Nick Piggin fa0d7e3de6 fs: icache RCU free inodes ... RCU free the struct inode. This will allow: - Subsequent store-free path walking patch. The inode must be consulted for permissions when walking, so an RCU inode reference is a must. - sb_inode_list_lock to be moved inside i_lock because sb list walkers who want to take i_lock no longer need to take sb_inode_list_lock to walk the list in the first place. This will simplify and optimize locking. - Could remove some nested trylock loops in dcache code - Could potentially simplify things a bit in VM land. Do not need to take the page lock to follow page->mapping. The downsides of this is the performance cost of using RCU. In a simple creat/unlink microbenchmark, performance drops by about 10% due to inability to reuse cache-hot slab objects. As iterations increase and RCU freeing starts kicking over, this increases to about 20%. In cases where inode lifetimes are longer (ie. many inodes may be allocated during the average life span of a single inode), a lot of this cache reuse is not applicable, so the regression caused by this patch is smaller. The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU, however this adds some complexity to list walking and store-free path walking, so I prefer to implement this at a later date, if it is shown to be a win in real situations. I haven't found a regression in any non-micro benchmark so I doubt it will be a problem. Signed-off-by: Nick Piggin <npiggin@kernel.dk>		2011-01-07 17:50:26 +11:00
..
caching	fscache: convert object to use workqueue instead of slow-work	2010-07-22 22:58:34 +02:00
configfs	Documentation: make configfs example code simpler, clearer	2010-11-18 15:00:46 -08:00
nfs	NFS: rename nfs.upcall -> nfs.idmap	2010-10-26 13:57:10 -04:00
pohmelfs	Staging: Pohmelfs: Added IO permissions and priorities.	2009-04-17 11:06:30 -07:00
00-INDEX	smbfs: move to drivers/staging	2010-10-05 09:08:21 -07:00
9p.txt	fs/9p: Add access = client option to opt in acl evaluation.	2010-10-28 09:08:46 -05:00
adfs.txt	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
affs.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
afs.txt	AFS: Documentation updates	2009-08-19 10:40:13 -07:00
autofs4-mount-control.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
automount-support.txt	VFS: Unexport do_kern_mount() and clean up simple_pin_fs()	2006-06-09 09:34:16 -04:00
befs.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
bfs.txt	remove mention of CONFIG_KMOD from documentation	2008-07-22 19:24:29 +10:00
btrfs.txt	Btrfs: Add Documentation/filesystem/btrfs.txt, remove old COPYING	2009-01-07 09:54:24 -05:00
ceph.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
cifs.txt
coda.txt
cramfs.txt
debugfs.txt	Document the debugfs API	2009-06-06 10:28:14 -06:00
dentry-locking.txt	fs: dcache remove dcache_lock	2011-01-07 17:50:23 +11:00
devpts.txt	Document usage of multiple-instances of devpts	2009-01-02 10:19:36 -08:00
directory-locking	Documentation: Fix up docs still talking about i_sem	2007-05-24 10:16:17 -07:00
dlmfs.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
dnotify.txt	Documentation/fs/: split txt and source files	2010-03-12 15:52:35 -08:00
dnotify_test.c	Documentation/fs/: split txt and source files	2010-03-12 15:52:35 -08:00
ecryptfs.txt	eCryptfs: Move ecryptfs docs into Documentation/filesystems/	2007-07-17 10:23:08 -07:00
exofs.txt	trivial: some small fixes in exofs documentation	2009-12-10 09:59:16 +02:00
ext2.txt	Doc fix: ext2 can only have 32,000 subdirs, not 32,768	2009-06-18 13:03:44 -07:00
ext3.txt	ext3: make barrier options consistent with ext4	2010-05-21 19:30:41 +02:00
