David Rientjes 778c14affa mm, oom: base root bonus on current usage ... A 3% of system memory bonus is sometimes too excessive in comparison to other processes. With commit a63d83f427 ("oom: badness heuristic rewrite"), the OOM killer tries to avoid killing privileged tasks by subtracting 3% of overall memory (system or cgroup) from their per-task consumption. But as a result, all root tasks that consume less than 3% of overall memory are considered equal, and so it only takes 33+ privileged tasks pushing the system out of memory for the OOM killer to do something stupid and kill dhclient or other root-owned processes. For example, on a 32G machine it can't tell the difference between the 1M agetty and the 10G fork bomb member. The changelog describes this 3% boost as the equivalent to the global overcommit limit being 3% higher for privileged tasks, but this is not the same as discounting 3% of overall memory from _every privileged task individually_ during OOM selection. Replace the 3% of system memory bonus with a 3% of current memory usage bonus. By giving root tasks a bonus that is proportional to their actual size, they remain comparable even when relatively small. In the example above, the OOM killer will discount the 1M agetty's 256 badness points down to 179, and the 10G fork bomb's 262144 points down to 183500 points and make the right choice, instead of discounting both to 0 and killing agetty because it's first in the task list. Signed-off-by: David Rientjes <rientjes@google.com> Reported-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-01-30 16:56:56 -08:00
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caching
cifs
configfs
nfs
pohmelfs
00-INDEX	Documentation/filesystems/00-INDEX: updates	2014-01-23 16:37:01 -08:00
9p.txt	9p: update documentation	2014-01-24 10:55:21 -06:00
adfs.txt
affs.txt
afs.txt
autofs4-mount-control.txt
automount-support.txt
befs.txt
bfs.txt
btrfs.txt
ceph.txt
coda.txt
cramfs.txt
debugfs.txt
devpts.txt
directory-locking
dlmfs.txt
dnotify.txt
dnotify_test.c
ecryptfs.txt
efivarfs.txt
exofs.txt
ext2.txt
ext3.txt
ext4.txt
f2fs.txt
fiemap.txt
files.txt
fuse.txt
gfs2-glocks.txt
gfs2-uevents.txt
gfs2.txt
hfs.txt
hfsplus.txt
hpfs.txt
inotify.txt
isofs.txt
jfs.txt
Locking
locks.txt
logfs.txt
Makefile
mandatory-locking.txt
ncpfs.txt
nilfs2.txt
ntfs.txt
ocfs2.txt
omfs.txt
path-lookup.txt
porting
proc.txt	mm, oom: base root bonus on current usage	2014-01-30 16:56:56 -08:00
qnx6.txt
quota.txt
ramfs-rootfs-initramfs.txt
relay.txt
romfs.txt
seq_file.txt
sharedsubtree.txt
spufs.txt
squashfs.txt
sysfs-pci.txt
sysfs-tagging.txt
sysfs.txt	Documentation/filesystems/sysfs.txt: fix device_attribute declaration	2014-01-23 16:37:00 -08:00
sysv-fs.txt
tmpfs.txt
ubifs.txt
udf.txt
ufs.txt
vfat.txt
vfs.txt
xfs-delayed-logging-design.txt
xfs-self-describing-metadata.txt
xfs.txt
xip.txt