Eric Dumazet d18de5a272 [PATCH] don't insert pipe dentries into dentry_hashtable. ... We currently insert pipe dentries into the global dentry hashtable. This is suboptimal because there is currently no way these entries can be used for a lookup(). (/proc/xxx/fd/xxx uses a different mechanism). Inserting them in dentry hashtable slows dcache lookups. To let __dpath() still work correctly (ie not adding a " (deleted)") after dentry name, we do : - Right after d_alloc(), pretend they are hashed by clearing the DCACHE_UNHASHED bit. - Call d_instantiate() instead of d_add() : dentry is not inserted in hash table. __dpath() & friends work as intended during dentry lifetime. - At dismantle time, once dput() must clear the dentry, setting again DCACHE_UNHASHED bit inside the custom d_delete() function provided by pipe code, so that dput() can just kill_it. This patch, combined with (avoid RCU for never hashed dentries) reduced time of { pipe(p); close(p[0]); close(p[1]);} on my UP machine (1.6GHz Pentium-M) from 3.23 us to 2.86 us (But this patch does not depend on other patches, only bench results) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-12-07 08:39:41 -08:00
..
9p	[PATCH] Function v9fs_get_idpool returns int, not u32 as called twice in fs/9p/vfs_inode.c	2006-12-07 08:39:33 -08:00
adfs	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
affs	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
afs	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
autofs	[PATCH] autofs4: panic after mount fail	2006-11-14 09:09:27 -08:00
autofs4	[PATCH] autofs4: panic after mount fail	2006-11-14 09:09:27 -08:00
befs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
bfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
cifs	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
coda	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
configfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
cramfs	[PATCH] corrupted cramfs filesystems cause kernel oops	2006-12-07 08:39:36 -08:00
debugfs	[PATCH] debugfs: add header file	2006-11-25 13:28:33 -08:00
devpts
dlm	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
ecryptfs	[PATCH] make ecryptfs_version_str_map[] static	2006-12-07 08:39:39 -08:00
efs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
exportfs	[PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers	2006-10-03 08:03:40 -07:00
ext2	[PATCH] protect ext2 ioctl modifying append_only immutable etc with i_mutex	2006-12-07 08:39:37 -08:00
ext3	[PATCH] ext3: fix reservation extension	2006-12-07 08:39:39 -08:00
ext4	[PATCH] ext4: fix reservation extension	2006-12-07 08:39:39 -08:00
fat	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
freevxfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
fuse	[PATCH] fuse: fix compile without CONFIG_BLOCK	2006-12-07 08:39:32 -08:00
gfs2	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
hfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
hfsplus	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
hostfs	[PATCH] Streamline generic_file_* interfaces and filemap cleanups	2006-10-01 00:39:28 -07:00
hpfs	[PATCH] hpfs: fix printk format warnings	2006-12-07 08:39:35 -08:00
hppfs	[PATCH] hppfs: readdir callback missed in prototype change	2006-10-09 14:19:08 -07:00
hugetlbfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
isofs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
jbd	[PATCH] make fs/jbd/transaction.c:__journal_temp_unlink_buffer() static	2006-12-07 08:39:40 -08:00
jbd2	[PATCH] make fs/jbd2/transaction.c:__kbd2_journal_temp_unlink_buffer() static	2006-12-07 08:39:40 -08:00
jffs	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
jffs2	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
jfs	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
lockd	[PATCH] fs/lockd/host.c: make 2 functions static	2006-12-07 08:39:40 -08:00
minix	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
msdos	[PATCH] fat: add fat_getattr()	2006-11-16 11:43:38 -08:00
ncpfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
nfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
nfs_common	[PATCH] nfs_common endianness annotations	2006-10-20 10:26:41 -07:00
nfsd	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
nls	fix file specification in comments	2006-10-03 23:01:26 +02:00
ntfs	[PATCH] slab: remove SLAB_NOFS	2006-12-07 08:39:23 -08:00
ocfs2	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
openpromfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
partitions	[PATCH] Fix check_partition routines	2006-12-07 08:39:30 -08:00
proc	[PATCH] make fs/proc/base.c:proc_pid_instantiate() static	2006-12-07 08:39:40 -08:00
qnx4	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
