__out_of_memory() only has a single caller, so fold it into
out_of_memory() and add a comment about locking for its call to
oom_kill_process().
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
mm/oom_kill.c | 65 +++++++++++++++++++++++++-------------------------------
1 files changed, 29 insertions(+), 36 deletions(-)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -628,41 +628,6 @@ static void clear_system_oom(void)
spin_unlock(&zone_scan_lock);
}
-
-/*
- * Must be called with tasklist_lock held for read.
- */
-static void __out_of_memory(gfp_t gfp_mask, int order, const nodemask_t *mask)
-{
- struct task_struct *p;
- unsigned long points;
-
- if (sysctl_oom_kill_allocating_task)
- if (!oom_kill_process(current, gfp_mask, order, 0, NULL,
- "Out of memory (oom_kill_allocating_task)"))
- return;
-retry:
- /*
- * Rambo mode: Shoot down a process and hope it solves whatever
- * issues we may have.
- */
- p = select_bad_process(&points, NULL, mask);
-
- if (PTR_ERR(p) == -1UL)
- return;
-
- /* Found nothing?!?! Either we hang forever, or we panic. */
- if (!p) {
- dump_header(NULL, gfp_mask, order, NULL);
- read_unlock(&tasklist_lock);
- panic("Out of memory and no killable processes...\n");
- }
-
- if (oom_kill_process(p, gfp_mask, order, points, NULL,
- "Out of memory"))
- goto retry;
-}
-
/**
* out_of_memory - kill the "best" process when we run out of memory
* @zonelist: zonelist pointer
@@ -678,7 +643,9 @@ retry:
void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
int order, nodemask_t *nodemask)
{
+ struct task_struct *p;
unsigned long freed = 0;
+ unsigned long points;
enum oom_constraint constraint = CONSTRAINT_NONE;
blocking_notifier_call_chain(&oom_notify_list, 0, &freed);
@@ -703,10 +670,36 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
if (zonelist)
constraint = constrained_alloc(zonelist, gfp_mask, nodemask);
check_panic_on_oom(constraint, gfp_mask, order);
+
read_lock(&tasklist_lock);
- __out_of_memory(gfp_mask, order,
+ if (sysctl_oom_kill_allocating_task) {
+ /*
+ * oom_kill_process() needs tasklist_lock held. If it returns
+ * non-zero, current could not be killed so we must fallback to
+ * the tasklist scan.
+ */
+ if (!oom_kill_process(current, gfp_mask, order, 0, NULL,
+ "Out of memory (oom_kill_allocating_task)"))
+ return;
+ }
+
+retry:
+ p = select_bad_process(&points, NULL,
constraint == CONSTRAINT_MEMORY_POLICY ? nodemask :
NULL);
+ if (PTR_ERR(p) == -1UL)
+ return;
+
+ /* Found nothing?!?! Either we hang forever, or we panic. */
+ if (!p) {
+ dump_header(NULL, gfp_mask, order, NULL);
+ read_unlock(&tasklist_lock);
+ panic("Out of memory and no killable processes...\n");
+ }
+
+ if (oom_kill_process(p, gfp_mask, order, points, NULL,
+ "Out of memory"))
+ goto retry;
read_unlock(&tasklist_lock);
/*
--
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