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Dave Hansen 5509a5d27b drop_caches: add some documentation and info message 
There is plenty of anecdotal evidence and a load of blog posts
suggesting that using "drop_caches" periodically keeps your system
running in "tip top shape".  Perhaps adding some kernel documentation
will increase the amount of accurate data on its use.

If we are not shrinking caches effectively, then we have real bugs.
Using drop_caches will simply mask the bugs and make them harder to
find, but certainly does not fix them, nor is it an appropriate
"workaround" to limit the size of the caches.  On the contrary, there
have been bug reports on issues that turned out to be misguided use of
cache dropping.

Dropping caches is a very drastic and disruptive operation that is good
for debugging and running tests, but if it creates bug reports from
production use, kernel developers should be aware of its use.

Add a bit more documentation about it, a syslog message to track down
abusers, and vmstat drop counters to help analyze problem reports.

[akpm@linux-foundation.org: checkpatch fixes]
[hannes@cmpxchg.org: add runtime suppression control]
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2014-04-03 16:21:04 -07:00
..
9p mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
adfs adfs: delayed freeing of sbi 2013-10-24 23:43:27 -04:00
affs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
afs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
autofs4 autofs: fix symlinks aren't checked for expiry 2014-01-23 16:36:59 -08:00
befs befs: iget_locked() doesn't return an ERR_PTR 2014-01-25 03:14:38 -05:00
bfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
btrfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
cachefiles fs: cachefiles: use add_to_page_cache_lru() 2014-04-03 16:21:00 -07:00
ceph ceph: fix __dcache_readdir() 2014-02-17 12:37:13 -08:00
cifs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
coda mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
configfs configfs: fix race between dentry put and lookup 2013-11-21 16:42:27 -08:00
cramfs mm: remove read_cache_page_async() 2014-04-03 16:21:04 -07:00
debugfs treewide: Fix typo in Documentation/DocBook 2014-02-19 14:58:17 +01:00
devpts devpts: plug the memory leak in kill_sb 2013-11-13 12:09:36 +09:00
dlm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
ecryptfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
efivarfs efivarfs: 'efivarfs_file_write' function reorganization 2014-03-04 16:16:16 +00:00
efs efs: get rid of ->put_super() 2014-01-25 03:13:02 -05:00
exofs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
exportfs exportfs: fix quadratic behavior in filehandle lookup 2013-11-09 00:16:38 -05:00
ext2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ext3 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ext4 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
f2fs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
fat mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
freevxfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
fscache FS-Cache: Handle removal of unadded object to the fscache_object_list rb tree 2014-02-17 13:47:35 -08:00
fuse mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
gfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hfsplus mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hostfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hpfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hppfs
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hugetlbfs mm, hugetlb: unify region structure handling 2014-04-03 16:20:59 -07:00
isofs isofs: don't pass dentry to isofs_hash{i,}_common() 2013-10-24 23:34:59 -04:00
jbd jbd: Revise KERN_EMERG error messages 2013-12-04 12:27:46 +01:00
jbd2 jbd2: fix use after free in jbd2_journal_start_reserved() 2014-02-17 20:33:01 -05:00
jffs2 mm: remove read_cache_page_async() 2014-04-03 16:21:04 -07:00
jfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
kernfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
lockd lockd: send correct lock when granting a delayed lock. 2014-02-13 14:55:02 -05:00
logfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
minix mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ncpfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nfs_common
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nfsd nfsd: fix lost nfserrno() call in nfsd_setattr() 2014-02-18 12:25:57 -05:00
nilfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nls nls: have register_nls() set ->owner 2014-01-25 03:14:05 -05:00
notify fanotify: move unrelated handling from copy_event_to_user() 2014-04-03 16:20:51 -07:00
ntfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ocfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
omfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
openpromfs
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proc mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
pstore pstore: Don't allow high traffic options on fragile devices 2013-12-20 13:12:01 -08:00
qnx4 qnx4: clean qnx4_fill_super() up 2014-01-25 03:13:03 -05:00
qnx6
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quota quota: provide function to grab quota structure reference 2014-04-03 16:20:54 -07:00
ramfs fs/ramfs: move ramfs_aops to inode.c 2014-01-23 16:36:58 -08:00
reiserfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
romfs romfs: fix returm err while getting inode in fill_super 2014-01-23 16:37:04 -08:00
squashfs Squashfs: fix failure to unlock pages on decompress error 2013-11-24 01:02:50 +00:00
sysfs Revert "sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()" 2014-03-25 20:54:57 -07:00
