Michal Hocko 44a70adec9 mm, oom_adj: make sure processes sharing mm have same view of oom_score_adj ... oom_score_adj is shared for the thread groups (via struct signal) but this is not sufficient to cover processes sharing mm (CLONE_VM without CLONE_SIGHAND) and so we can easily end up in a situation when some processes update their oom_score_adj and confuse the oom killer. In the worst case some of those processes might hide from the oom killer altogether via OOM_SCORE_ADJ_MIN while others are eligible. OOM killer would then pick up those eligible but won't be allowed to kill others sharing the same mm so the mm wouldn't release the mm and so the memory. It would be ideal to have the oom_score_adj per mm_struct because that is the natural entity OOM killer considers. But this will not work because some programs are doing vfork() set_oom_adj() exec() We can achieve the same though. oom_score_adj write handler can set the oom_score_adj for all processes sharing the same mm if the task is not in the middle of vfork. As a result all the processes will share the same oom_score_adj. The current implementation is rather pessimistic and checks all the existing processes by default if there is more than 1 holder of the mm but we do not have any reliable way to check for external users yet. Link: http://lkml.kernel.org/r/1466426628-15074-5-git-send-email-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: David Rientjes <rientjes@google.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-07-28 16:07:41 -07:00
..
9p	Use the right predicate in ->atomic_open() instances	2016-07-05 16:02:23 -04:00
adfs	fs/adfs/adfs.h: tidy up comments	2016-01-20 17:09:18 -08:00
affs	affs: fix remount failure when there are no options changed	2016-05-28 16:50:24 -07:00
afs	rxrpc: Limit the listening backlog	2016-06-10 18:14:47 -07:00
autofs4	autofs: don't get stuck in a loop if vfs_write() returns an error	2016-06-24 17:23:52 -07:00
befs	fs/befs/io.c:befs_bread(): remove unneeded initialization to NULL	2016-05-23 17:04:14 -07:00
bfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
btrfs	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
cachefiles	FS-Cache: make check_consistency callback return int	2016-06-01 10:29:39 +02:00
ceph	Use the right predicate in ->atomic_open() instances	2016-07-05 16:02:23 -04:00
cifs	mm, memcg: use consistent gfp flags during readahead	2016-07-26 16:19:19 -07:00
coda	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
configfs	configfs: Remove ppos increment in configfs_write_bin_file	2016-06-30 11:28:55 +02:00
cramfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
crypto	block, fs, mm, drivers: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
debugfs	debugfs: open_proxy_open(): avoid double fops release	2016-06-15 04:56:35 -07:00
devpts	devpts: Make each mount of devpts an independent filesystem.	2016-06-05 10:36:01 -07:00
dlm	dlm: Use kmemdup instead of kmalloc and memcpy	2016-06-23 11:55:58 -05:00
ecryptfs	ecryptfs: don't allow mmap when the lower fs doesn't support it	2016-07-08 10:35:28 -05:00
efivarfs	fs/efivarfs/inode.c: use generic UUID library	2016-05-20 17:58:30 -07:00
efs	fs/efs/super.c: fix return value	2016-05-20 17:58:30 -07:00
exofs	block, fs, mm, drivers: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
exportfs	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
ext2	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
ext4	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
f2fs	The major change in this version is mitigating cpu overheads on write paths by	2016-07-27 10:36:31 -07:00
fat	fs: have submit_bh users pass in op and flags separately	2016-06-07 13:41:38 -06:00
freevxfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
fscache	FS-Cache: wake write waiter after invalidating writes	2016-06-01 10:29:09 +02:00
fuse	Use the right predicate in ->atomic_open() instances	2016-07-05 16:02:23 -04:00
gfs2	Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block	2016-07-26 15:37:51 -07:00
hfs	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
hfsplus	hfsplus: use bio op accessors	2016-06-07 13:41:38 -06:00
hostfs	hostfs: switch to ->iterate_shared()	2016-05-12 19:49:30 -04:00
hpfs	hpfs: implement the show_options method	2016-05-28 16:50:24 -07:00
hugetlbfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
isofs	fs: have ll_rw_block users pass in op and flags separately	2016-06-07 13:41:38 -06:00
jbd2	The major change this cycle is deleting ext4's copy of the file system	2016-07-26 18:35:55 -07:00
jffs2	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
jfs	block, fs, mm, drivers: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
kernfs	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
lockd	lockd: unregister notifier blocks if the service fails to come up completely	2016-06-30 16:35:07 -04:00
logfs	block, fs, mm, drivers: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
minix	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
ncpfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
nfs	Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block	2016-07-26 15:03:07 -07:00
nfs_common
nfsd	xfs: update for 4.8-rc1	2016-07-27 09:53:35 -07:00
nilfs2	Merge branch 'for-4.8/core' of git://git.kernel.dk/linux-block	2016-07-26 15:03:07 -07:00
nls
notify	fsnotify: avoid spurious EMFILE errors from inotify_init()	2016-05-19 19:12:14 -07:00
ntfs	fs: have submit_bh users pass in op and flags separately	2016-06-07 13:41:38 -06:00
ocfs2	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
omfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
openpromfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
