The OOM kill sysrq (alt+sysrq+F) should allow the user to kill the
process with the highest OOM badness with a single execution.
However, at the moment, the OOM kill can bail out if an OOM notifier
(e.g. the i915 one) says that it reclaimed a tiny amount of memory
from somewhere. That's probably not what the user wants.
As documented in struct oom_control, order == -1 means the oom kill is
required by sysrq. So check for that, and if it's true, don't bail out
no matter what the OOM notifiers say.
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
---
mm/oom_kill.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 1ddabefcfb5a..dc645cbc6e0d 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -1051,13 +1051,14 @@ EXPORT_SYMBOL_GPL(unregister_oom_notifier);
bool out_of_memory(struct oom_control *oc)
{
unsigned long freed = 0;
+ bool sysrq_forced = oc->order == -1;
if (oom_killer_disabled)
return false;
if (!is_memcg_oom(oc)) {
blocking_notifier_call_chain(&oom_notify_list, 0, &freed);
- if (freed > 0)
+ if (freed > 0 && !sysrq_forced)
/* Got some memory back in the last second. */
return true;
}
base-commit: c9e6606c7fe92b50a02ce51dda82586ebdf99b48
--
2.34.1.448.ga2b2bfdf31-goog
