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| author |   Oleg Nesterov <oleg@redhat.com> | 2016-08-02 14:03:19 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 17:31:41 -0400 |
| commit | ef419398b68925f21fd3d8463c7bf6934d2ec926 (patch) | |
| tree | 7e8d69e75acb73da297061a5201e20a0c634f207 /fs/proc | |
| parent | MAINTAINERS: befs: add new maintainers (diff) | |
| download | linux-dev-ef419398b68925f21fd3d8463c7bf6934d2ec926.tar.xz linux-dev-ef419398b68925f21fd3d8463c7bf6934d2ec926.zip | |
proc_oom_score: remove tasklist_lock and pid_alive()
This was needed before to ensure that ->signal != 0 and do_each_thread()
is safe, see commit b95c35e76b29b ("oom: fix the unsafe usage of
badness() in proc_oom_score()") for details.
Today tsk->signal can't go away and for_each_thread(tsk) is always safe.
Link: http://lkml.kernel.org/r/20160608211921.GA15508@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 31370da2ee7c..54e270262979 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -579,11 +579,8 @@ static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, unsigned long totalpages = totalram_pages + total_swap_pages; unsigned long points = 0; - read_lock(&tasklist_lock); - if (pid_alive(task)) - points = oom_badness(task, NULL, NULL, totalpages) * - 1000 / totalpages; - read_unlock(&tasklist_lock); + points = oom_badness(task, NULL, NULL, totalpages) * + 1000 / totalpages; seq_printf(m, "%lu\n", points); return 0; |