Rik van Riel 34e431b0ae /proc/meminfo: provide estimated available memory ... Many load balancing and workload placing programs check /proc/meminfo to estimate how much free memory is available. They generally do this by adding up "free" and "cached", which was fine ten years ago, but is pretty much guaranteed to be wrong today. It is wrong because Cached includes memory that is not freeable as page cache, for example shared memory segments, tmpfs, and ramfs, and it does not include reclaimable slab memory, which can take up a large fraction of system memory on mostly idle systems with lots of files. Currently, the amount of memory that is available for a new workload, without pushing the system into swap, can be estimated from MemFree, Active(file), Inactive(file), and SReclaimable, as well as the "low" watermarks from /proc/zoneinfo. However, this may change in the future, and user space really should not be expected to know kernel internals to come up with an estimate for the amount of free memory. It is more convenient to provide such an estimate in /proc/meminfo. If things change in the future, we only have to change it in one place. Signed-off-by: Rik van Riel <riel@redhat.com> Reported-by: Erik Mouw <erik.mouw_2@nxp.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-01-21 16:19:43 -08:00
..
9p	consolidate simple ->d_delete() instances	2013-11-15 22:04:17 -05:00
adfs
affs	remove obsolete references to powertweak	2013-11-27 20:34:32 -08:00
afs
autofs4
befs
bfs
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2013-12-12 15:25:10 -08:00
cachefiles	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-11-13 15:34:18 +09:00
ceph	ceph: Avoid data inconsistency due to d-cache aliasing in readpage()	2013-12-13 09:11:38 -08:00
cifs	cifs: set FILE_CREATED	2013-12-27 15:14:45 -06:00
coda
configfs	configfs: fix race between dentry put and lookup	2013-11-21 16:42:27 -08:00
cramfs	cramfs: mark as obsolete	2013-11-13 12:09:12 +09:00
debugfs	debugfs: use list_next_entry() in debugfs_remove_recursive()	2013-11-13 12:09:24 +09:00
devpts	devpts: plug the memory leak in kill_sb	2013-11-13 12:09:36 +09:00
dlm	genetlink: only pass array to genl_register_family_with_ops()	2013-11-19 16:39:05 -05:00
ecryptfs	Quiet static checkers by removing unneeded conditionals	2013-11-22 10:58:14 -08:00
efivarfs	consolidate simple ->d_delete() instances	2013-11-15 22:04:17 -05:00
efs
exofs
exportfs
ext2	ext2: Fix oops in ext2_get_block() called from ext2_quota_write()	2013-12-04 12:26:51 +01:00
ext3	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2013-11-13 15:25:47 +09:00
ext4	ext4: fix bigalloc regression	2014-01-06 14:00:23 -05:00
f2fs
fat
freevxfs
fscache	Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block	2013-11-14 12:08:14 +09:00
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-11-13 15:34:18 +09:00
gfs2	GFS2: Fix unsafe dereference in dump_holder()	2014-01-02 12:18:04 +00:00
hfs	fs/hfs/btree.h: remove duplicate defines	2013-11-13 12:09:32 +09:00
hfsplus	block: submit_bio_wait() conversions	2013-11-24 16:33:41 -07:00
hostfs	consolidate simple ->d_delete() instances	2013-11-15 22:04:17 -05:00
hpfs
hppfs
hugetlbfs
isofs
jbd
jbd2	jbd2: rename obsoleted msg JBD->JBD2	2013-12-08 21:14:59 -05:00
jffs2
jfs
kernfs	kernfs: associate a new kernfs_node with its parent on creation	2014-01-17 11:50:07 -08:00
