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authorOleg Nesterov <oleg@tv-sign.ru>2006-09-29 02:01:12 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:21 -0700
commit28324d1df646521256e83389244adcce98e89ff2 (patch)
treeaaa81642185611b4996daeba7d65e6b3c3eb05a7 /mm/oom_kill.c
parentc394cc9fbb367f87faa2228ec2eabacd2d4701c6 (diff)
downloadlinux-28324d1df646521256e83389244adcce98e89ff2.tar.bz2
[PATCH] select_bad_process(): kill a bogus PF_DEAD/TASK_DEAD check
The only one usage of TASK_DEAD outside of last schedule path, select_bad_process: for_each_task(p) { if (!p->mm) continue; ... if (p->state == TASK_DEAD) continue; ... TASK_DEAD state is set at the end of do_exit(), this means that p->mm was already set == NULL by exit_mm(), so this task was already rejected by 'if (!p->mm)' above. Note also that the caller holds tasklist_lock, this means that p can't pass exit_notify() and then set TASK_DEAD when p->mm != NULL. Also, remove open-coded is_init(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 21f0a7e8e514..423dcae323a5 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -206,11 +206,14 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
unsigned long points;
int releasing;
- /* skip kernel threads */
+ /*
+ * skip kernel threads and tasks which have already released
+ * their mm.
+ */
if (!p->mm)
continue;
- /* skip the init task with pid == 1 */
- if (p->pid == 1)
+ /* skip the init task */
+ if (is_init(p))
continue;
/*
@@ -226,9 +229,6 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
releasing = test_tsk_thread_flag(p, TIF_MEMDIE) ||
p->flags & PF_EXITING;
if (releasing) {
- /* TASK_DEAD tasks have already released their mm */
- if (p->state == TASK_DEAD)
- continue;
if (p->flags & PF_EXITING && p == current) {
chosen = p;
*ppoints = ULONG_MAX;