Commit 6a2d5679 authored Dec 12, 2014 by Oleg Nesterov Committed by Linus Torvalds Dec 13, 2014

oom: kill the insufficient and no longer needed PT_TRACE_EXIT check



After the previous patch we can remove the PT_TRACE_EXIT check in
oom_scan_process_thread(), it was added to handle the case when the
coredumping was "frozen" by ptrace, but it doesn't really work.  If
nothing else, we would need to check all threads which could share the
same ->mm to make it more or less correct.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d003f371

mm/oom_kill.c

+3 −8

Original line number	Diff line number	Diff line
		@@ -281,14 +281,9 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
		if (oom_task_origin(task))
		return OOM_SCAN_SELECT;

		if (task_will_free_mem(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_will_free_mem(task) && !force_kill)
		return OOM_SCAN_ABORT;
		}

		return OOM_SCAN_OK;
		}