xfs: lockless per-ag lookups

When we start taking a reference to the per-ag for every cached
buffer in the system, kernel lockstat profiling on an 8-way create
workload shows the mp->m_perag_lock has higher acquisition rates
than the inode lock and has significantly more contention. That is,
it becomes the highest contended lock in the system.

The perag lookup is trivial to convert to lock-less RCU lookups
because perag structures never go away. Hence the only thing we need
to protect against is tree structure changes during a grow. This can
be done simply by replacing the locking in xfs_perag_get() with RCU
read locking. This removes the mp->m_perag_lock completely from this
path.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 00c7a876807d..14fc6e9e1816 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -199,6 +199,8 @@ xfs_uuid_unmount(
 
 /*
  * Reference counting access wrappers to the perag structures.
+ * Because we never free per-ag structures, the only thing we
+ * have to protect against changes is the tree structure itself.
  */
 struct xfs_perag *
 xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
@@ -206,13 +208,13 @@ xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
         struct xfs_perag        *pag;
         int                     ref = 0;
 
-        spin_lock(&mp->m_perag_lock);
+        rcu_read_lock();
         pag = radix_tree_lookup(&mp->m_perag_tree, agno);
         if (pag) {
                 ASSERT(atomic_read(&pag->pag_ref) >= 0);
                 ref = atomic_inc_return(&pag->pag_ref);
         }
-        spin_unlock(&mp->m_perag_lock);
+        rcu_read_unlock();
         trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
         return pag;
 }
@@ -227,10 +229,18 @@ xfs_perag_put(struct xfs_perag *pag)
         trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
 }
 
+STATIC void
+__xfs_free_perag(
+        struct rcu_head *head)
+{
+        struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
+
+        ASSERT(atomic_read(&pag->pag_ref) == 0);
+        kmem_free(pag);
+}
+
 /*
- * Free up the resources associated with a mount structure.  Assume that
- * the structure was initially zeroed, so we can tell which fields got
- * initialized.
+ * Free up the per-ag resources associated with the mount structure.
  */
 STATIC void
 xfs_free_perag(
@@ -242,10 +252,9 @@ xfs_free_perag(
         for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
                 spin_lock(&mp->m_perag_lock);
                 pag = radix_tree_delete(&mp->m_perag_tree, agno);
-                ASSERT(pag);
-                ASSERT(atomic_read(&pag->pag_ref) == 0);
                 spin_unlock(&mp->m_perag_lock);
-                kmem_free(pag);
+                ASSERT(pag);
+                call_rcu(&pag->rcu_head, __xfs_free_perag);
         }
 }