linux/fs/nfs
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
..
Kconfig NFS: Permit local filesystem caching to be enabled for NFS 2009-04-03 16:42:42 +01:00
Makefile NFS: Define and create server-level objects 2009-04-03 16:42:42 +01:00
callback.c
callback.h
callback_proc.c
callback_xdr.c
client.c NFS: Add mount options to enable local caching on NFS 2009-04-03 16:42:48 +01:00
delegation.c
delegation.h
dir.c nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission. 2009-05-18 20:11:12 -07:00
direct.c
file.c NFS: Close page_mkwrite() races 2009-05-02 19:42:39 -07:00
fscache-index.c NFS: Add read context retention for FS-Cache to call back with 2009-04-03 16:42:44 +01:00
fscache.c NFS: Store pages from an NFS inode into a local cache 2009-04-03 16:42:45 +01:00
fscache.h NFS: Display local caching state 2009-04-03 16:42:47 +01:00
getroot.c
idmap.c
inode.c NFS: Use local disk inode cache 2009-04-03 16:42:43 +01:00
internal.h NFS: Add mount options to enable local caching on NFS 2009-04-03 16:42:48 +01:00
iostat.h remove put_cpu_no_resched() 2009-06-16 19:47:48 -07:00
mount_clnt.c
namespace.c switch follow_down() 2009-06-11 21:36:01 -04:00
nfs2xdr.c
nfs3acl.c
nfs3proc.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
nfs3xdr.c NFS: Fix the XDR iovec calculation in nfs3_xdr_setaclargs 2009-04-21 07:46:49 -07:00
nfs4_fs.h
nfs4namespace.c
nfs4proc.c NFSv4: Fix the case where NFSv4 renewal fails 2009-05-26 14:51:00 -04:00
nfs4renewd.c
nfs4state.c
nfs4xdr.c
nfsroot.c nfs: fix build error in nfsroot with initconst 2009-05-26 14:51:00 -04:00
pagelist.c
proc.c
read.c NFS: Store pages from an NFS inode into a local cache 2009-04-03 16:42:45 +01:00
super.c Push BKL down into ->remount_fs() 2009-06-11 21:36:11 -04:00
symlink.c
sysctl.c
unlink.c
write.c