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e30b5dca15dea86aa697f9d58ff646294fe80d3d
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Yan, Zheng e30b5dca15 ext4: fix fio regression 
We (Linux Kernel Performance project) found a regression introduced
by commit:

  f7fec032aa ext4: track all extent status in extent status tree

The commit causes about 20% performance decrease in fio random write
test. Profiler shows that rb_next() uses a lot of CPU time. The call
stack is:

  rb_next
  ext4_es_find_delayed_extent
  ext4_map_blocks
  _ext4_get_block
  ext4_get_block_write
  __blockdev_direct_IO
  ext4_direct_IO
  generic_file_direct_write
  __generic_file_aio_write
  ext4_file_write
  aio_rw_vect_retry
  aio_run_iocb
  do_io_submit
  sys_io_submit
  system_call_fastpath
  io_submit
  td_io_getevents
  io_u_queued_complete
  thread_main
  main
  __libc_start_main

The cause is that ext4_es_find_delayed_extent() doesn't have an
upper bound, it keeps searching until a delayed extent is found.
When there are a lots of non-delayed entries in the extent state
tree, ext4_es_find_delayed_extent() may uses a lot of CPU time.

Reported-by: LKP project <lkp@linux.intel.com>
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
2013-05-03 02:15:52 -04:00
..
9p
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
adfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
affs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
afs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
autofs4
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
befs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
bfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
btrfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
2013-03-29 11:13:25 -07:00
cachefiles
FS-Cache: Mark cancellation of in-progress operation
2012-12-20 22:34:00 +00:00
ceph
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
cifs
Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
2013-03-21 17:59:22 -07:00
coda
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
configfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
cramfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
debugfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
devpts
fs: Limit sys_mount to only request filesystem modules (Part 2).
2013-03-07 01:08:55 -08:00
dlm
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
ecryptfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-03-09 16:51:13 -08:00
efs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
exofs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
exportfs
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
ext2
ext2: Fix BUG_ON in evict() on inode deletion
2013-03-13 15:23:44 +01:00
ext3
ext3: Fix format string issues
2013-03-11 22:05:56 +01:00
ext4
ext4: fix fio regression
2013-05-03 02:15:52 -04:00
f2fs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
fat
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
freevxfs
fs: Readd the fs module aliases.
2013-03-12 18:55:21 -07:00
fscache
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
fuse
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
gfs2
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
hfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
hfsplus
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
hostfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-03-13 15:47:50 -07:00
hpfs
fs: Limit sys_mount to only request filesystem modules. (Part 3)
2013-03-11 07:09:48 -07:00
hppfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
hugetlbfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
isofs
fs: Readd the fs module aliases.
2013-03-12 18:55:21 -07:00
jbd
jbd: don't wake kjournald unnecessarily
2013-01-14 22:50:45 +01:00
jbd2
jbd2: trace when lock_buffer in do_get_write_access takes a long time
2013-04-21 16:47:54 -04:00
jffs2
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
jfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
lockd
Merge branch 'for-3.9' of git://linux-nfs.org/~bfields/linux
2013-02-28 18:02:55 -08:00
logfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
minix
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
ncpfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
nfs
Merge tag 'nfs-for-3.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2013-03-26 14:23:45 -07:00
nfs_common
nfs_common: Update the translation between nfsv3 acls linux posix acls
2013-02-13 06:15:14 -08:00
nfsd
nfsd: fix bad offset use
2013-03-22 16:55:15 -04:00
nilfs2
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
nls
…
notify
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
ntfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
ocfs2
fs: Limit sys_mount to only request filesystem modules (Part 2).
2013-03-07 01:08:55 -08:00
omfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
openpromfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
proc
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-03-28 13:43:46 -07:00
pstore
Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux
2013-02-21 09:38:18 -08:00
qnx4
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
qnx6
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
quota
quota: add missing use of dq_data_lock in __dquot_initialize
2013-03-11 22:05:56 +01:00
ramfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
reiserfs
reiserfs: Use kstrdup instead of kmalloc/strcpy
2013-03-11 22:05:57 +01:00
romfs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
squashfs
fs: Limit sys_mount to only request filesystem modules. (Part 3)
2013-03-11 07:09:48 -07:00
sysfs
Merge tag 'driver-core-3.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
2013-03-28 15:52:14 -07:00
sysv
