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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	…
Makefile	…
cache_lib.c	…
cache_lib.h	…
callback.c	…
callback.h	…
callback_proc.c	…
callback_xdr.c	…
client.c	…
delegation.c	…
delegation.h	…
dir.c	fs: dcache remove dcache_lock	14 years ago
direct.c	…
dns_resolve.c	…
dns_resolve.h	…
file.c	NFS: Fix fcntl F_GETLK not reporting some conflicts	14 years ago
fscache-index.c	…
fscache.c	…
fscache.h	…
getroot.c	fs: dcache remove dcache_lock	14 years ago
idmap.c	…
inode.c	fs: icache RCU free inodes	14 years ago
internal.h	NFS: Ensure we return the dirent->d_type when it is known	14 years ago
iostat.h	…
mount_clnt.c	NFS: Fix panic after nfs_umount()	14 years ago
namespace.c	fs: dcache remove dcache_lock	14 years ago
nfs2xdr.c	NFS: Ensure we return the dirent->d_type when it is known	14 years ago
nfs3acl.c	…
nfs3proc.c	…
nfs3xdr.c	NFS: Ensure we return the dirent->d_type when it is known	14 years ago
nfs4_fs.h	…
nfs4filelayout.c	…
nfs4filelayout.h	…
nfs4filelayoutdev.c	…
nfs4namespace.c	…
nfs4proc.c	nfs: Discard ACL cache on mode update	14 years ago
nfs4renewd.c	…
nfs4state.c	…
nfs4xdr.c	NFS: Ensure we return the dirent->d_type when it is known	14 years ago
nfsroot.c	…
pagelist.c	nfs: remove extraneous and problematic calls to nfs_clear_request	14 years ago
pnfs.c	…
pnfs.h	…
proc.c	…
read.c	nfs: remove extraneous and problematic calls to nfs_clear_request	14 years ago
super.c	nfs: kernel should return EPROTONOSUPPORT when not support NFSv4	14 years ago
symlink.c	…
sysctl.c	…
unlink.c	fs: dcache scale dentry refcount	14 years ago
write.c	nfs: remove extraneous and problematic calls to nfs_clear_request	14 years ago