Commit 9502a7f6 authored by Alexander Aring's avatar Alexander Aring Committed by David Teigland
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dlm: use kref_put_lock in put_rsb 



This patch will optimize put_rsb() by using kref_put_lock(). The
function kref_put_lock() will only take the lock if the reference is
going to be zero, if not the lock will never be held.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
parent 0ccc1060

fs/dlm/lock.c

+5 −3
Original line number Diff line number Diff line
@@ -350,9 +350,11 @@ static void put_rsb(struct dlm_rsb *r) 
{

	struct dlm_ls *ls = r->res_ls;

	uint32_t bucket = r->res_bucket;

	int rv;



	spin_lock(&ls->ls_rsbtbl[bucket].lock);

	kref_put(&r->res_ref, toss_rsb);

	rv = kref_put_lock(&r->res_ref, toss_rsb,

			   &ls->ls_rsbtbl[bucket].lock);

	if (rv)

		spin_unlock(&ls->ls_rsbtbl[bucket].lock);

}