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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>		14 years ago
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Kconfig	BKL: introduce CONFIG_BKL.	14 years ago
Makefile	…
balloc.c	remove SWRITE* I/O types	15 years ago
cylinder.c	drop linux/ufs_fs.h from userspace export and relocate it to fs/ufs/ufs_fs.h	17 years ago
dir.c	clean up write_begin usage for directories in pagecache	15 years ago
file.c	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6	15 years ago
ialloc.c	remove SWRITE* I/O types	15 years ago
inode.c	switch ufs to ->evict_inode()	15 years ago
namei.c	new helper: ihold()	14 years ago
super.c	fs: icache RCU free inodes	14 years ago
swab.h	ufs: replace __inline with inline	17 years ago
symlink.c	ufs: add ufs speciffic ->setattr call	15 years ago
truncate.c	remove SWRITE* I/O types	15 years ago
ufs.h	switch ufs to ->evict_inode()	15 years ago
ufs_fs.h	ufs: permit mounting of BorderWare filesystems	15 years ago
util.c	remove SWRITE* I/O types	15 years ago
util.h	remove SWRITE* I/O types	15 years ago