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David Rientjes 2ff05b2b4e oom: move oom_adj value from task_struct to mm_struct 
The per-task oom_adj value is a characteristic of its mm more than the
task itself since it's not possible to oom kill any thread that shares the
mm.  If a task were to be killed while attached to an mm that could not be
freed because another thread were set to OOM_DISABLE, it would have
needlessly been terminated since there is no potential for future memory
freeing.

This patch moves oomkilladj (now more appropriately named oom_adj) from
struct task_struct to struct mm_struct.  This requires task_lock() on a
task to check its oom_adj value to protect against exec, but it's already
necessary to take the lock when dereferencing the mm to find the total VM
size for the badness heuristic.

This fixes a livelock if the oom killer chooses a task and another thread
sharing the same memory has an oom_adj value of OOM_DISABLE.  This occurs
because oom_kill_task() repeatedly returns 1 and refuses to kill the
chosen task while select_bad_process() will repeatedly choose the same
task during the next retry.

Taking task_lock() in select_bad_process() to check for OOM_DISABLE and in
oom_kill_task() to check for threads sharing the same memory will be
removed in the next patch in this series where it will no longer be
necessary.

Writing to /proc/pid/oom_adj for a kthread will now return -EINVAL since
these threads are immune from oom killing already.  They simply report an
oom_adj value of OOM_DISABLE.

Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
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>
 		2009-06-16 19:47:43 -07:00
..
9p Fix a leak in failure exit in 9p ->get_sb() 2009-05-09 10:49:40 -04:00
adfs Fix adfs GET_FRAG_ID() on big-endian 2009-06-11 21:36:14 -04:00
affs affs: add ->sync_fs 2009-06-11 21:36:14 -04:00
afs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
autofs switch follow_down() 2009-06-11 21:36:01 -04:00
autofs4 switch follow_down() 2009-06-11 21:36:01 -04:00
befs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
bfs bfs: add ->sync_fs 2009-06-11 21:36:14 -04:00
btrfs enforce ->sync_fs is only called for rw superblock 2009-06-11 21:36:06 -04:00
cachefiles enforce ->sync_fs is only called for rw superblock 2009-06-11 21:36:06 -04:00
cifs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
coda splice: implement default splice_read method 2009-05-11 14:13:10 +02:00
configfs configfs: Rework configfs_depend_item() locking and make lockdep happy 2009-04-30 10:48:26 -07:00
cramfs
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debugfs
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devpts devpts: unregister the file system on error 2009-06-11 08:51:06 -07:00
dlm dlm: use more NOFS allocation 2009-05-15 11:24:59 -05:00
ecryptfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
efs
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exofs [SCSI] Merge branch 'linus' 2009-06-12 10:02:03 -05:00
exportfs
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ext2 trivial: ext2: fix a typo in comment in ext2.h 2009-06-12 18:01:44 +02:00
ext3 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
ext4 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
fat fat: add ->sync_fs 2009-06-11 21:36:15 -04:00
freevxfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
fscache FS-Cache: Fixup renamed filenames in comments in internal.h 2009-05-27 10:20:13 -07:00
fuse Merge branch 'cuse' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2009-06-12 09:31:20 -07:00
gfs2 GFS2: Remove lock_kernel from gfs2_put_super() 2009-06-12 13:40:47 +01:00
hfs hfs: add ->sync_fs 2009-06-11 21:36:15 -04:00
hfsplus hfsplus: add ->sync_fs 2009-06-11 21:36:16 -04:00
hostfs
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hpfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
hppfs
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hugetlbfs Merge branch 'master' into next 2009-05-22 18:40:59 +10:00
isofs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
jbd jbd: fix race in buffer processing in commit code 2009-06-09 16:59:03 -07:00
jbd2 jbd2: Fix minor typos in comments in fs/jbd2/journal.c 2009-06-09 00:06:20 -04:00
jffs2 jffs2: call jffs2_write_super from jffs2_sync_fs 2009-06-11 21:36:16 -04:00
jfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
lockd lockd: fix list corruption on lockd restart 2009-05-06 17:19:36 -04:00
minix switch minix to simple_fsync() 2009-06-11 21:36:12 -04:00
ncpfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
nfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
nfs_common
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nfsd switch follow_down() 2009-06-11 21:36:01 -04:00
nilfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2 2009-06-15 09:13:49 -07:00
nls
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notify fsnotify: allow groups to set freeing_mark to null 2009-06-11 14:57:55 -04:00
ntfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
ocfs2 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
omfs switch omfs to simple_fsync() 2009-06-11 21:36:13 -04:00
openpromfs
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partitions Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2009-06-12 09:29:42 -07:00
proc oom: move oom_adj value from task_struct to mm_struct 2009-06-16 19:47:43 -07:00
qnx4 fs/qnx4: sanitize includes 2009-06-11 21:36:12 -04:00
quota quota: cleanup dquota sync functions (version 4) 2009-06-11 21:36:04 -04:00
ramfs ramfs: ignore unknown mount options 2009-06-14 17:58:25 -07:00
reiserfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
romfs ROMFS: romfs_dev_read() error ignored 2009-05-09 10:49:41 -04:00
smbfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
squashfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
sysfs sysfs: file.c: use create_singlethread_workqueue() 2009-05-28 14:24:07 -07:00
sysv sysv: add ->sync_fs 2009-06-11 21:36:16 -04:00
ubifs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
udf switch udf to simple_fsync() 2009-06-11 21:36:13 -04:00
ufs ufs: add ->sync_fs 2009-06-11 21:36:16 -04:00
xfs Merge branch 'master' of git://oss.sgi.com/xfs/xfs into for-linus 2009-06-12 21:28:59 -05:00
Kconfig CUSE: implement CUSE - Character device in Userspace 2009-06-09 11:24:11 +02:00
Kconfig.binfmt
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Makefile
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aio.c
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anon_inodes.c
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attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c ptrace: s/parent/real_parent/ in binfmt_elf_fdpic.c 2009-05-02 15:36:10 -07:00
binfmt_em86.c
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binfmt_flat.c flat: fix data sections alignment 2009-05-29 08:40:02 -07:00
binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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bio-integrity.c
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bio.c trivial: fix typo in bio_alloc kernel doc 2009-06-12 18:01:47 +02:00
block_dev.c vfs: Rename fsync_super() to sync_filesystem() (version 4) 2009-06-11 21:36:04 -04:00
buffer.c Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block 2009-06-11 11:10:35 -07:00
char_dev.c fs: Remove i_cindex from struct inode 2009-06-11 21:36:09 -04:00
compat.c trivial: fix comment typo in fs/compat.c 2009-06-12 18:01:44 +02:00
compat_binfmt_elf.c
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compat_ioctl.c trivial: fix typo compatiable/compatiability has extra 'a'. 2009-06-12 18:01:46 +02:00
dcache.c dcache: extrace and use d_unlinked() 2009-06-11 21:36:06 -04:00
dcookies.c
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direct-io.c block: Do away with the notion of hardsect_size 2009-05-22 23:22:54 +02:00
drop_caches.c vfs: skip I_CLEAR state inodes 2009-04-02 19:04:48 -07:00
eventfd.c eventfd: export eventfd_signal and eventfd_fget for lguest 2009-06-12 22:27:09 +09:30
eventpoll.c epoll: fix size check in epoll_create() 2009-05-12 14:11:35 -07:00
exec.c Merge branch 'perfcounters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-11 14:01:07 -07:00
fcntl.c dup2: Fix return value with oldfd == newfd and invalid fd 2009-05-11 12:18:06 -07:00
fifo.c
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file.c
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file_table.c fs: move mark_files_ro into file_table.c 2009-06-11 21:36:02 -04:00
filesystems.c
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fs-writeback.c fs: block_dump missing dentry locking 2009-06-11 21:36:10 -04:00
fs_struct.c
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generic_acl.c
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inode.c trivial: fs/inode: Fix typo in file_update_time nanodoc 2009-06-12 18:01:45 +02:00
internal.h Trim a bit of crap from fs.h 2009-06-11 21:36:07 -04:00
ioctl.c fiemap: fix problem with setting FIEMAP_EXTENT_LAST 2009-05-06 16:36:09 -07:00
ioprio.c
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libfs.c New helper - simple_fsync() 2009-06-11 21:36:11 -04:00
locks.c
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mbcache.c
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mpage.c ext4: Properly initialize the buffer_head state 2009-05-13 15:13:42 -04:00
namei.c switch lookup_mnt() 2009-06-11 21:36:01 -04:00
namespace.c Push BKL down into do_remount_sb() 2009-06-11 21:36:08 -04:00
nfsctl.c
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no-block.c
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open.c fs: introduce mnt_clone_write 2009-06-11 21:36:02 -04:00
pipe.c splice: implement default splice_read method 2009-05-11 14:13:10 +02:00
pnode.c
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pnode.h
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posix_acl.c
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read_write.c splice: implement default splice_read method 2009-05-11 14:13:10 +02:00
read_write.h
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readdir.c
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select.c
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seq_file.c
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signalfd.c
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splice.c splice: fix kmaps in default_file_splice_write() 2009-05-19 11:37:46 +02:00
stack.c
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stat.c
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super.c Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
sync.c remove the call to ->write_super in __sync_filesystem 2009-06-11 21:36:17 -04:00
timerfd.c
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utimes.c
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xattr.c fs: introduce mnt_clone_write 2009-06-11 21:36:02 -04:00
xattr_acl.c
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