[Ocfs2-devel] [PATCH 19/26] ocfs2/dlm: Track number of mles

[Sunil Mushran]

Mainline commit 2041d8fdcec7603401829f60810c1dbd5e96c043

The lifetime of a mle is limited to the duration of the lockres mastery
process. While typically this lifetime is fairly short, we have noticed
the number of mles explode under certain circumstances. This patch tracks
the number of each different types of mles and should help us determine
how best to speed up the mastery process.

Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>
Signed-off-by: Mark Fasheh <mfasheh at suse.com>
---
 fs/ocfs2/dlm/dlmcommon.h |    5 ++++-
 fs/ocfs2/dlm/dlmdomain.c |    5 +++++
 fs/ocfs2/dlm/dlmmaster.c |    5 +++++
 3 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 3024f60..c339172 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -52,7 +52,8 @@
 enum dlm_mle_type {
 	DLM_MLE_BLOCK,
 	DLM_MLE_MASTER,
-	DLM_MLE_MIGRATION
+	DLM_MLE_MIGRATION,
+	DLM_MLE_NUM_TYPES
 };
 
 struct dlm_lock_name {
@@ -156,6 +157,8 @@ struct dlm_ctxt
 	struct list_head mle_hb_events;
 
 	/* these give a really vague idea of the system load */
+	atomic_t mle_tot_count[DLM_MLE_NUM_TYPES];
+	atomic_t mle_cur_count[DLM_MLE_NUM_TYPES];
 	atomic_t local_resources;
 	atomic_t remote_resources;
 	atomic_t unknown_resources;
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 780e0d7..49a3ae0 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -1608,6 +1608,11 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
 	atomic_set(&dlm->remote_resources, 0);
 	atomic_set(&dlm->unknown_resources, 0);
 
+	for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
+		atomic_set(&dlm->mle_tot_count[i], 0);
+		atomic_set(&dlm->mle_cur_count[i], 0);
+	}
+
 	spin_lock_init(&dlm->work_lock);
 	INIT_LIST_HEAD(&dlm->work_list);
 	KAPI_INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work, dlm);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 699c6d0..c53041b 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -325,6 +325,9 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
 		mle->u.mlename.hash = dlm_lockid_hash(name, namelen);
 	}
 
+	atomic_inc(&dlm->mle_tot_count[mle->type]);
+	atomic_inc(&dlm->mle_cur_count[mle->type]);
+
 	/* copy off the node_map and register hb callbacks on our copy */
 	memcpy(mle->node_map, dlm->domain_map, sizeof(mle->node_map));
 	memcpy(mle->vote_map, dlm->domain_map, sizeof(mle->vote_map));
@@ -467,6 +470,8 @@ static void dlm_mle_release(struct kref *kref)
 	/* detach the mle from the domain node up/down events */
 	__dlm_mle_detach_hb_events(dlm, mle);
 
+	atomic_dec(&dlm->mle_cur_count[mle->type]);
+
 	/* NOTE: kfree under spinlock here.
 	 * if this is bad, we can move this to a freelist. */
 	kmem_cache_free(dlm_mle_cache, mle);
-- 
1.5.6.3