(Compile tested, on top of introduce-task_dead-state.patch)
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 <[email protected]>
--- 2.6.18-rc4/mm/oom_kill.c~ 2006-08-27 19:49:27.000000000 +0400
+++ 2.6.18-rc4/mm/oom_kill.c 2006-08-27 20:16:28.000000000 +0400
@@ -207,11 +207,14 @@ static struct task_struct *select_bad_pr
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;
/*
@@ -227,9 +230,6 @@ static struct task_struct *select_bad_pr
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;
-
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