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Vladimir Davydov 49e7e7ff8d fs: shrinker: always scan at least one object of each type 
In super_cache_scan() we divide the number of objects of particular type
by the total number of objects in order to distribute pressure among As a
result, in some corner cases we can get nr_to_scan=0 even if there are
some objects to reclaim, e.g.  dentries=1, inodes=1, fs_objects=1,
nr_to_scan=1/3=0.

This is unacceptable for per memcg kmem accounting, because this means
that some objects may never get reclaimed after memcg death, preventing it
from being freed.

This patch therefore assures that super_cache_scan() will scan at least
one object of each type if any.

[akpm@linux-foundation.org: add comment]
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-12 18:54:09 -08:00
..
9p
mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
2015-02-10 14:30:30 -08:00
adfs
adfs: add __printf verification, fix format/argument mismatches
2014-08-08 15:57:24 -07:00
affs
fs/affs/file.c: remove obsolete pagesize check
2014-12-13 12:42:52 -08:00
afs
rxrpc: make the users of rxrpc_kernel_send_data() set kvec-backed msg_iter properly
2015-02-04 01:34:14 -05:00
autofs4
assorted conversions to %p[dD]
2014-11-19 13:01:20 -05:00
befs
befs: remove dead code
2014-12-13 12:42:51 -08:00
bfs
fs/bfs: use bfs prefix for dump_imap
2014-08-08 15:57:24 -07:00
btrfs
page_writeback: put account_page_redirty() after set_page_dirty()
2015-02-11 17:06:04 -08:00
cachefiles
assorted conversions to %p[dD]
2014-11-19 13:01:20 -05:00
ceph
Merge branch 'akpm' (patches from Andrew)
2015-02-10 16:45:56 -08:00
cifs
Merge branch 'akpm' (patches from Andrew)
2015-02-10 16:45:56 -08:00
coda
coda_venus_readdir(): use file_inode()
2014-12-11 16:28:12 -05:00
configfs
assorted conversions to %p[dD]
2014-11-19 13:01:20 -05:00
cramfs
fs/cramfs/inode.c: use linux/uaccess.h
2014-08-08 15:57:25 -07:00
debugfs
Driver core patches for 3.19-rc1
2014-12-14 16:10:09 -08:00
devpts
fs/devpts/inode.c: convert printk to pr_foo()
2014-06-06 16:08:14 -07:00
dlm
netlink: make nlmsg_end() and genlmsg_end() void
2015-01-18 01:03:45 -05:00
ecryptfs
Fixes for filename decryption and encrypted view plus a cleanup
2014-12-19 18:15:12 -08:00
efivarfs
* Move efivarfs from the misc filesystem section to pseudo filesystem,
2015-01-29 19:16:40 +01:00
efs
fs/efs/namei.c: return is not a function
2014-08-08 15:57:18 -07:00
exofs
Boaz Harrosh - Fix broken email address
2014-10-19 20:22:32 +03:00
exportfs
move d_rcu from overlapping d_child to overlapping d_alias
2014-11-03 15:20:29 -05:00
ext2
ext2: Convert to private i_dquot field
2014-11-10 10:06:10 +01:00
ext3
ext3: destroy sbi mutexes in put_super
2015-01-05 11:13:55 +01:00
ext4
Merge branch 'akpm' (patches from Andrew)
2015-02-10 16:45:56 -08:00
f2fs
mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
2015-02-10 14:30:30 -08:00
fat
fat: fix data past EOF resulting from fsx testsuite
2014-12-13 12:42:51 -08:00
freevxfs
Major changes for 3.14 include support for the newly added ZERO_RANGE
2014-04-04 15:39:39 -07:00
fscache
fs/fscache/object-list.c: use __seq_open_private()
2014-10-13 17:52:21 +01:00
fuse
mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
2015-02-10 14:30:30 -08:00
gfs2
list_lru: introduce list_lru_shrink_{count,walk}
2015-02-12 18:54:08 -08:00
hfs
fs/hfs/catalog.c: fix comparison bug in hfs_cat_keycmp
2014-12-10 17:41:16 -08:00
hfsplus
hfsplus: fix longname handling
2014-12-18 19:08:10 -08:00
hostfs
hostfs: support rename flags
2014-08-07 14:40:09 -04:00
hpfs
fs/hpfs/dnode.c: fix suspect code indent
2014-08-08 15:57:22 -07:00
hppfs
vfs: make first argument of dir_context.actor typed
2014-10-31 17:48:54 -04:00
hugetlbfs
mm: convert i_mmap_mutex to rwsem
2014-12-13 12:42:45 -08:00
isofs
isofs: Fix bug in the way to check if the year is a leap year
2015-01-07 09:51:49 +01:00
jbd
jbd: Deletion of an unnecessary check before the function call "iput"
2014-11-18 10:15:29 +01:00
jbd2
Lots of bugs fixes, including Zheng and Jan's extent status shrinker
2014-12-12 09:28:03 -08:00
jffs2
jffs2: Drop bogus if in comment
2014-11-28 18:23:44 -08:00
jfs
jfs: Deletion of an unnecessary check before the function call "unload_nls"
2015-02-02 15:02:34 -06:00
kernfs
kernfs: Fix kernfs_name_compare
2015-01-09 15:51:08 -08:00
lockd
Merge branch 'for-3.20' of git://linux-nfs.org/~bfields/linux
2015-02-12 10:39:41 -08:00
logfs
fs/logfs/readwrite.c: kernel-doc warning fixes
2014-08-06 18:01:12 -07:00
minix
minix zmap block counts calculation fix
2014-08-08 15:57:20 -07:00
ncpfs
Merge branch 'akpm' (patchbomb from Andrew)
2014-12-10 18:34:42 -08:00
nfs
NFS client updates for Linux 3.20
2015-02-11 17:14:54 -08:00
nfs_common
lockd: move lockd's grace period handling into its own module
2014-09-17 16:33:11 -04:00
nfsd
nfsd: default NFSv4.2 to on
2015-02-09 14:58:50 -05:00
nilfs2
mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
2015-02-10 14:30:30 -08:00
nls
nls: have register_nls() set ->owner
2014-01-25 03:14:05 -05:00
notify
fanotify: don't set FAN_ONDIR implicitly on a marks ignored mask
2015-02-10 14:30:28 -08:00
ntfs
assorted conversions to %p[dD]
2014-11-19 13:01:20 -05:00
ocfs2
Merge branch 'akpm' (patches from Andrew)
2015-02-10 16:45:56 -08:00
omfs
FS/OMFS: block number sanity check during fill_super operation
2014-10-14 02:18:22 +02:00
openpromfs
fs: push sync_filesystem() down to the file system's remount_fs()
2014-03-13 10:14:33 -04:00
overlayfs
Merge branch 'iov_iter' into for-next
2014-12-08 20:39:29 -05:00
proc
mm: /proc/pid/clear_refs: avoid split_huge_page()
2015-02-11 17:06:06 -08:00
pstore
pstore: Fix sprintf format specifier in pstore_dump()
2015-01-16 16:01:29 -08:00
qnx4
fs: push sync_filesystem() down to the file system's remount_fs()
2014-03-13 10:14:33 -04:00
qnx6
fs/qnx6: update debugging to current functions
2014-08-08 15:57:26 -07:00
quota
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2015-02-10 15:52:38 -08:00
ramfs
fs/ramfs/file-nommu.c: replace count*size kzalloc by kcalloc
2014-08-08 15:57:18 -07:00
reiserfs
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2014-12-16 15:46:01 -08:00
romfs
fs/romfs/super.c: add blank line after declarations
2014-08-08 15:57:25 -07:00
squashfs
Squashfs: Add LZ4 compression configuration option
2014-11-27 18:48:44 +00:00
sysfs
sysfs/kernfs: make read requests on pre-alloc files use the buffer.
