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Subject[PATCH] OOM killer: wait for tasks with pending SIGKILL to exit
Date
If OOM killer finds a task which is about to exit or is already doing so,
there is no need to kill anyone. It should just wait until task dies.

Add missing fatal_signal_pending() check and allow selected task to use memory
reserves in order to exit quickly.

Also remove redundant PF_EXITING check after victim has been selected.

Signed-off-by: Sergey Dyasly <dserrg@gmail.com>
---
mm/oom_kill.c | 17 +++++------------
1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 98e75f2..ef83b81 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -275,13 +275,16 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
if (oom_task_origin(task))
return OOM_SCAN_SELECT;

- if (task->flags & PF_EXITING && !force_kill) {
+ if ((task->flags & PF_EXITING || fatal_signal_pending(task)) &&
+ !force_kill) {
/*
* If this task is not being ptraced on exit, then wait for it
* to finish before killing some other task unnecessarily.
*/
- if (!(task->group_leader->ptrace & PT_TRACE_EXIT))
+ if (!(task->group_leader->ptrace & PT_TRACE_EXIT)) {
+ set_tsk_thread_flag(task, TIF_MEMDIE);
return OOM_SCAN_ABORT;
+ }
}
return OOM_SCAN_OK;
}
@@ -412,16 +415,6 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
static DEFINE_RATELIMIT_STATE(oom_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);

- /*
- * If the task is already exiting, don't alarm the sysadmin or kill
- * its children or threads, just set TIF_MEMDIE so it can die quickly
- */
- if (p->flags & PF_EXITING) {
- set_tsk_thread_flag(p, TIF_MEMDIE);
- put_task_struct(p);
- return;
- }
-
if (__ratelimit(&oom_rs))
dump_header(p, gfp_mask, order, memcg, nodemask);

--
1.8.1.2


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