lockd
logfs	block: submit_bio_wait() conversions	2013-11-24 16:33:41 -07:00
minix
ncpfs
nfs	NFS client bugfixes	2013-12-05 13:05:48 -08:00
nfs_common
nfsd	nfsd: when reusing an existing repcache entry, unhash it first	2013-12-10 20:34:44 -05:00
nilfs2	nilfs2: fix segctor bug that causes file system corruption	2014-01-15 14:19:42 +07:00
nls
notify	fsnotify: remove pointless NULL initializers	2014-01-21 16:19:41 -08:00
ntfs
ocfs2	ocfs2: fix NULL pointer dereference when dismount and ocfs2rec simultaneously	2014-01-21 16:19:42 -08:00
omfs
openpromfs
proc	/proc/meminfo: provide estimated available memory	2014-01-21 16:19:43 -08:00
pstore	pstore: Don't allow high traffic options on fragile devices	2013-12-20 13:12:01 -08:00
qnx4
qnx6
quota	genetlink: make multicast groups const, prevent abuse	2013-11-19 16:39:06 -05:00
ramfs	fs/ramfs: don't use module_init for non-modular core code	2014-01-21 16:19:42 -08:00
reiserfs
romfs
squashfs	Squashfs: fix failure to unlock pages on decompress error	2013-11-24 01:02:50 +00:00
sysfs	Revert "kernfs, sysfs, driver-core: implement kernfs_remove_self() and its wrappers"	2014-01-13 14:05:13 -08:00
sysv
ubifs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-11-13 15:34:18 +09:00
udf
ufs
xfs	xfs: Calling destroy_work_on_stack() to pair with INIT_WORK_ONSTACK()	2014-01-10 12:39:38 -06:00
aio.c	Merge git://git.kvack.org/~bcrl/aio-next	2013-12-22 11:03:49 -08:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c	bio: fix argument of __bio_add_page() for max_sectors > 0xffff	2013-11-18 12:31:27 -07:00
block_dev.c
buffer.c
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_binfmt_elf.c
compat_ioctl.c	fs/compat_ioctl.c: fix an underflow issue (harmless)	2014-01-21 16:19:42 -08:00
compat.c
coredump.c	dump_emit(): use __kernel_write(), not vfs_write()	2013-11-15 22:04:09 -05:00
coredump.h
dcache.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2014-01-17 17:29:36 -08:00
dcookies.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c	epoll: do not take the nested ep->mtx on EPOLL_CTL_DEL	2014-01-02 14:40:30 -08:00
exec.c	Merge git://git.infradead.org/users/eparis/audit	2013-11-21 19:18:14 -08:00
fcntl.c
fhandle.c
file_table.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
file.c
filesystems.c
fs_struct.c
fs-writeback.c	writeback: Fix data corruption on NFS	2013-12-14 04:21:26 +08:00
generic_acl.c
inode.c
internal.h
ioctl.c
ioprio.c
Kconfig
Kconfig.binfmt
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
Makefile	sysfs, kernfs: add skeletons for kernfs	2013-11-27 13:28:24 -08:00
mbcache.c
mount.h
mpage.c
namei.c	dcache: allow word-at-a-time name hashing with big-endian CPUs	2013-12-12 10:39:01 -08:00
namespace.c	Driver core / sysfs patches for 3.14-rc1	2014-01-20 15:49:44 -08:00
no-block.c
open.c
pipe.c	vfs: fix subtle use-after-free of pipe_inode_info	2013-12-02 09:44:51 -08:00
pnode.c
pnode.h
posix_acl.c	posix_acl: uninlining	2014-01-21 16:19:42 -08:00
proc_namespace.c
read_write.c	fs/read_write.c:compat_readv(): remove bogus area verify	2014-01-21 16:19:42 -08:00
readdir.c
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
splice.c
stack.c
stat.c
statfs.c
super.c	fs/super.c: fix WARN on alloc_super() fail path	2014-01-21 16:19:42 -08:00
sync.c	Merge branch 'akpm' (patches from Andrew Morton)	2013-11-13 15:45:43 +09:00
timerfd.c
utimes.c
xattr_acl.c
xattr.c