2014-11-07 10:54:38 -08:00
sysv
write_iter variants of {__,}generic_file_aio_write()
2014-05-06 17:38:00 -04:00
ubifs
mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub
2015-02-10 14:30:30 -08:00
udf
udf: remove bool assignment to 0/1
2015-02-05 16:34:25 +01:00
ufs
fs/ufs/balloc.c: remove unused variable
2014-10-14 02:18:20 +02:00
xfs
fs: consolidate {nr,free}_cached_objects args in shrink_control
2015-02-12 18:54:08 -08:00
aio.c
aio: annotate aio_read_event_ring for sleep patterns
2015-02-03 19:29:05 -05:00
anon_inodes.c
vfs: Allocate anon_inode_inode in anon_inode_init()
2014-03-27 09:52:54 -07:00
attr.c
fs,userns: Change inode_capable to capable_wrt_inode_uidgid
2014-06-10 13:57:22 -07:00
bad_inode.c
bad_inode: add ->rename2()
2014-08-07 14:40:09 -04:00
binfmt_aout.c
assorted conversions to %p[dD]
2014-11-19 13:01:20 -05:00
binfmt_elf_fdpic.c
handle suicide on late failure exits in execve() in search_binary_handler()
2014-10-09 02:39:00 -04:00
binfmt_elf.c
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
2014-12-11 17:56:37 -08:00
binfmt_em86.c
syscalls: implement execveat() system call
2014-12-13 12:42:51 -08:00
binfmt_flat.c
fs/binfmt_flat.c: make old_reloc() static
2014-06-04 16:54:21 -07:00
binfmt_misc.c
unfuck binfmt_misc.c (broken by commit e6084d4)
2014-12-17 08:27:14 -05:00
binfmt_script.c
syscalls: implement execveat() system call
2014-12-13 12:42:51 -08:00
binfmt_som.c
…
block_dev.c
fs: add freeze_super/thaw_super fs hooks
2014-11-17 10:35:17 +00:00
buffer.c
fs: clarify rate limit suppressed buffer I/O errors
2014-10-21 13:55:11 -06:00
char_dev.c
fs/char_dev.c: remove pointless assignment from __register_chrdev_region()
2014-12-10 17:41:04 -08:00
compat_binfmt_elf.c
binfmt_elf: add ELF_HWCAP2 to compat auxv entries
2014-03-04 08:05:21 +00:00
compat_ioctl.c
Bluetooth: Move HCI socket definitions into its own header file
2014-07-11 13:53:04 +03:00
compat.c
vfs: make first argument of dir_context.actor typed
2014-10-31 17:48:54 -04:00
coredump.c
coredump: add %i/%I in core_pattern to report the tid of the crashed thread
2014-10-14 02:18:21 +02:00
dcache.c
list_lru: introduce list_lru_shrink_{count,walk}
2015-02-12 18:54:08 -08:00
dcookies.c
fs/compat: fix lookup_dcookie() parameter handling
2014-01-29 16:22:40 -08:00
direct-io.c
fuse: honour max_read and max_write in direct_io mode
2014-09-26 21:16:51 -04:00
drop_caches.c
vmscan: per memory cgroup slab shrinkers
2015-02-12 18:54:09 -08:00
eventfd.c
fs: Convert show_fdinfo functions to void
2014-11-05 14:13:23 -05:00
eventpoll.c
fs: Convert show_fdinfo functions to void
2014-11-05 14:13:23 -05:00
exec.c
syscalls: implement execveat() system call
2014-12-13 12:42:51 -08:00
fcntl.c
vfs: renumber FMODE_NONOTIFY and add to uniqueness check
2015-01-08 15:10:52 -08:00
fhandle.c
…
file_table.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-10-13 11:28:42 +02:00
file.c
fs/file.c: replace get_unused_fd() with get_unused_fd_flags(0)
2014-12-10 17:41:10 -08:00
filesystems.c
sys_sysfs: Add CONFIG_SYSFS_SYSCALL
