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Thomas Gleixner 8b0b1db013 remove put_cpu_no_resched() 
put_cpu_no_resched() is an optimization of put_cpu() which unfortunately
can cause high latencies.

The nfs iostats code uses put_cpu_no_resched() in a code sequence where a
reschedule request caused by an interrupt between the get_cpu() and the
put_cpu_no_resched() can delay the reschedule for at least HZ.

The other users of put_cpu_no_resched() optimize correctly in interrupt
code, but there is no real harm in using the put_cpu() function which is
an alias for preempt_enable().  The extra check of the preemmpt count is
not as critical as the potential source of missing a reschedule.

Debugged in the preempt-rt tree and verified in mainline.

Impact: remove a high latency source

[akpm@linux-foundation.org: build fix]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-06-16 19:47:48 -07:00
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9p
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adfs Fix adfs GET_FRAG_ID() on big-endian 2009-06-11 21:36:14 -04:00
affs affs: add ->sync_fs 2009-06-11 21:36:14 -04:00
afs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
autofs switch follow_down() 2009-06-11 21:36:01 -04:00
autofs4 switch follow_down() 2009-06-11 21:36:01 -04:00
befs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
bfs bfs: add ->sync_fs 2009-06-11 21:36:14 -04:00
btrfs enforce ->sync_fs is only called for rw superblock 2009-06-11 21:36:06 -04:00
cachefiles enforce ->sync_fs is only called for rw superblock 2009-06-11 21:36:06 -04:00
cifs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
coda
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configfs
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cramfs
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debugfs
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devpts devpts: unregister the file system on error 2009-06-11 08:51:06 -07:00
dlm
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ecryptfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
efs
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exofs [SCSI] Merge branch 'linus' 2009-06-12 10:02:03 -05:00
exportfs
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ext2 trivial: ext2: fix a typo in comment in ext2.h 2009-06-12 18:01:44 +02:00
ext3 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
ext4 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
fat fat: add ->sync_fs 2009-06-11 21:36:15 -04:00
freevxfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
fscache
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fuse Merge branch 'cuse' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2009-06-12 09:31:20 -07:00
gfs2 GFS2: Remove lock_kernel from gfs2_put_super() 2009-06-12 13:40:47 +01:00
hfs hfs: add ->sync_fs 2009-06-11 21:36:15 -04:00
hfsplus hfsplus: add ->sync_fs 2009-06-11 21:36:16 -04:00
hostfs
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hpfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
hppfs
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hugetlbfs
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isofs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
jbd
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jbd2
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jffs2 jffs2: call jffs2_write_super from jffs2_sync_fs 2009-06-11 21:36:16 -04:00
jfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
lockd
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minix switch minix to simple_fsync() 2009-06-11 21:36:12 -04:00
ncpfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
nfs remove put_cpu_no_resched() 2009-06-16 19:47:48 -07:00
nfs_common
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nfsd switch follow_down() 2009-06-11 21:36:01 -04:00
nilfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2 2009-06-15 09:13:49 -07:00
nls
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notify fsnotify: allow groups to set freeing_mark to null 2009-06-11 14:57:55 -04:00
ntfs ntfs: use is_power_of_2() function for clarity. 2009-06-16 19:47:48 -07:00
ocfs2 Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
omfs switch omfs to simple_fsync() 2009-06-11 21:36:13 -04:00
openpromfs
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partitions Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2009-06-12 09:29:42 -07:00
proc oom: move oom_adj value from task_struct to mm_struct 2009-06-16 19:47:43 -07:00
qnx4 fs/qnx4: sanitize includes 2009-06-11 21:36:12 -04:00
quota quota: cleanup dquota sync functions (version 4) 2009-06-11 21:36:04 -04:00
ramfs ramfs: ignore unknown mount options 2009-06-14 17:58:25 -07:00
reiserfs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
romfs
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smbfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
squashfs push BKL down into ->put_super 2009-06-11 21:36:07 -04:00
sysfs
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sysv sysv: add ->sync_fs 2009-06-11 21:36:16 -04:00
ubifs Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
udf switch udf to simple_fsync() 2009-06-11 21:36:13 -04:00
ufs ufs: add ->sync_fs 2009-06-11 21:36:16 -04:00
xfs Merge branch 'master' of git://oss.sgi.com/xfs/xfs into for-linus 2009-06-12 21:28:59 -05:00
Kconfig
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Kconfig.binfmt
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Makefile
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aio.c
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anon_inodes.c
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attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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bio-integrity.c
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bio.c trivial: fix typo in bio_alloc kernel doc 2009-06-12 18:01:47 +02:00
block_dev.c vfs: Rename fsync_super() to sync_filesystem() (version 4) 2009-06-11 21:36:04 -04:00
buffer.c Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block 2009-06-11 11:10:35 -07:00
char_dev.c fs: Remove i_cindex from struct inode 2009-06-11 21:36:09 -04:00
compat.c trivial: fix comment typo in fs/compat.c 2009-06-12 18:01:44 +02:00
compat_binfmt_elf.c
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compat_ioctl.c trivial: fix typo compatiable/compatiability has extra 'a'. 2009-06-12 18:01:46 +02:00
dcache.c dcache: extrace and use d_unlinked() 2009-06-11 21:36:06 -04:00
dcookies.c
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direct-io.c
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drop_caches.c mm: remove __invalidate_mapping_pages variant 2009-06-16 19:47:43 -07:00
eventfd.c eventfd: export eventfd_signal and eventfd_fget for lguest 2009-06-12 22:27:09 +09:30
eventpoll.c
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exec.c Merge branch 'perfcounters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-11 14:01:07 -07:00
fcntl.c
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fifo.c
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file.c
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file_table.c fs: move mark_files_ro into file_table.c 2009-06-11 21:36:02 -04:00
filesystems.c
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fs-writeback.c writeback: skip new or to-be-freed inodes 2009-06-16 19:47:45 -07:00
fs_struct.c
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generic_acl.c
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inode.c trivial: fs/inode: Fix typo in file_update_time nanodoc 2009-06-12 18:01:45 +02:00
internal.h Trim a bit of crap from fs.h 2009-06-11 21:36:07 -04:00
ioctl.c
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ioprio.c
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libfs.c New helper - simple_fsync() 2009-06-11 21:36:11 -04:00
locks.c
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mbcache.c
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mpage.c
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namei.c switch lookup_mnt() 2009-06-11 21:36:01 -04:00
namespace.c Push BKL down into do_remount_sb() 2009-06-11 21:36:08 -04:00
nfsctl.c
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no-block.c
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open.c fs: introduce mnt_clone_write 2009-06-11 21:36:02 -04:00
pipe.c
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pnode.c
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pnode.h
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posix_acl.c
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read_write.c
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read_write.h
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readdir.c
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select.c poll: avoid extra wakeups in select/poll 2009-06-16 19:47:48 -07:00
seq_file.c
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signalfd.c
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splice.c
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stack.c
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stat.c
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super.c Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
sync.c remove the call to ->write_super in __sync_filesystem 2009-06-11 21:36:17 -04:00
timerfd.c
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utimes.c
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xattr.c fs: introduce mnt_clone_write 2009-06-11 21:36:02 -04:00
xattr_acl.c
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