diff options
| author | David Rientjes <rientjes@google.com> | 2007-10-16 23:25:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:46 -0700 |
| commit | fe071d7e8aae5745c009c808bb8933f22a9e305a (patch) | |
| tree | 757dc7c41a7b56974c383743103fb711c976c288 /Documentation/sysctl | |
| parent | ff0ceb9deb6eb017f52900b708d49cfa77bf25fb (diff) | |
| download | lwn-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 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/vm.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index a0ccc5b60260..17346da636e7 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. + ============================================================== mmap_min_addr |