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authorJohn McCutchan <ttb@tentacle.dhs.org>2005-09-06 15:16:38 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:57:19 -0700
commit820249bafe441dce5336ad544a5e709df42fceb5 (patch)
tree01d296cba9583c05a88ea19e68f40f3817829a39 /fs
parent19306059cd7fedaf96b4b0260a9a8a45e513c857 (diff)
downloadop-kernel-dev-820249bafe441dce5336ad544a5e709df42fceb5.zip
op-kernel-dev-820249bafe441dce5336ad544a5e709df42fceb5.tar.gz
[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>
Diffstat (limited to 'fs')
-rw-r--r--fs/inotify.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/inotify.c b/fs/inotify.c
index 2e4e2a5..2fd97ef 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),
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