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| author | John McCutchan <ttb@tentacle.dhs.org> | 2005-09-06 15:16:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:19 -0700 |
| commit | 820249bafe441dce5336ad544a5e709df42fceb5 (patch) | |
| tree | 01d296cba9583c05a88ea19e68f40f3817829a39 | |
| parent | 19306059cd7fedaf96b4b0260a9a8a45e513c857 (diff) | |
| download | blackbird-op-linux-820249bafe441dce5336ad544a5e709df42fceb5.tar.gz blackbird-op-linux-820249bafe441dce5336ad544a5e709df42fceb5.zip | |
[PATCH] inotify speedup
Bypass an inotify-related fastpath spinlock and several function calls on
systems which have no inotify watches registered.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/inotify.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/inotify.c b/fs/inotify.c index 2e4e2a57708c..2fd97ef547ff 100644 --- a/fs/inotify.c +++ b/fs/inotify.c @@ -37,6 +37,7 @@ #include <asm/ioctls.h> static atomic_t inotify_cookie; +static atomic_t inotify_watches; static kmem_cache_t *watch_cachep; static kmem_cache_t *event_cachep; @@ -422,6 +423,7 @@ static struct inotify_watch *create_watch(struct inotify_device *dev, get_inotify_watch(watch); atomic_inc(&dev->user->inotify_watches); + atomic_inc(&inotify_watches); return watch; } @@ -454,6 +456,7 @@ static void remove_watch_no_event(struct inotify_watch *watch, list_del(&watch->d_list); atomic_dec(&dev->user->inotify_watches); + atomic_dec(&inotify_watches); idr_remove(&dev->idr, watch->wd); put_inotify_watch(watch); } @@ -532,6 +535,9 @@ void inotify_dentry_parent_queue_event(struct dentry *dentry, u32 mask, struct dentry *parent; struct inode *inode; + if (!atomic_read (&inotify_watches)) + return; + spin_lock(&dentry->d_lock); parent = dentry->d_parent; inode = parent->d_inode; @@ -1043,6 +1049,7 @@ static int __init inotify_setup(void) inotify_max_user_watches = 8192; atomic_set(&inotify_cookie, 0); + atomic_set(&inotify_watches, 0); watch_cachep = kmem_cache_create("inotify_watch_cache", sizeof(struct inotify_watch), |
