On Fri, 23 Jun 2006 21:04:30 +0900 (JST) ASANO Masahiro <masano@xxxxxxxxxxxxxx> wrote: > Hi, > > 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> > > --- > > fs/namei.c | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > 5273ee304b4dc1096432dc3f3aa9183e20afab1d > diff --git a/fs/namei.c b/fs/namei.c > index 184fe4a..209867d 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -1759,6 +1759,8 @@ 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. whoa. Big patch ;) I'll save it up for when Trond returns, thanks. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
