda, cpu);
|
||||
if (rdp->cpu >= nl) {
|
||||
/* New leader, set up for followers & next leader. */
|
||||
nl = DIV_ROUND_UP(rdp->cpu + 1, ls) * ls;
|
||||
rdp->nocb_leader = rdp;
|
||||
rdp_leader = rdp;
|
||||
} else {
|
||||
/* Another follower, link to previous leader. */
|
||||
rdp->nocb_leader = rdp_leader;
|
||||
rdp_prev->nocb_next_follower = rdp;
|
||||
}
|
||||
rdp_prev = rdp;
|
||||
|
||||
/* Spawn the kthread for this CPU. */
|
||||
t = kthread_run(rcu_nocb_kthread, rdp,
|
||||
"rcuo%c/%d", rsp->abbr, cpu);
|
||||
BUG_ON(IS_ERR(t));
|
||||
|
|
@ -2843,12 +3023,16 @@ static bool rcu_nohz_full_cpu(struct rcu_state *rsp)
|
|||
*/
|
||||
static void rcu_bind_gp_kthread(void)
|
||||
{
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
int cpu = ACCESS_ONCE(tick_do_timer_cpu);
|
||||
int __maybe_unused cpu;
|
||||
|
||||
if (cpu < 0 || cpu >= nr_cpu_ids)
|
||||
if (!tick_nohz_full_enabled())
|
||||
return;
|
||||
if (raw_smp_processor_id() != cpu)
|
||||
#ifdef CONFIG_NO_HZ_FULL_SYSIDLE
|
||||
cpu = tick_do_timer_cpu;
|
||||
if (cpu >= 0 && cpu < nr_cpu_ids && raw_smp_processor_id() != cpu)
|
||||
set_cpus_allowed_ptr(current, cpumask_of(cpu));
|
||||
#endif /* #ifdef CONFIG_NO_HZ_FULL */
|
||||
#else /* #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
|
||||
if (!is_housekeeping_cpu(raw_smp_processor_id()))
|
||||
housekeeping_affine(current);
|
||||
#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
|
||||
}
|
||||
|
|
|
|||
|
|
@ -90,9 +90,6 @@ void __rcu_read_unlock(void)
|
|||
} else {
|
||||
barrier(); /* critical section before exit code. */
|
||||
t->rcu_read_lock_nesting = INT_MIN;
|
||||
#ifdef CONFIG_PROVE_RCU_DELAY
|
||||
udelay(10); /* Make preemption more probable. */
|
||||
#endif /* #ifdef CONFIG_PROVE_RCU_DELAY */
|
||||
barrier(); /* assign before ->rcu_read_unlock_special load */
|
||||
if (unlikely(ACCESS_ONCE(t->rcu_read_unlock_special)))
|
||||
rcu_read_unlock_special(t);
|
||||
|
|
|
|||
|
|
@ -1263,6 +1263,10 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
|
|||
struct sighand_struct *sighand;
|
||||
|
||||
for (;;) {
|
||||
/*
|
||||
* Disable interrupts early to avoid deadlocks.
|
||||
* See rcu_read_unlock() comment header for details.