ext4.txt	ext4: add support for lazy inode table initialization	2010-10-27 21:30:05 -04:00
fiemap.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
files.txt	fix f_count description in Documentation/filesystems/files.txt	2008-12-31 18:07:42 -05:00
fuse.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
gfs2-glocks.txt	GFS2: Update docs	2009-05-19 10:23:23 +01:00
gfs2-uevents.txt	GFS2: Add a document explaining GFS2's uevents	2009-08-17 11:11:41 +01:00
gfs2.txt	GFS2: docs update	2010-03-29 14:28:52 +01:00
hfs.txt
hfsplus.txt	Documentation: document HFSPlus	2007-07-31 15:39:38 -07:00
hpfs.txt	Documentation/: it's -> its where appropriate	2010-04-23 02:09:52 +02:00
inotify.txt	[PATCH] inotify (5/5): update kernel documentation	2006-06-20 05:25:19 -04:00
isofs.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
jfs.txt	JFS: document uid, gid, and umask mount options in jfs.txt	2007-03-09 10:27:31 -06:00
Locking	fs: dcache remove dcache_lock	2011-01-07 17:50:23 +11:00
locks.txt	Documentation: move locks.txt in filesystems/	2007-10-09 18:32:45 -04:00
logfs.txt	fix "seperate" typos in comments	2010-05-10 11:56:30 +02:00
Makefile	Documentation/fs/: split txt and source files	2010-03-12 15:52:35 -08:00
mandatory-locking.txt	locks: add warning about mandatory locking races	2007-10-09 18:32:45 -04:00
ncpfs.txt	ncpfs: remove dead URL from documentation	2009-09-23 07:39:42 -07:00
nilfs2.txt	nilfs2: add nodiscard mount option	2010-07-23 10:02:12 +09:00
ntfs.txt	NTFS: update homepage	2008-09-02 19:21:37 -07:00
ocfs2.txt	ocfs2: Add a mount option "coherency=*" to handle cluster coherency for O_DIRECT writes.	2010-10-11 14:14:55 -07:00
omfs.txt	omfs: add filesystem documentation	2008-07-26 12:00:05 -07:00
porting	fs: icache RCU free inodes	2011-01-07 17:50:26 +11:00
proc.txt	/proc/pid/pagemap: document in Documentation/filesystems/proc.txt	2010-10-27 18:03:13 -07:00
quota.txt	quota: documentation for sending "below quota" messages via netlink and tiny doc update	2008-08-12 16:07:27 -07:00
ramfs-rootfs-initramfs.txt	Trivial Documentation/filesystems/ramfs-rootfs-initramfs.txt fix	2008-11-30 11:40:56 -08:00
relay.txt	relay: add buffer-only channels; useful for early logging	2008-07-26 12:00:04 -07:00
romfs.txt
seq_file.txt	seq_file: use proc_create() in documentation	2009-12-16 07:20:07 -08:00
sharedsubtree.txt	Documentation: Fix trivial typo in filesystems/sharedsubtree.txt	2010-10-25 21:18:21 -04:00
spufs.txt	Fix typos in /Documentation : 'U-Z'	2006-11-30 04:58:40 +01:00
squashfs.txt	Squashfs: update Kconfig and documentation for LZO	2010-08-05 23:42:54 +01:00
sysfs-pci.txt	PCI: Allow read/write access to sysfs I/O port resources	2010-07-30 09:32:08 -07:00
sysfs-tagging.txt	sysfs-namespaces: add a high-level Documentation file	2010-05-21 09:37:31 -07:00
sysfs.txt	sysfs: Fix one more signature discrepancy between sysfs implementation and docs.	2010-08-05 13:53:34 -07:00
sysv-fs.txt	[PATCH] fs/sysv/: doc cleanup	2006-12-07 08:39:44 -08:00
tmpfs.txt	mempolicy: document cpuset interaction with tmpfs mpol mount option	2010-05-25 08:06:57 -07:00
ubifs.txt	UBIFS: remove fast unmounting	2009-01-29 16:34:30 +02:00
udf.txt	udf: implement mode and dmode mounting options	2009-04-02 12:29:50 +02:00
ufs.txt	[PATCH] ufs2 write: mount as rw	2007-02-12 09:48:40 -08:00
vfat.txt	Documentation: update broken web addresses.	2010-08-04 15:21:40 +02:00
vfs.txt	fs: change d_hash for rcu-walk	2011-01-07 17:50:20 +11:00
xfs-delayed-logging-design.txt	xfs: remove experimental tag from the delaylog option	2010-11-10 12:00:47 -06:00
xfs.txt	xfs: remove obsolete osyncisosync mount option	2010-07-26 13:16:51 -05:00
xip.txt	DOC: update xip method info	2008-11-12 17:17:17 -08:00