The patch below fixes oom_kill_task() so it doesn't call mmput()
(which may sleep) while holding tasklist_lock.
Signed-Off-By: David S. Peterson <[email protected]>
---
Below is a revised version of my previous OOM killer patch. I expect
to be away from my computer until Monday, 4/24. If you have any
problems merging this into your tree, let me know and I'll fix things
up when I get back.
Dave
diff -urNp -X /home/dsp/dontdiff linux-2.6.17-rc1/mm/oom_kill.c linux-2.6.17-rc1-fix/mm/oom_kill.c
--- linux-2.6.17-rc1/mm/oom_kill.c 2006-03-19 21:53:29.000000000 -0800
+++ linux-2.6.17-rc1-fix/mm/oom_kill.c 2006-04-14 13:22:15.000000000 -0700
@@ -244,17 +244,15 @@ static void __oom_kill_task(task_t *p, c
force_sig(SIGKILL, p);
}
-static struct mm_struct *oom_kill_task(task_t *p, const char *message)
+static int oom_kill_task(task_t *p, const char *message)
{
- struct mm_struct *mm = get_task_mm(p);
+ struct mm_struct *mm;
task_t * g, * q;
- if (!mm)
- return NULL;
- if (mm == &init_mm) {
- mmput(mm);
- return NULL;
- }
+ mm = p->mm;
+
+ if ((mm == NULL) || (mm == &init_mm))
+ return 1;
__oom_kill_task(p, message);
/*
@@ -266,13 +264,12 @@ static struct mm_struct *oom_kill_task(t
__oom_kill_task(q, message);
while_each_thread(g, q);
- return mm;
+ return 0;
}
-static struct mm_struct *oom_kill_process(struct task_struct *p,
- unsigned long points, const char *message)
+static int oom_kill_process(struct task_struct *p, unsigned long points,
+ const char *message)
{
- struct mm_struct *mm;
struct task_struct *c;
struct list_head *tsk;
@@ -283,9 +280,8 @@ static struct mm_struct *oom_kill_proces
c = list_entry(tsk, struct task_struct, sibling);
if (c->mm == p->mm)
continue;
- mm = oom_kill_task(c, message);
- if (mm)
- return mm;
+ if (!oom_kill_task(c, message))
+ return 0;
}
return oom_kill_task(p, message);
}
@@ -300,7 +296,6 @@ static struct mm_struct *oom_kill_proces
*/
void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
{
- struct mm_struct *mm = NULL;
task_t *p;
unsigned long points = 0;
@@ -320,12 +315,12 @@ void out_of_memory(struct zonelist *zone
*/
switch (constrained_alloc(zonelist, gfp_mask)) {
case CONSTRAINT_MEMORY_POLICY:
- mm = oom_kill_process(current, points,
+ oom_kill_process(current, points,
"No available memory (MPOL_BIND)");
break;
case CONSTRAINT_CPUSET:
- mm = oom_kill_process(current, points,
+ oom_kill_process(current, points,
"No available memory in cpuset");
break;
@@ -347,8 +342,7 @@ retry:
panic("Out of memory and no killable processes...\n");
}
- mm = oom_kill_process(p, points, "Out of memory");
- if (!mm)
+ if (oom_kill_process(p, points, "Out of memory"))
goto retry;
break;
@@ -357,8 +351,6 @@ retry:
out:
read_unlock(&tasklist_lock);
cpuset_unlock();
- if (mm)
- mmput(mm);
/*
* Give "p" a good chance of killing itself before we
-
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