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memcg: refactor mem_cgroup_resize_limit()

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mem_cgroup_resize_limit() and mem_cgroup_resize_memsw_limit() have
identical logics.  Refactor code so we don't need to keep two pieces of
code that does same thing.

Link: http://lkml.kernel.org/r/20180108224238.14583-1-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yu Zhao 2018-01-31 16:20:02 -08:00 committed by Linus Torvalds
parent 9c3760eb80
commit c054a78c66
1 changed files with 17 additions and 60 deletions
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77
mm/memcontrol.c
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@ -2461,13 +2461,15 @@ static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
static DEFINE_MUTEX(memcg_limit_mutex);
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
unsigned long limit)
unsigned long limit, bool memsw)
{
unsigned long curusage;
unsigned long oldusage;
bool enlarge = false;
int retry_count;
int ret;
bool limits_invariant;
struct page_counter *counter = memsw ? &memcg->memsw : &memcg->memory;
/*
* For keeping hierarchical_reclaim simple, how long we should retry
@ -2477,7 +2479,7 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
retry_count = MEM_CGROUP_RECLAIM_RETRIES *
mem_cgroup_count_children(memcg);
oldusage = page_counter_read(&memcg->memory);
oldusage = page_counter_read(counter);
do {
if (signal_pending(current)) {
@ -2486,73 +2488,28 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
}
mutex_lock(&memcg_limit_mutex);
if (limit > memcg->memsw.limit) {
/*
* Make sure that the new limit (memsw or memory limit) doesn't
* break our basic invariant rule memory.limit <= memsw.limit.
*/
limits_invariant = memsw ? limit >= memcg->memory.limit :
limit <= memcg->memsw.limit;
if (!limits_invariant) {
mutex_unlock(&memcg_limit_mutex);
ret = -EINVAL;
break;
}
if (limit > memcg->memory.limit)
if (limit > counter->limit)
enlarge = true;
ret = page_counter_limit(&memcg->memory, limit);
ret = page_counter_limit(counter, limit);
mutex_unlock(&memcg_limit_mutex);
if (!ret)
break;
try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, true);
try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, !memsw);
curusage = page_counter_read(&memcg->memory);
/* Usage is reduced ? */
if (curusage >= oldusage)
retry_count--;
else
oldusage = curusage;
} while (retry_count);
if (!ret && enlarge)
memcg_oom_recover(memcg);
return ret;
}
static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
unsigned long limit)
{
unsigned long curusage;
unsigned long oldusage;
bool enlarge = false;
int retry_count;
int ret;
/* see mem_cgroup_resize_res_limit */
retry_count = MEM_CGROUP_RECLAIM_RETRIES *
mem_cgroup_count_children(memcg);
oldusage = page_counter_read(&memcg->memsw);
do {
if (signal_pending(current)) {
ret = -EINTR;
break;
}
mutex_lock(&memcg_limit_mutex);
if (limit < memcg->memory.limit) {
mutex_unlock(&memcg_limit_mutex);
ret = -EINVAL;
break;
}
if (limit > memcg->memsw.limit)
enlarge = true;
ret = page_counter_limit(&memcg->memsw, limit);
mutex_unlock(&memcg_limit_mutex);
if (!ret)
break;
try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, false);
curusage = page_counter_read(&memcg->memsw);
curusage = page_counter_read(counter);
/* Usage is reduced ? */
if (curusage >= oldusage)
retry_count--;
@ -3014,10 +2971,10 @@ static ssize_t mem_cgroup_write(struct kernfs_open_file *of,
}
switch (MEMFILE_TYPE(of_cft(of)->private)) {
case _MEM:
ret = mem_cgroup_resize_limit(memcg, nr_pages);
ret = mem_cgroup_resize_limit(memcg, nr_pages, false);
break;
case _MEMSWAP:
ret = mem_cgroup_resize_memsw_limit(memcg, nr_pages);
ret = mem_cgroup_resize_limit(memcg, nr_pages, true);
break;
case _KMEM:
ret = memcg_update_kmem_limit(memcg, nr_pages);