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mm: add a helper function to check may oom condition 

Use helper function to check if we need to deal with oom condition.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Qiang Huang 2013-11-12 15:07:22 -08:00 committed by Linus Torvalds
parent 9c2606b77d
commit b9921ecdee
3 changed files with 7 additions and 9 deletions
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5
include/linux/oom.h
View File

@ -82,6 +82,11 @@ static inline void oom_killer_enable(void)
oom_killer_disabled = false;
}
static inline bool oom_gfp_allowed(gfp_t gfp_mask)
{
return (gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY);
}
extern struct task_struct *find_lock_task_mm(struct task_struct *p);
/* sysctls */

9
mm/memcontrol.c
View File

@ -2984,21 +2984,14 @@ static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
struct res_counter *fail_res;
struct mem_cgroup *_memcg;
int ret = 0;
bool may_oom;
ret = res_counter_charge(&memcg->kmem, size, &fail_res);
if (ret)
return ret;
/*
* Conditions under which we can wait for the oom_killer. Those are
* the same conditions tested by the core page allocator
*/
may_oom = (gfp & __GFP_FS) && !(gfp & __GFP_NORETRY);
_memcg = memcg;
ret = __mem_cgroup_try_charge(NULL, gfp, size >> PAGE_SHIFT,
&_memcg, may_oom);
&_memcg, oom_gfp_allowed(gfp));
if (ret == -EINTR) {
/*

2
mm/page_alloc.c
View File

@ -2593,7 +2593,7 @@ rebalance:
* running out of options and have to consider going OOM
*/
if (!did_some_progress) {
if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
if (oom_gfp_allowed(gfp_mask)) {
if (oom_killer_disabled)
goto nopage;
/* Coredumps can quickly deplete all memory reserves */