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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 /Documentation
parentff0ceb9deb6eb017f52900b708d49cfa77bf25fb (diff)
downloadop-kernel-dev-fe071d7e8aae5745c009c808bb8933f22a9e305a.zip
op-kernel-dev-fe071d7e8aae5745c009c808bb8933f22a9e305a.tar.gz
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 'Documentation')
-rw-r--r--Documentation/sysctl/vm.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index a0ccc5b..17346da 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -31,6 +31,7 @@ Currently, these files are in /proc/sys/vm:
- min_unmapped_ratio
- min_slab_ratio
- panic_on_oom
+- oom_kill_allocating_task
- mmap_min_address
- numa_zonelist_order
@@ -220,6 +221,27 @@ The default value is 0.
1 and 2 are for failover of clustering. Please select either
according to your policy of failover.
+=============================================================
+
+oom_kill_allocating_task
+
+This enables or disables killing the OOM-triggering task in
+out-of-memory situations.
+
+If this is set to zero, the OOM killer will scan through the entire
+tasklist and select a task based on heuristics to kill. This normally
+selects a rogue memory-hogging task that frees up a large amount of
+memory when killed.
+
+If this is set to non-zero, the OOM killer simply kills the task that
+triggered the out-of-memory condition. This avoids the expensive
+tasklist scan.
+
+If panic_on_oom is selected, it takes precedence over whatever value
+is used in oom_kill_allocating_task.
+
+The default value is 0.
+
==============================================================
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