2014-04-03 16:21:05 -07:00
fs_pin.c
make fs/{namespace,super}.c forget about acct.h
2014-08-07 14:40:09 -04:00
fs_struct.c
…
fs-writeback.c
writeback: fix a subtle race condition in I_DIRTY clearing
2014-11-04 10:42:23 -07:00
inode.c
list_lru: introduce list_lru_shrink_{count,walk}
2015-02-12 18:54:08 -08:00
internal.h
list_lru: introduce list_lru_shrink_{count,walk}
2015-02-12 18:54:08 -08:00
ioctl.c
fsioctl.c: make generic_block_fiemap() signal-tolerant
2015-02-10 14:30:30 -08:00
Kconfig
fs: Make efivarfs a pseudo filesystem, built by default with EFI
2015-01-05 14:15:58 +00:00
Kconfig.binfmt
binfmt_elf: allow arch code to examine PT_LOPROC ... PT_HIPROC headers
2014-11-24 07:45:02 +01:00
libfs.c
move d_rcu from overlapping d_child to overlapping d_alias
2014-11-03 15:20:29 -05:00
locks.c
fs: add FL_LAYOUT lease type
2015-02-02 18:09:38 +01:00
Makefile
Merge branch 'nsfs' into for-next
2014-12-10 21:31:59 -05:00
mbcache.c
fs/mbcache: replace __builtin_log2() with ilog2()
2014-06-25 22:08:29 -04:00
mount.h
common object embedded into various struct ....ns
2014-12-04 14:31:00 -05:00
mpage.c
vfs: guard end of device for mpage interface
2014-10-09 22:25:53 -04:00
namei.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-12-16 15:53:03 -08:00
namespace.c
mnt: Fix a memory stomp in umount
2014-12-18 11:22:02 -08:00
no-block.c
…
nsfs.c
take the targets of /proc/*/ns/* symlinks to separate fs
2014-12-10 21:30:20 -05:00
open.c
Merge branch 'for-3.19' of git://linux-nfs.org/~bfields/linux
2014-12-16 15:25:31 -08:00
pipe.c
new helper: copy_page_from_iter()
2014-05-06 17:39:42 -04:00
pnode.c
mnt: Move the clear of MNT_LOCKED from copy_tree to it's callers.
2014-12-02 10:46:50 -06:00
pnode.h
smarter propagate_mnt()
2014-04-01 23:19:08 -04:00
posix_acl.c
posix_acl: handle NULL ACL in posix_acl_equiv_mode
2014-05-06 13:58:42 -04:00
proc_namespace.c
vfs: make mounts and mountstats honor root dir like mountinfo does
2014-12-17 08:27:15 -05:00
read_write.c
locks: convert posix locks to file_lock_context
2015-01-16 16:08:16 -05:00
readdir.c
vfs: make first argument of dir_context.actor typed
2014-10-31 17:48:54 -04:00
select.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-11-13 15:34:18 +09:00
seq_file.c
fs, seq_file: fallback to vmalloc instead of oom kill processes
2014-12-13 12:42:49 -08:00
signalfd.c
fs: Convert show_fdinfo functions to void
2014-11-05 14:13:23 -05:00
splice.c
vfs: export do_splice_direct() to modules
2014-10-24 00:14:35 +02:00
stack.c
fs: fix comment for 'CONFIG_LBADF'
2014-08-26 09:35:56 +02:00
stat.c
vfs: split out vfs_getattr_nosec
2013-11-09 00:16:31 -05:00
statfs.c
…
super.c
fs: shrinker: always scan at least one object of each type
2015-02-12 18:54:09 -08:00
sync.c
kill f_dentry uses
2014-11-19 13:01:25 -05:00
timerfd.c
fs: Convert show_fdinfo functions to void
2014-11-05 14:13:23 -05:00
utimes.c
locks: break delegations on any attribute modification
2013-11-09 00:16:44 -05:00
xattr.c
new helper: audit_file()
2014-11-19 13:01:26 -05:00