orangefs	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
overlayfs	ovl: verify upper dentry in ovl_remove_and_whiteout()	2016-07-22 10:54:20 +02:00
proc	mm, oom_adj: make sure processes sharing mm have same view of oom_score_adj	2016-07-28 16:07:41 -07:00
pstore	pstore/ram: add Device Tree bindings	2016-06-14 11:34:39 -07:00
qnx4	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
qnx6	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
quota	fs/quota: use nla_put_u64_64bit()	2016-04-26 12:00:48 -04:00
ramfs	tmpfs/ramfs: fix VM_MAYSHARE mappings for NOMMU	2016-05-20 17:58:30 -07:00
reiserfs	Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block	2016-07-26 15:37:51 -07:00
romfs	romfs, squashfs: switch to ->iterate_shared()	2016-05-09 11:41:15 -04:00
squashfs	fs: have ll_rw_block users pass in op and flags separately	2016-06-07 13:41:38 -06:00
sysfs
sysv	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
tracefs	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
ubifs	UBIFS: Implement ->migratepage()	2016-06-23 00:29:53 +02:00
udf	Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block	2016-07-26 15:37:51 -07:00
ufs	fs: have ll_rw_block users pass in op and flags separately	2016-06-07 13:41:38 -06:00
xfs	xfs: update for 4.8-rc1	2016-07-27 09:53:35 -07:00
aio.c	aio: make aio_setup_ring killable	2016-05-23 17:04:14 -07:00
anon_inodes.c
attr.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
bad_inode.c	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
binfmt_aout.c	fs: fix binfmt_aout.c build error	2016-05-28 16:34:59 -07:00
binfmt_elf_fdpic.c	coredump: fix dumping through pipes	2016-06-07 22:07:09 -04:00
binfmt_elf.c	coredump: fix dumping through pipes	2016-06-07 22:07:09 -04:00
binfmt_em86.c
binfmt_flat.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
binfmt_misc.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
binfmt_script.c
block_dev.c	block: add QUEUE_FLAG_DAX for devices to advertise their DAX support	2016-07-20 21:01:01 -06:00
buffer.c	xfs: update for 4.8-rc1	2016-07-27 09:53:35 -07:00
char_dev.c	chardev: add missing line break in pr_warn	2016-07-14 16:21:53 +09:00
compat_binfmt_elf.c
compat_ioctl.c	[media] cec: add compat32 ioctl support	2016-06-28 10:00:13 -03:00
compat.c	Fix a number of bugs, most notably a potential stale data exposure	2016-05-24 12:55:26 -07:00
coredump.c	coredump: fix dumping through pipes	2016-06-07 22:07:09 -04:00
dax.c	dax: remote unused fault wrappers	2016-07-26 16:19:19 -07:00
dcache.c	fix idiotic braino in d_alloc_parallel()	2016-06-20 10:07:42 -04:00
dcookies.c
direct-io.c	direct-io: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
drop_caches.c
eventfd.c	eventfd: document lockless access in eventfd_poll	2016-03-22 15:36:02 -07:00
eventpoll.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	2016-05-19 19:12:14 -07:00
exec.c	exec: make exec path waiting for mmap_sem killable	2016-05-23 17:04:14 -07:00
fcntl.c
fhandle.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
file_table.c
file.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	2016-05-02 19:49:28 -04:00
filesystems.c	find_filesystem(): simplify comparison	2016-01-19 12:02:23 -05:00
fs_pin.c
fs_struct.c
fs-writeback.c	fs/fs-writeback.c: inode writeback list tracking tracepoints	2016-07-26 16:19:19 -07:00
inode.c	fs/fs-writeback.c: add a new writeback list for sync	2016-07-26 16:19:19 -07:00
internal.h	xfs: update for 4.8-rc1	2016-07-27 09:53:35 -07:00
ioctl.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
iomap.c	fs: iomap based fiemap implementation	2016-06-21 09:38:45 +10:00
Kconfig	fs: introduce iomap infrastructure	2016-06-21 09:23:11 +10:00
Kconfig.binfmt	ELF/MIPS build fix	2016-05-23 17:04:14 -07:00
libfs.c	lockless next_positive()	2016-06-20 17:11:29 -04:00
locks.c	locks: use file_inode()	2016-07-01 10:24:18 -04:00
Makefile	fs: introduce iomap infrastructure	2016-06-21 09:23:11 +10:00
mbcache.c	mbcache: add reusable flag to cache entries	2016-02-22 22:44:04 -05:00
mount.h
mpage.c	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
namei.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-06-07 20:41:36 -07:00
namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-07-01 15:20:11 -07:00
no-block.c
nsfs.c
open.c	Merge branch 'work.const-path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 14:41:03 -07:00
pipe.c	pipe: account to kmemcg	2016-07-26 16:19:19 -07:00
pnode.c	propogate_mnt: Handle the first propogated copy being a slave	2016-05-05 09:54:45 -05:00
pnode.h
posix_acl.c	posix_acl: Add set_posix_acl	2016-06-24 12:11:34 -04:00
proc_namespace.c	vfs: show_vfsstat: do not ignore errors from show_devname method	2016-03-16 13:09:08 -04:00
read_write.c	x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2	2016-07-15 10:30:26 +02:00
readdir.c	restore killability of old mutex_lock_killable(&inode->i_mutex) users	2016-05-26 00:13:25 -04:00
select.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	2016-05-19 19:12:14 -07:00
seq_file.c	Make file credentials available to the seqfile interfaces	2016-04-14 12:56:09 -07:00
signalfd.c
splice.c	Merge branch 'ovl-fixes' into for-linus	2016-05-11 00:00:29 -04:00
stack.c
stat.c	fs/stat.c: drop the last new_valid_dev check	2016-01-16 11:17:23 -08:00
statfs.c
super.c	fs/fs-writeback.c: add a new writeback list for sync	2016-07-26 16:19:19 -07:00
sync.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
timerfd.c	timerfd: Reject ALARM timerfds without CAP_WAKE_ALARM	2016-06-09 23:42:38 +02:00
userfaultfd.c	mm: introduce fault_env	2016-07-26 16:19:19 -07:00
utimes.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
xattr.c	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00