|
||||
*/
|
||||
local_irq_save(*flags);
|
||||
rcu_read_lock();
|
||||
sighand = rcu_dereference(tsk->sighand);
|
||||
|
|
|
|||
|
|
@ -154,6 +154,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
|
|||
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
cpumask_var_t tick_nohz_full_mask;
|
||||
cpumask_var_t housekeeping_mask;
|
||||
bool tick_nohz_full_running;
|
||||
|
||||
static bool can_stop_full_tick(void)
|
||||
|
|
@ -281,6 +282,7 @@ static int __init tick_nohz_full_setup(char *str)
|
|||
int cpu;
|
||||
|
||||
alloc_bootmem_cpumask_var(&tick_nohz_full_mask);
|
||||
alloc_bootmem_cpumask_var(&housekeeping_mask);
|
||||
if (cpulist_parse(str, tick_nohz_full_mask) < 0) {
|
||||
pr_warning("NOHZ: Incorrect nohz_full cpumask\n");
|
||||
return 1;
|
||||
|
|
@ -291,6 +293,8 @@ static int __init tick_nohz_full_setup(char *str)
|
|||
pr_warning("NO_HZ: Clearing %d from nohz_full range for timekeeping\n", cpu);
|
||||
cpumask_clear_cpu(cpu, tick_nohz_full_mask);
|
||||
}
|
||||
cpumask_andnot(housekeeping_mask,
|
||||
cpu_possible_mask, tick_nohz_full_mask);
|
||||
tick_nohz_full_running = true;
|
||||
|
||||
return 1;
|
||||
|
|
@ -332,9 +336,15 @@ static int tick_nohz_init_all(void)
|
|||
pr_err("NO_HZ: Can't allocate full dynticks cpumask\n");
|
||||
return err;
|
||||
}
|
||||
if (!alloc_cpumask_var(&housekeeping_mask, GFP_KERNEL)) {
|
||||
pr_err("NO_HZ: Can't allocate not-full dynticks cpumask\n");
|
||||
return err;
|
||||
}
|
||||
err = 0;
|
||||
cpumask_setall(tick_nohz_full_mask);
|
||||
cpumask_clear_cpu(smp_processor_id(), tick_nohz_full_mask);
|
||||
cpumask_clear(housekeeping_mask);
|
||||
cpumask_set_cpu(smp_processor_id(), housekeeping_mask);
|
||||
tick_nohz_full_running = true;
|
||||
#endif
|
||||
return err;
|
||||
|
|
|
|||
|
|
@ -708,7 +708,7 @@ int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
|
|||
int ret = 0;
|
||||
|
||||
VERBOSE_TOROUT_STRING(m);
|
||||
*tp = kthread_run(fn, arg, s);
|
||||
*tp = kthread_run(fn, arg, "%s", s);
|
||||
if (IS_ERR(*tp)) {
|
||||
ret = PTR_ERR(*tp);
|
||||
VERBOSE_TOROUT_ERRSTRING(f);
|
||||
|
|
|
|||
|
|
@ -1131,20 +1131,6 @@ config PROVE_RCU_REPEATEDLY
|
|||
|
||||
Say N if you are unsure.
|
||||
|
||||
config PROVE_RCU_DELAY
|
||||
bool "RCU debugging: preemptible RCU race provocation"
|
||||
depends on DEBUG_KERNEL && PREEMPT_RCU
|
||||
default n
|
||||
help
|
||||
There is a class of races that involve an unlikely preemption
|
||||
of __rcu_read_unlock() just after ->rcu_read_lock_nesting has
|
||||
been set to INT_MIN. This feature inserts a delay at that
|
||||
point to increase the probability of these races.
|
||||
|
||||
Say Y to increase probability of preemption of __rcu_read_unlock().
|
||||
|
||||
Say N if you are unsure.
