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authorDavid Rientjes <rientjes@google.com>2007-10-16 23:25:56 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:46 -0700
commitfe071d7e8aae5745c009c808bb8933f22a9e305a (patch)
tree757dc7c41a7b56974c383743103fb711c976c288 /mm/oom_kill.c
parentff0ceb9deb6eb017f52900b708d49cfa77bf25fb (diff)
downloadlwn-fe071d7e8aae5745c009c808bb8933f22a9e305a.tar.gz
lwn-fe071d7e8aae5745c009c808bb8933f22a9e305a.zip
oom: add oom_kill_allocating_task sysctl
Adds a new sysctl, 'oom_kill_allocating_task', which will automatically kill the OOM-triggering task instead of scanning through the tasklist to find a memory-hogging target. This is helpful for systems with an insanely large number of tasks where scanning the tasklist significantly degrades performance. Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 6e999c88c503..00d0bd7d6a2b 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -27,6 +27,7 @@
#include <linux/notifier.h>
int sysctl_panic_on_oom;
+int sysctl_oom_kill_allocating_task;
static DEFINE_MUTEX(zone_scan_mutex);
/* #define DEBUG */
@@ -471,14 +472,16 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
"No available memory (MPOL_BIND)");
break;
- case CONSTRAINT_CPUSET:
- oom_kill_process(current, points,
- "No available memory in cpuset");
- break;
-
case CONSTRAINT_NONE:
if (sysctl_panic_on_oom)
panic("out of memory. panic_on_oom is selected\n");
+ /* Fall-through */
+ case CONSTRAINT_CPUSET:
+ if (sysctl_oom_kill_allocating_task) {
+ oom_kill_process(current, points,
+ "Out of memory (oom_kill_allocating_task)");
+ break;
+ }
retry:
/*
* Rambo mode: Shoot down a process and hope it solves whatever