Commit bb29902a authored by Tetsuo Handa's avatar Tetsuo Handa Committed by Linus Torvalds
Browse files

oom, oom_reaper: protect oom_reaper_list using simpler way



"oom, oom_reaper: disable oom_reaper for oom_kill_allocating_task" tried
to protect oom_reaper_list using MMF_OOM_KILLED flag.  But we can do it
by simply checking tsk->oom_reaper_list != NULL.

Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e2679606
......@@ -512,8 +512,6 @@ static inline int get_dumpable(struct mm_struct *mm)
#define MMF_HAS_UPROBES 19 /* has uprobes */
#define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
#define MMF_OOM_KILLED 21 /* OOM killer has chosen this mm */
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
struct sighand_struct {
......
......@@ -547,7 +547,7 @@ static int oom_reaper(void *unused)
static void wake_oom_reaper(struct task_struct *tsk)
{
if (!oom_reaper_th)
if (!oom_reaper_th || tsk->oom_reaper_list)
return;
get_task_struct(tsk);
......@@ -681,7 +681,7 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p,
unsigned int victim_points = 0;
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
bool can_oom_reap;
bool can_oom_reap = true;
/*
* If the task is already exiting, don't alarm the sysadmin or kill
......@@ -743,10 +743,6 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p,
/* Get a reference to safely compare mm after task_unlock(victim) */
mm = victim->mm;
atomic_inc(&mm->mm_count);
/* Make sure we do not try to oom reap the mm multiple times */
can_oom_reap = !test_and_set_bit(MMF_OOM_KILLED, &mm->flags);
/*
* We should send SIGKILL before setting TIF_MEMDIE in order to prevent
* the OOM victim from depleting the memory reserves from the user
......
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