|
||||
|
||||
config SPARSE_RCU_POINTER
|
||||
bool "RCU debugging: sparse-based checks for pointer usage"
|
||||
default n
|
||||
|
|
|
|||
|
|
@ -21,6 +21,7 @@ my $lk_path = "./";
|
|||
my $email = 1;
|
||||
my $email_usename = 1;
|
||||
my $email_maintainer = 1;
|
||||
my $email_reviewer = 1;
|
||||
my $email_list = 1;
|
||||
my $email_subscriber_list = 0;
|
||||
my $email_git_penguin_chiefs = 0;
|
||||
|
|
@ -202,6 +203,7 @@ if (!GetOptions(
|
|||
'remove-duplicates!' => \$email_remove_duplicates,
|
||||
'mailmap!' => \$email_use_mailmap,
|
||||
'm!' => \$email_maintainer,
|
||||
'r!' => \$email_reviewer,
|
||||
'n!' => \$email_usename,
|
||||
'l!' => \$email_list,
|
||||
's!' => \$email_subscriber_list,
|
||||
|
|
@ -260,7 +262,8 @@ if ($sections) {
|
|||
}
|
||||
|
||||
if ($email &&
|
||||
($email_maintainer + $email_list + $email_subscriber_list +
|
||||
($email_maintainer + $email_reviewer +
|
||||
$email_list + $email_subscriber_list +
|
||||
$email_git + $email_git_penguin_chiefs + $email_git_blame) == 0) {
|
||||
die "$P: Please select at least 1 email option\n";
|
||||
}
|
||||
|
|
@ -750,6 +753,7 @@ MAINTAINER field selection options:
|
|||
--hg-since => hg history to use (default: $email_hg_since)
|
||||
--interactive => display a menu (mostly useful if used with the --git option)
|
||||
--m => include maintainer(s) if any
|
||||
--r => include reviewer(s) if any
|
||||
--n => include name 'Full Name <addr\@domain.tld>'
|
||||
--l => include list(s) if any
|
||||
--s => include subscriber only list(s) if any
|
||||
|
|
@ -1064,6 +1068,22 @@ sub add_categories {
|
|||
my $role = get_maintainer_role($i);
|
||||
push_email_addresses($pvalue, $role);
|
||||
}
|
||||
} elsif ($ptype eq "R") {
|
||||
my ($name, $address) = parse_email($pvalue);
|
||||
if ($name eq "") {
|
||||
if ($i > 0) {
|
||||
my $tv = $typevalue[$i - 1];
|
||||
if ($tv =~ m/^(\C):\s*(.*)/) {
|
||||
if ($1 eq "P") {
|
||||
$name = $2;
|
||||
$pvalue = format_email($name, $address, $email_usename);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if ($email_reviewer) {
|
||||
push_email_addresses($pvalue, 'reviewer');
|
||||
}
|
||||
} elsif ($ptype eq "T") {
|
||||
push(@scm, $pvalue);
|
||||
} elsif ($ptype eq "W") {
|
||||
|
|
|
|||
|
|
@ -54,10 +54,16 @@ do
|
|||
if test -f "$i/qemu-cmd"
|
||||
then
|
||||
print_bug qemu failed
|
||||
echo " $i"
|
||||
elif test -f "$i/buildonly"
|
||||
then
|
||||
echo Build-only run, no boot/test
|
||||
configcheck.sh $i/.config $i/ConfigFragment
|
||||
parse-build.sh $i/Make.out $configfile
|
||||
else
|
||||
print_bug Build failed
|
||||
echo " $i"
|
||||
fi
|
||||
echo " $i"
|
||||
fi
|
||||
done
|
||||
done
|
||||
|
|
|
|||
|
|
@ -42,6 +42,7 @@ grace=120
|
|||
|
||||
T=/tmp/kvm-test-1-run.sh.$$
|
||||
trap 'rm -rf $T' 0
|
||||
touch $T
|
||||
|
||||
. $KVM/bin/functions.sh
|
||||
. $KVPATH/ver_functions.sh
|
||||
|
|
@ -131,7 +132,10 @@ boot_args=$6
|
|||
|
||||
cd $KVM
|
||||
kstarttime=`awk 'BEGIN { print systime() }' < /dev/null`
|
||||
echo ' ---' `date`: Starting kernel
|
||||
if test -z "$TORTURE_BUILDONLY"
|
||||
then
|
||||
echo ' ---' `date`: Starting kernel
|
||||
fi
|
||||
|
||||
# Generate -smp qemu argument.
|
||||
qemu_args="-nographic $qemu_args"
|
||||
|
|
@ -157,12 +161,13 @@ boot_args="`configfrag_boot_params "$boot_args" "$config_template"`"
|
|||
# Generate kernel-version-specific boot parameters
|
||||
boot_args="`per_version_boot_params "$boot_args" $builddir/.config $seconds`"
|
||||
|
||||
echo $QEMU $qemu_args -m 512 -kernel $builddir/$BOOT_IMAGE -append \"$qemu_append $boot_args\" > $resdir/qemu-cmd
|
||||
if test -n "$TORTURE_BUILDONLY"
|
||||
then
|
||||
echo Build-only run specified, boot/test omitted.