ramfs	[PATCH] r/o bind mount prepwork: inc_nlink() helper	2006-10-01 00:39:30 -07:00
reiserfs	[PATCH] reiserfs: add missing D-cache flushing	2006-12-07 08:39:38 -08:00
romfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
smbfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
sysfs	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
sysv	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
udf	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
ufs	[PATCH] fs/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
vfat	[PATCH] fat: add fat_getattr()	2006-11-16 11:43:38 -08:00
xfs	[PATCH] Use freezeable workqueues in XFS	2006-12-07 08:39:29 -08:00
aio.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
attr.c
bad_inode.c	[PATCH] Remove readv/writev methods and use aio_read/aio_write instead	2006-10-01 00:39:28 -07:00
binfmt_aout.c
binfmt_elf.c	[PATCH] elf: Always define elf_addr_t in linux/elf.h	2006-12-07 08:39:38 -08:00
binfmt_elf_fdpic.c	[PATCH] elf: Always define elf_addr_t in linux/elf.h	2006-12-07 08:39:38 -08:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c	[PARISC] Fix fs/binfmt_som.c	2006-10-04 06:51:26 -06:00
bio.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
block_dev.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
buffer.c	[PATCH] hotplug CPU: clean up hotcpu_notifier() use	2006-12-07 08:39:39 -08:00
char_dev.c	[PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6]	2006-09-30 20:52:18 +02:00
compat.c	[PATCH] compat: fix uaccess handling	2006-12-07 08:39:33 -08:00
compat_ioctl.c	[PATCH] compat: fix uaccess handling	2006-12-07 08:39:33 -08:00
dcache.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
dcookies.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
direct-io.c
dnotify.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
dquot.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
drop_caches.c
eventpoll.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
exec.c	[PATCH] slab: remove SLAB_KERNEL	2006-12-07 08:39:24 -08:00
fcntl.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
fifo.c
file.c	[PATCH] file: kill unnecessary timer in fdtable_defer	2006-12-07 08:39:32 -08:00
file_table.c	[PATCH] file: modify struct fown_struct to use a struct pid	2006-10-02 07:57:14 -07:00
filesystems.c
fs-writeback.c	[PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #6]	2006-09-30 20:52:26 +02:00
generic_acl.c
inode.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
inotify.c	[PATCH] severing fs.h, radix-tree.h -> sched.h	2006-12-04 02:00:24 -05:00
inotify_user.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
internal.h	[PATCH] CONFIG_BLOCK internal.h cleanups	2006-09-30 20:52:32 +02:00
ioctl.c
ioprio.c	[PATCH] block layer: ioprio_best function fix	2006-10-12 15:09:51 +02:00
Kconfig	Fix typos in doc and comments	2006-11-30 05:32:19 +01:00
Kconfig.binfmt
libfs.c	[PATCH] r/o bind mount prepwork: inc_nlink() helper	2006-10-01 00:39:30 -07:00
locks.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
Makefile	[PATCH] jbd2: enable building of jbd2 and have ext4 use it rather than jbd	2006-10-11 11:14:16 -07:00
mbcache.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
mpage.c	[PATCH] BLOCK: Dissociate generic_writepages() from mpage stuff [try #6]	2006-09-30 20:52:26 +02:00
namei.c	[PATCH] VFS: extra check inside dentry_unhash()	2006-12-07 08:39:35 -08:00
namespace.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
nfsctl.c
no-block.c	[PATCH] BLOCK: Make it possible to disable the block layer [try #6]	2006-09-30 20:52:31 +02:00
open.c	[PATCH] r/o bind mounts: prepare for write access checks: collapse if()	2006-10-01 00:39:30 -07:00
pipe.c	[PATCH] don't insert pipe dentries into dentry_hashtable.	2006-12-07 08:39:41 -08:00
pnode.c
pnode.h
posix_acl.c	[PATCH] kmemdup: some users	2006-10-01 00:39:19 -07:00
quota.c	[PATCH] BLOCK: Make it possible to disable the block layer [try #6]	2006-09-30 20:52:31 +02:00
quota_v1.c
quota_v2.c
read_write.c	[PATCH] Add vector AIO support	2006-10-01 00:39:29 -07:00
read_write.h	[PATCH] Remove readv/writev methods and use aio_read/aio_write instead	2006-10-01 00:39:28 -07:00
readdir.c	[PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers	2006-10-03 08:03:40 -07:00
select.c
seq_file.c
splice.c	[PATCH] splice: fix problem introduced with inode diet	2006-11-04 08:45:39 -08:00
stat.c	[PATCH] vfs_getattr(): remove dead code	2006-12-07 08:39:35 -08:00
super.c	[PATCH] severing fs.h, radix-tree.h -> sched.h	2006-12-04 02:00:24 -05:00
sync.c	[PATCH] severing fs.h, radix-tree.h -> sched.h	2006-12-04 02:00:24 -05:00
utimes.c	[PATCH] severing fs.h, radix-tree.h -> sched.h	2006-12-04 02:00:24 -05:00
xattr.c	[PATCH] Fix user.* xattr permission check for sticky dirs	2006-11-03 12:27:59 -08:00
xattr_acl.c