Mel Gorman c33d6c06f6 mm, page_alloc: avoid looking up the first zone in a zonelist twice ... The allocator fast path looks up the first usable zone in a zonelist and then get_page_from_freelist does the same job in the zonelist iterator. This patch preserves the necessary information. 4.6.0-rc2 4.6.0-rc2 fastmark-v1r20 initonce-v1r20 Min alloc-odr0-1 364.00 ( 0.00%) 359.00 ( 1.37%) Min alloc-odr0-2 262.00 ( 0.00%) 260.00 ( 0.76%) Min alloc-odr0-4 214.00 ( 0.00%) 214.00 ( 0.00%) Min alloc-odr0-8 186.00 ( 0.00%) 186.00 ( 0.00%) Min alloc-odr0-16 173.00 ( 0.00%) 173.00 ( 0.00%) Min alloc-odr0-32 165.00 ( 0.00%) 165.00 ( 0.00%) Min alloc-odr0-64 161.00 ( 0.00%) 162.00 ( -0.62%) Min alloc-odr0-128 159.00 ( 0.00%) 161.00 ( -1.26%) Min alloc-odr0-256 168.00 ( 0.00%) 170.00 ( -1.19%) Min alloc-odr0-512 180.00 ( 0.00%) 181.00 ( -0.56%) Min alloc-odr0-1024 190.00 ( 0.00%) 190.00 ( 0.00%) Min alloc-odr0-2048 196.00 ( 0.00%) 196.00 ( 0.00%) Min alloc-odr0-4096 202.00 ( 0.00%) 202.00 ( 0.00%) Min alloc-odr0-8192 206.00 ( 0.00%) 205.00 ( 0.49%) Min alloc-odr0-16384 206.00 ( 0.00%) 205.00 ( 0.49%) The benefit is negligible and the results are within the noise but each cycle counts. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-05-19 19:12:14 -07:00
..
9p	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
adfs	fs/adfs/adfs.h: tidy up comments	2016-01-20 17:09:18 -08:00
affs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
afs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2016-05-17 16:26:30 -07:00
autofs4	dcache_{readdir,dir_lseek}() users: switch to ->iterate_shared	2016-05-02 19:49:32 -04:00
befs	befs: switch to ->iterate_shared()	2016-05-10 14:24:57 -04:00
bfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
btrfs	Merge branch 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:28:45 -07:00
cachefiles	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ceph	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:08:45 -07:00
cifs	Merge branch 'sendmsg.cifs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:17:56 -07:00
coda	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
configfs	configfs_readdir(): make safe under shared lock	2016-05-09 11:41:13 -04:00
cramfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
crypto	ext4/fscrypto: avoid RCU lookup in d_revalidate	2016-04-12 20:01:35 -07:00
debugfs	debugfs: Make automount point inodes permanently empty	2016-04-12 15:01:53 -07:00
devpts	devpts: more pty driver interface cleanups	2016-04-26 15:47:32 -07:00
dlm	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ecryptfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:51:59 -07:00
efivarfs	efivarfs: Make efivarfs_file_ioctl() static	2016-05-07 07:06:13 +02:00
efs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
exofs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2016-05-17 17:05:30 -07:00
exportfs	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
ext2	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
ext4	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
f2fs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
fat	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
freevxfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
fscache	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fuse	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
gfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:08:45 -07:00
hfs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
hfsplus	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
hostfs	hostfs: switch to ->iterate_shared()	2016-05-12 19:49:30 -04:00
hpfs	hpfs: switch to ->iterate_shared()	2016-05-12 19:47:13 -04:00
hugetlbfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
isofs	Merge branch 'ovl-fixes' into for-linus	2016-05-11 00:00:29 -04:00
jbd2	Merge branch 'master' into for-next	2016-04-18 11:18:55 +02:00
jffs2	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
jfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:08:45 -07:00
kernfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 11:01:31 -07:00
lockd	lockd: constify nlmsvc_binding structure	2016-01-07 10:10:50 -05:00
logfs	logfs: no need to lock directory in lseek	2016-05-09 11:42:19 -04:00
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 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
nfs_common	…
nfsd	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
nilfs2	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
nls	…
notify	fsnotify: avoid spurious EMFILE errors from inotify_init()	2016-05-19 19:12:14 -07:00
ntfs	fs: simplify the generic_write_sync prototype	2016-05-01 19:58:39 -04:00
