dcache-percpu-nr_dentry

The nr_dentry stat is a globally touched cacheline and atomic operation
twice over the lifetime of a dentry. It is used for the benfit of userspace
only. We could make a per-cpu counter or something for it, but it is only
accessed via proc, so we could use slab stats.

XXX: must implement slab routines to return stats for a single cache, and
implement the proc handler.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 1ca2e7fb7a86..efdeb3582a17 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -37,7 +37,7 @@ struct qstr {
 };
 
 struct dentry_stat_t {
-        atomic_t nr_dentry;
+        int nr_dentry;          /* unused */
         int nr_unused;          /* protected by dcache_lru_lock */
         int age_limit;          /* age in seconds */
         int want_pages;         /* pages requested by system */