|
||||
touch $resdir/buildonly
|
||||
exit 0
|
||||
fi
|
||||
echo $QEMU $qemu_args -m 512 -kernel $builddir/$BOOT_IMAGE -append \"$qemu_append $boot_args\" > $resdir/qemu-cmd
|
||||
( $QEMU $qemu_args -m 512 -kernel $builddir/$BOOT_IMAGE -append "$qemu_append $boot_args"; echo $? > $resdir/qemu-retval ) &
|
||||
qemu_pid=$!
|
||||
commandcompleted=0
|
||||
|
|
|
|||
|
|
@ -340,12 +340,18 @@ function dump(first, pastlast)
|
|||
for (j = 1; j < jn; j++) {
|
||||
builddir=KVM "/b" j
|
||||
print "rm -f " builddir ".ready"
|
||||
print "echo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date`";
|
||||
print "echo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date` >> " rd "/log";
|
||||
print "if test -z \"$TORTURE_BUILDONLY\""
|
||||
print "then"
|
||||
print "\techo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date`";
|
||||
print "\techo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date` >> " rd "/log";
|
||||
print "fi"
|
||||
}
|
||||
print "wait"
|
||||
print "echo ---- All kernel runs complete. `date`";
|
||||
print "echo ---- All kernel runs complete. `date` >> " rd "/log";
|
||||
print "if test -z \"$TORTURE_BUILDONLY\""
|
||||
print "then"
|
||||
print "\techo ---- All kernel runs complete. `date`";
|
||||
print "\techo ---- All kernel runs complete. `date` >> " rd "/log";
|
||||
print "fi"
|
||||
for (j = 1; j < jn; j++) {
|
||||
builddir=KVM "/b" j
|
||||
print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results:";
|
||||
|
|
@ -385,10 +391,7 @@ echo
|
|||
echo
|
||||
echo " --- `date` Test summary:"
|
||||
echo Results directory: $resdir/$ds
|
||||
if test -z "$TORTURE_BUILDONLY"
|
||||
then
|
||||
kvm-recheck.sh $resdir/$ds
|
||||
fi
|
||||
kvm-recheck.sh $resdir/$ds
|
||||
___EOF___
|
||||
|
||||
if test "$dryrun" = script
|
||||
|
|
@ -403,7 +406,7 @@ then
|
|||
sed -e 's/:.*$//' -e 's/^echo //'
