The patch titled
add lookup hint for network file systems
has been added to the -mm tree. Its filename is
add-lookup-hint-for-network-file-systems.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: add lookup hint for network file systems
From: ASANO Masahiro <masano@xxxxxxxxxxxxxx>
I'm trying to speeding up mkdir(2) for network file systems. A typical
mkdir(2) calls two inode_operations: lookup and mkdir. The lookup
operation would fail with ENOENT in common case. I think it is unnecessary
because the subsequent mkdir operation can check it. In case of creat(2),
lookup operation is called with the LOOKUP_CREATE flag, so individual
filesystem can omit real lookup. e.g. nfs_lookup().
Here is a sample patch which uses LOOKUP_CREATE and O_EXCL on mkdir,
symlink and mknod. This uses the gadget for creat(2).
And here is the result of a benchmark on NFSv3.
mkdir(2) 10,000 times:
original 50.5 sec
patched 29.0 sec
Signed-off-by: ASANO Masahiro <masano@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/namei.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/namei.c~add-lookup-hint-for-network-file-systems fs/namei.c
--- a/fs/namei.c~add-lookup-hint-for-network-file-systems
+++ a/fs/namei.c
@@ -1779,6 +1779,8 @@ struct dentry *lookup_create(struct name
if (nd->last_type != LAST_NORM)
goto fail;
nd->flags &= ~LOOKUP_PARENT;
+ nd->flags |= LOOKUP_CREATE;
+ nd->intent.open.flags = O_EXCL;
/*
* Do the final lookup.
_
Patches currently in -mm which might be from masano@xxxxxxxxxxxxxx are
add-lookup-hint-for-network-file-systems.patch
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