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-rw-r--r--mm/oom_kill.c25
1 files changed, 12 insertions, 13 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 50b984d048ce..195b3661da3d 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -641,6 +641,8 @@ done:
static int oom_reaper(void *unused)
{
+ set_freezable();
+
while (true) {
struct task_struct *tsk = NULL;
@@ -1120,27 +1122,24 @@ bool out_of_memory(struct oom_control *oc)
}
/*
- * The pagefault handler calls here because it is out of memory, so kill a
- * memory-hogging task. If oom_lock is held by somebody else, a parallel oom
- * killing is already in progress so do nothing.
+ * The pagefault handler calls here because some allocation has failed. We have
+ * to take care of the memcg OOM here because this is the only safe context without
+ * any locks held but let the oom killer triggered from the allocation context care
+ * about the global OOM.
*/
void pagefault_out_of_memory(void)
{
- struct oom_control oc = {
- .zonelist = NULL,
- .nodemask = NULL,
- .memcg = NULL,
- .gfp_mask = 0,
- .order = 0,
- };
+ static DEFINE_RATELIMIT_STATE(pfoom_rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
if (mem_cgroup_oom_synchronize(true))
return;
- if (!mutex_trylock(&oom_lock))
+ if (fatal_signal_pending(current))
return;
- out_of_memory(&oc);
- mutex_unlock(&oom_lock);
+
+ if (__ratelimit(&pfoom_rs))
+ pr_warn("Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF\n");
}
SYSCALL_DEFINE2(process_mrelease, int, pidfd, unsigned int, flags)