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authorDavid Rientjes <rientjes@google.com>2012-08-01 03:43:48 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 05:42:45 +0400
commit876aafbfd9ba5bb352f1b14622c27f3fe9a99013 (patch)
treefdd18b6caa0c9baa56b76feb9b05339919f283dd
parent6b0c81b3be114a93f79bd4c5639ade5107d77c21 (diff)
downloadlinux-876aafbfd9ba5bb352f1b14622c27f3fe9a99013.tar.xz
mm, memcg: move all oom handling to memcontrol.c
By globally defining check_panic_on_oom(), the memcg oom handler can be moved entirely to mm/memcontrol.c. This removes the ugly #ifdef in the oom killer and cleans up the code. Signed-off-by: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Oleg Nesterov <oleg@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memcontrol.h2
-rw-r--r--include/linux/oom.h3
-rw-r--r--mm/memcontrol.c15
-rw-r--r--mm/oom_kill.c23
4 files changed, 18 insertions, 25 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 2a80544aec99..5a3ee6423634 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -180,8 +180,6 @@ static inline void mem_cgroup_dec_page_stat(struct page *page,
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
gfp_t gfp_mask,
unsigned long *total_scanned);
-extern void __mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
- int order);
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
diff --git a/include/linux/oom.h b/include/linux/oom.h
index 5dc0e384ae9e..49a3031fda50 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -61,6 +61,9 @@ extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
+extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
+ int order, const nodemask_t *nodemask);
+
extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
unsigned long totalpages, const nodemask_t *nodemask,
bool force_kill);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 77a29cea5d76..0f692a2dbfcb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1469,8 +1469,8 @@ static u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
return min(limit, memsw);
}
-void __mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
- int order)
+void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
+ int order)
{
struct mem_cgroup *iter;
unsigned long chosen_points = 0;
@@ -1478,6 +1478,17 @@ void __mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
unsigned int points = 0;
struct task_struct *chosen = NULL;
+ /*
+ * If current has a pending SIGKILL, then automatically 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)) {
+ set_thread_flag(TIF_MEMDIE);
+ return;
+ }
+
+ check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
totalpages = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT ? : 1;
for_each_mem_cgroup_tree(iter, memcg) {
struct cgroup *cgroup = iter->css.cgroup;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index a3a32ae02e9d..198600861638 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -556,8 +556,8 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
/*
* Determines whether the kernel must panic because of the panic_on_oom sysctl.
*/
-static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
- int order, const nodemask_t *nodemask)
+void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
+ int order, const nodemask_t *nodemask)
{
if (likely(!sysctl_panic_on_oom))
return;
@@ -575,25 +575,6 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
sysctl_panic_on_oom == 2 ? "compulsory" : "system-wide");
}
-#ifdef CONFIG_MEMCG
-void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
- int order)
-{
- /*
- * If current has a pending SIGKILL, then automatically 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)) {
- set_thread_flag(TIF_MEMDIE);
- return;
- }
-
- check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
- __mem_cgroup_out_of_memory(memcg, gfp_mask, order);
-}
-#endif
-
static BLOCKING_NOTIFIER_HEAD(oom_notify_list);
int register_oom_notifier(struct notifier_block *nb)