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-rw-r--r--include/linux/oom.h11
-rw-r--r--mm/memcontrol.c2
-rw-r--r--mm/oom_kill.c6
3 files changed, 15 insertions, 4 deletions
diff --git a/include/linux/oom.h b/include/linux/oom.h
index e8d6e1058723..853698c721f7 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -92,6 +92,17 @@ static inline bool oom_gfp_allowed(gfp_t gfp_mask)
extern struct task_struct *find_lock_task_mm(struct task_struct *p);
+static inline bool task_will_free_mem(struct task_struct *task)
+{
+ /*
+ * A coredumping process may sleep for an extended period in exit_mm(),
+ * so the oom killer cannot assume that the process will promptly exit
+ * and release memory.
+ */
+ return (task->flags & PF_EXITING) &&
+ !(task->signal->flags & SIGNAL_GROUP_COREDUMP);
+}
+
/* sysctls */
extern int sysctl_oom_dump_tasks;
extern int sysctl_oom_kill_allocating_task;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c6ac50e7d1c2..998fb1756d43 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1559,7 +1559,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
* select it. The goal is to allow it to allocate so that it may
* quickly exit and free its memory.
*/
- if (fatal_signal_pending(current) || current->flags & PF_EXITING) {
+ if (fatal_signal_pending(current) || task_will_free_mem(current)) {
set_thread_flag(TIF_MEMDIE);
return;
}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 864bba992735..f694ef0d9f9a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -281,7 +281,7 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
if (oom_task_origin(task))
return OOM_SCAN_SELECT;
- if (task->flags & PF_EXITING && !force_kill) {
+ if (task_will_free_mem(task) && !force_kill) {
/*
* If this task is not being ptraced on exit, then wait for it
* to finish before killing some other task unnecessarily.
@@ -443,7 +443,7 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
* If the task is already exiting, don't alarm the sysadmin or kill
* its children or threads, just set TIF_MEMDIE so it can die quickly
*/
- if (p->flags & PF_EXITING) {
+ if (task_will_free_mem(p)) {
set_tsk_thread_flag(p, TIF_MEMDIE);
put_task_struct(p);
return;
@@ -649,7 +649,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
* select it. The goal is to allow it to allocate so that it may
* quickly exit and free its memory.
*/
- if (fatal_signal_pending(current) || current->flags & PF_EXITING) {
+ if (fatal_signal_pending(current) || task_will_free_mem(current)) {
set_thread_flag(TIF_MEMDIE);
return;
}