|
||||
exit 0
|
||||
else
|
||||
# Not a dryru, so run the script.
|
||||
# Not a dryrun, so run the script.
|
||||
sh $T/script
|
||||
fi
|
||||
|
||||
|
|
|
|||
|
|
@ -15,7 +15,6 @@ CONFIG_RCU_FANOUT_EXACT=n
|
|||
CONFIG_RCU_NOCB_CPU=y
|
||||
CONFIG_RCU_NOCB_CPU_ZERO=y
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_FANOUT_EXACT=n
|
|||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=y
|
||||
CONFIG_PROVE_LOCKING=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=y
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_FANOUT_EXACT=n
|
|||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=y
|
||||
CONFIG_PROVE_LOCKING=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=y
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -14,7 +14,6 @@ CONFIG_RCU_FANOUT_LEAF=4
|
|||
CONFIG_RCU_FANOUT_EXACT=n
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_RCU_BOOST=y
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_FANOUT_LEAF=2
|
|||
CONFIG_RCU_FANOUT_EXACT=n
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=y
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=y
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_NOCB_CPU_NONE=y
|
|||
CONFIG_DEBUG_LOCK_ALLOC=y
|
||||
CONFIG_PROVE_LOCKING=y
|
||||
CONFIG_PROVE_RCU=y
|
||||
CONFIG_PROVE_RCU_DELAY=y
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
|
|
|
|||
|
|
@ -19,7 +19,6 @@ CONFIG_RCU_NOCB_CPU=n
|
|||
CONFIG_DEBUG_LOCK_ALLOC=y
|
||||
CONFIG_PROVE_LOCKING=y
|
||||
CONFIG_PROVE_RCU=y
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
|
||||
|
|
|
|||
|
|
@ -17,7 +17,6 @@ CONFIG_RCU_FANOUT_LEAF=2
|
|||
CONFIG_RCU_FANOUT_EXACT=n
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=y
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_FANOUT_LEAF=2
|
|||
CONFIG_RCU_NOCB_CPU=y
|
||||
CONFIG_RCU_NOCB_CPU_ALL=y
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@ CONFIG_RCU_FANOUT_LEAF=2
|
|||
CONFIG_RCU_NOCB_CPU=y
|
||||
CONFIG_RCU_NOCB_CPU_ALL=y
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@ CONFIG_SUSPEND=n
|
|||
CONFIG_HIBERNATION=n
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_RCU_DELAY=n
|
||||
CONFIG_RCU_CPU_STALL_INFO=n
|
||||
CONFIG_RCU_CPU_STALL_VERBOSE=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@ CONFIG_PREEMPT_VOLUNTARY=n
|
|||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_TREE_PREEMPT_RCU=y
|
||||
CONFIG_DEBUG_KERNEL=y
|
||||
CONFIG_PROVE_RCU_DELAY=y
|
||||
CONFIG_DEBUG_OBJECTS=y
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
|
||||
CONFIG_RT_MUTEXES=y
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@ CONFIG_PREEMPT_VOLUNTARY=n
|
|||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_TREE_PREEMPT_RCU=y
|
||||
CONFIG_DEBUG_KERNEL=y
|
||||
CONFIG_PROVE_RCU_DELAY=y
|
||||
CONFIG_DEBUG_OBJECTS=y
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
|
||||
CONFIG_RT_MUTEXES=y
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@ CONFIG_PREEMPT_VOLUNTARY=n
|
|||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_TREE_PREEMPT_RCU=y
|
||||
CONFIG_DEBUG_KERNEL=y
|
||||
CONFIG_PROVE_RCU_DELAY=y
|
||||
CONFIG_DEBUG_OBJECTS=y
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
|
||||
CONFIG_RT_MUTEXES=y
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@ CONFIG_PREEMPT_VOLUNTARY=n
|
|||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_TREE_PREEMPT_RCU=y
|
||||
CONFIG_DEBUG_KERNEL=y
|
||||
CONFIG_PROVE_RCU_DELAY=y
|
||||
CONFIG_DEBUG_OBJECTS=y
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
|
||||
CONFIG_RT_MUTEXES=y
|
||||
|
|
|
|||
|
|
@ -14,7 +14,6 @@ CONFIG_NO_HZ_FULL_SYSIDLE -- Do one.
|
|||
CONFIG_PREEMPT -- Do half. (First three and #8.)
|
||||
CONFIG_PROVE_LOCKING -- Do all but two, covering CONFIG_PROVE_RCU and not.
|
||||
CONFIG_PROVE_RCU -- Do all but one under CONFIG_PROVE_LOCKING.
|
||||
CONFIG_PROVE_RCU_DELAY -- Do one.
|
||||
CONFIG_RCU_BOOST -- one of TREE_PREEMPT_RCU.
|
||||
CONFIG_RCU_BOOST_PRIO -- set to 2 for _BOOST testing.
|
||||
CONFIG_RCU_CPU_STALL_INFO -- do one with and without _VERBOSE.
|
||||
|
|
|
|||
Loading…
Reference in a new issue