fs: Readd the fs module aliases.
2013-03-12 18:55:21 -07:00
ubifs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
udf
fs: Limit sys_mount to only request filesystem modules. (Part 3)
2013-03-11 07:09:48 -07:00
ufs
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
xfs
Merge tag 'for-linus-v3.9-rc4' of git://oss.sgi.com/xfs/xfs
2013-03-19 15:17:40 -07:00
aio.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
anon_inodes.c
get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero
2013-02-26 02:46:11 -05:00
attr.c
userns: Allow chown and setgid preservation
2012-11-20 04:17:24 -08:00
bad_inode.c
lseek: the "whence" argument is called "whence"
2012-12-17 17:15:12 -08:00
binfmt_aout.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
binfmt_elf_fdpic.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
binfmt_elf.c
Merge tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag
2013-03-03 12:06:09 -08:00
binfmt_em86.c
exec: use -ELOOP for max recursion depth
2012-12-17 17:15:23 -08:00
binfmt_flat.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
binfmt_misc.c
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
binfmt_script.c
exec: do not leave bprm->interp on stack
2012-12-20 17:40:19 -08:00
binfmt_som.c
get rid of pt_regs argument of ->load_binary()
2012-11-28 21:53:38 -05:00
bio-integrity.c
…
bio.c
block: add missing block_bio_complete() tracepoint
2013-01-14 15:00:36 +01:00
block_dev.c
Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block
2013-02-28 12:52:24 -08:00
buffer.c
buffer: add BH_Prio and BH_Meta flags
2013-04-20 19:58:37 -04:00
char_dev.c
char_dev: pin parent kobject
2012-10-22 08:50:37 +03:00
compat_binfmt_elf.c
coredump: extend core dump note section to contain file names of mapped files
2012-10-06 03:05:17 +09:00
compat_ioctl.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
compat.c
Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys
2013-03-12 11:05:45 -07:00
coredump.c
coredump: remove redundant defines for dumpable states
2013-02-27 19:10:11 -08:00
coredump.h
coredump: update coredump-related headers
2012-10-06 03:05:15 +09:00
dcache.c
Nest rename_lock inside vfsmount_lock
2013-03-26 18:25:57 -04:00
dcookies.c
…
direct-io.c
fs: Fix possible use-after-free with AIO
2013-02-22 23:31:36 -05:00
drop_caches.c
…
eventfd.c
fs, eventfd: add procfs fdinfo helper
2012-12-17 17:15:27 -08:00
eventpoll.c
epoll: prevent missed events on EPOLL_CTL_MOD
2013-01-02 09:16:43 -08:00
exec.c
coredump: remove redundant defines for dumpable states
2013-02-27 19:10:11 -08:00
fcntl.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
fhandle.c
Merge branch 'for-3.8' of git://linux-nfs.org/~bfields/linux
2012-12-20 14:04:11 -08:00
fifo.c
…
file_table.c
cache the value of file_inode() in struct file
2013-03-01 19:48:30 -05:00
file.c
locking: Various static lock initializer fixes
2013-02-19 08:42:45 +01:00
filesystems.c
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
fs_struct.c
constify path_get/path_put and fs_struct.c stuff
2013-03-01 23:51:07 -05:00
fs-writeback.c
Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
2013-02-28 13:21:44 -08:00
generic_acl.c
…
inode.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
internal.h
Don't bother with redoing rw_verify_area() from default_file_splice_from()
2013-03-21 13:11:11 -04:00
ioctl.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
ioprio.c
…
Kconfig
fuse: Move CUSE Kconfig entry from fs/Kconfig into fs/fuse/Kconfig
2013-01-17 13:08:45 +01:00
Kconfig.binfmt
coredump: make core dump functionality optional
2012-10-06 03:05:15 +09:00
libfs.c
vfs: drop vmtruncate
2012-12-20 18:46:29 -05:00
locks.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
Makefile
f2fs: update Kconfig and Makefile
2012-12-11 13:43:42 +09:00
mbcache.c
…
mount.h
proc: Usable inode numbers for the namespace file descriptors.
2012-11-20 04:19:49 -08:00
mpage.c
…
namei.c
vfs: don't BUG_ON() if following a /proc fd pseudo-symlink results in a symlink
2013-03-08 09:03:07 -08:00
namespace.c
userns: Restrict when proc and sysfs can be mounted
2013-03-27 07:50:08 -07:00
no-block.c
…
open.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-03-03 13:23:03 -08:00
pipe.c
vfs: fix pipe counter breakage
2013-03-12 08:29:17 -07:00
pnode.c
vfs: Carefully propogate mounts across user namespaces
2013-03-27 07:50:05 -07:00
pnode.h
vfs: Carefully propogate mounts across user namespaces
2013-03-27 07:50:05 -07:00
posix_acl.c
…
proc_namespace.c
…
read_write.c
vfs/splice: Fix missed checks in new __kernel_write() helper
2013-03-27 09:24:02 -07:00
read_write.h
compat: fs: Generic compat_sys_sendfile implementation
2012-10-02 21:35:55 -04:00
readdir.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
select.c
sched/rt: Move rt specific bits into new header file
2013-02-07 20:51:08 +01:00
seq_file.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-03-03 13:23:03 -08:00
signalfd.c
fs, epoll: add procfs fdinfo helper
2012-12-17 17:15:27 -08:00
splice.c
Don't bother with redoing rw_verify_area() from default_file_splice_from()
2013-03-21 13:11:11 -04:00
stack.c
…
stat.c
switch vfs_getattr() to struct path
2013-02-26 02:46:08 -05:00
statfs.c
vfs: fix user_statfs to retry once on ESTALE errors
2012-12-20 18:50:07 -05:00
super.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
sync.c
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
timerfd.c
compat: restore timerfd settime and gettime compat syscalls
2013-03-02 09:35:13 -05:00
utimes.c
vfs: allow utimensat() calls to retry once on an ESTALE error
2012-12-20 18:50:08 -05:00
xattr_acl.c
userns: Fix posix_acl_file_xattr_userns gid conversion
2012-10-12 13:16:48 -07:00
xattr.c
vfs: make lremovexattr retry once on ESTALE error
2012-12-20 18:50:11 -05:00