sysv mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ubifs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
udf mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ufs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
xfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
Kconfig kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
Kconfig.binfmt
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Makefile kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
aio.c Merge git://git.kvack.org/~bcrl/aio-next 2013-12-22 11:03:49 -08:00
anon_inodes.c vfs: Allocate anon_inode_inode in anon_inode_init() 2014-03-27 09:52:54 -07:00
attr.c fs: fix iversion handling 2013-12-05 16:36:21 -06:00
bad_inode.c
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binfmt_aout.c dump_skip(): dump_seek() replacement taking coredump_params 2013-11-09 00:16:26 -05:00
binfmt_elf.c fs: binfmt_elf: remove unused defines INTERPRETER_NONE and INTERPRETER_ELF 2014-01-23 16:36:58 -08:00
binfmt_elf_fdpic.c elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo) 2013-11-09 00:16:30 -05:00
binfmt_em86.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
binfmt_flat.c
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binfmt_misc.c
…
binfmt_script.c
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binfmt_som.c
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bio-integrity.c Merge branch 'for-3.15/core' of git://git.kernel.dk/linux-block 2014-04-01 19:19:15 -07:00
bio.c bio: don't write "bio: create slab" messages to syslog 2014-02-18 12:17:47 -08:00
block_dev.c mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
buffer.c Merge branch 'master' into for-next 2014-02-20 14:54:28 +01:00
char_dev.c Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block 2013-11-14 12:08:14 +09:00
compat.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-02 12:51:41 -07:00
compat_binfmt_elf.c binfmt_elf: add ELF_HWCAP2 to compat auxv entries 2014-03-04 08:05:21 +00:00
compat_ioctl.c fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types 2014-03-06 16:30:44 +01:00
coredump.c coredump: make __get_dumpable/get_dumpable inline, kill fs/coredump.h 2014-01-23 16:37:01 -08:00
dcache.c make prepend_name() work correctly when called with negative *buflen 2014-03-23 00:28:40 -04:00
dcookies.c fs/compat: fix lookup_dcookie() parameter handling 2014-01-29 16:22:40 -08:00
direct-io.c fs/direct-io.c: remove redundant comparison 2014-04-03 16:20:57 -07:00
drop_caches.c drop_caches: add some documentation and info message 2014-04-03 16:21:04 -07:00
eventfd.c eventfd_ctx_fdget(): use fdget() instead of fget() 2014-01-25 03:13:04 -05:00
eventpoll.c epoll: do not take the nested ep->mtx on EPOLL_CTL_DEL 2014-01-02 14:40:30 -08:00
exec.c fs/compat: convert to COMPAT_SYSCALL_DEFINE 2014-03-06 16:30:43 +01:00
fcntl.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
fhandle.c
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file.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-03-31 11:05:24 -07:00
file_table.c vfs: atomic f_pos accesses as per POSIX 2014-03-10 11:44:41 -04:00
filesystems.c
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fs-writeback.c bdi: avoid oops on device removal 2014-04-03 16:20:49 -07:00
fs_struct.c seqcount: Add lockdep functionality to seqcount/seqlock structures 2013-11-06 12:40:26 +01:00
inode.c mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
internal.h get rid of s_files and files_lock 2013-11-09 00:16:20 -05:00
ioctl.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
ioprio.c
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libfs.c consolidate simple ->d_delete() instances 2013-11-15 22:04:17 -05:00
locks.c locks: missing unlock on error in generic_add_lease() 2013-11-13 07:30:53 -05:00
mbcache.c
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mount.h switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
mpage.c block: Abstract out bvec iterator 2013-11-23 22:33:47 -08:00
namei.c rcuwalk: recheck mount_lock after mountpoint crossing attempts 2014-03-23 00:32:55 -04:00
namespace.c switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
no-block.c
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open.c vfs: atomic f_pos accesses as per POSIX 2014-03-10 11:44:41 -04:00
pipe.c fs/pipe.c: skip file_update_time on frozen fs 2014-01-23 16:37:00 -08:00
pnode.c switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
pnode.h switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
posix_acl.c fs: get_acl() must be allowed to return EOPNOTSUPP 2014-02-03 17:12:37 -05:00
proc_namespace.c fs/proc_namespace.c: simplify testing nsp and nsp->mnt_ns 2014-01-23 16:37:02 -08:00
read_write.c Merge branch 'compat' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-03-31 14:32:17 -07:00
readdir.c file->f_op is never NULL... 2013-10-24 23:34:54 -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 seq_file: always clear m->count when we free m->buf 2013-11-18 19:07:53 -08:00
signalfd.c
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splice.c fuse: fix pipe_buf_operations 2014-01-22 19:36:57 +01:00
stack.c
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stat.c vfs: split out vfs_getattr_nosec 2013-11-09 00:16:31 -05:00
statfs.c vfs: allow O_PATH file descriptors for fstatfs() 2013-10-12 13:12:31 -07:00
super.c fs/super.c: sync ro remount after blocking writers 2014-01-31 14:29:36 -05:00
sync.c Revert "writeback: do not sync data dirtied after sync start" 2014-02-22 02:02:28 +01:00
timerfd.c timerfd: support CLOCK_BOOTTIME clock 2014-01-23 16:57:40 -08:00
utimes.c locks: break delegations on any attribute modification 2013-11-09 00:16:44 -05:00
xattr.c
…