ocfs2	ocfs2: clean up an unneeded goto in ocfs2_put_slot()	2016-05-19 19:12:14 -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	orangefs: don't open-code inode_lock/inode_unlock	2016-05-02 19:47:23 -04:00
overlayfs	Merge branch 'ovl-fixes' into for-linus	2016-05-17 02:17:59 -04:00
proc	mm: rename _count, field of the struct page, to _refcount	2016-05-19 19:12:14 -07:00
pstore	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -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	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
reiserfs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
romfs	romfs, squashfs: switch to ->iterate_shared()	2016-05-09 11:41:15 -04:00
squashfs	romfs, squashfs: switch to ->iterate_shared()	2016-05-09 11:41:15 -04:00
sysfs	platform/chrome: Branch for v4.4	2015-11-13 21:53:18 -08:00
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	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:08:45 -07:00
udf	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
ufs	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
xfs	Merge branch 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 10:28:45 -07:00
Kconfig	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	2016-03-26 12:59:04 -07:00
Kconfig.binfmt	…
Makefile	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	2016-03-26 12:59:04 -07:00
aio.c	aio: remove a pointless assignment	2016-04-03 19:51:33 -04:00
anon_inodes.c	…
attr.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
bad_inode.c	->getxattr(): pass dentry and inode as separate arguments	2016-04-11 00:48:00 -04:00
binfmt_aout.c	…
binfmt_elf.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:51:59 -07:00
binfmt_elf_fdpic.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:51:59 -07:00
binfmt_em86.c	…
binfmt_flat.c	…
binfmt_misc.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
binfmt_script.c	…
block_dev.c	fs: simplify the generic_write_sync prototype	2016-05-01 19:58:39 -04:00
buffer.c	mm, page_alloc: avoid looking up the first zone in a zonelist twice	2016-05-19 19:12:14 -07:00
char_dev.c	…
compat.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	2016-05-02 19:49:28 -04:00
compat_binfmt_elf.c	…
compat_ioctl.c	Merge 4.5-rc4 into char-misc-next	2016-02-14 14:25:59 -08:00
coredump.c	coredump: only charge written data against RLIMIT_CORE	2016-05-12 16:55:50 -04:00
dax.c	direct-io: eliminate the offset argument to ->direct_IO	2016-05-01 19:58:39 -04:00
dcache.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:51:59 -07:00
dcookies.c	…
direct-io.c	fs: simplify the generic_write_sync prototype	2016-05-01 19:58:39 -04:00
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: clarify reasoning for euid/egid reset	2016-05-17 13:56:53 -07:00
fcntl.c	fcntl: allow to set O_DIRECT flag on pipe	2016-01-09 02:55:37 -05:00
fhandle.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
file.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	2016-05-02 19:49:28 -04:00
file_table.c	…
filesystems.c	find_filesystem(): simplify comparison	2016-01-19 12:02:23 -05:00
fs-writeback.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fs_pin.c	…
fs_struct.c	…
inode.c	parallel lookups: actual switch to rwsem	2016-05-02 19:49:28 -04:00
internal.h	Merge branch 'for-linus' into work.misc	2016-01-08 21:20:11 -05:00
ioctl.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
libfs.c	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
locks.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
mbcache.c	mbcache: add reusable flag to cache entries	2016-02-22 22:44:04 -05:00
mount.h	…
mpage.c	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
namei.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
namespace.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
no-block.c	…
nsfs.c	fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void	2015-09-11 15:21:34 -07:00
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	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -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	xattr_handler: pass dentry and inode as separate arguments of ->get()	2016-04-10 20:48:24 -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	Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:46:23 -07:00
readdir.c	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -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	Merge branch 'master' into for-next	2016-04-18 11:18:55 +02:00
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: Handle relative timers with CONFIG_TIME_LOW_RES proper	2016-01-17 11:13:55 +01:00
userfaultfd.c	userfaultfd: don't block on the last VM updates at exit time	2016-03-02 09:03:18 -08:00
utimes.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
xattr.c	->getxattr(): pass dentry and inode as separate arguments	2016-04-11 00:48:00 -04:00