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perf_counter: add more context information

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Change the callchain context entries to u16, so as to gain some space.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094517.457320003@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-06 11:45:00 +02:00 committed by Ingo Molnar
parent a2e87d06dd
commit 9c03d88e32
2 changed files with 4 additions and 6 deletions
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4
include/linux/perf_counter.h
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@ -507,10 +507,10 @@ extern void perf_counter_mmap(unsigned long addr, unsigned long len,
extern void perf_counter_munmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file);
#define MAX_STACK_DEPTH 254
#define MAX_STACK_DEPTH 255
struct perf_callchain_entry {
u32 nr, hv, kernel, user;
u16 nr, hv, kernel, user;
u64 ip[MAX_STACK_DEPTH];
};

6
kernel/perf_counter.c
View file

@ -1657,9 +1657,7 @@ void perf_counter_do_pending(void)
* Callchain support -- arch specific
*/
struct perf_callchain_entry *
__attribute__((weak))
perf_callchain(struct pt_regs *regs)
__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
{
return NULL;
}
@ -1819,7 +1817,7 @@ void perf_counter_output(struct perf_counter *counter,
callchain = perf_callchain(regs);
if (callchain) {
callchain_size = (2 + callchain->nr) * sizeof(u64);
callchain_size = (1 + callchain->nr) * sizeof(u64);
header.type |= __PERF_EVENT_CALLCHAIN;
header.size += callchain_size;