xfs: some iget tracing cleanups / fixes

The xfs_iget_alloc/found tracepoints are a bit misnamed and misplaced.
Rename them to xfs_iget_hit/xfs_iget_miss and move them to the beggining
of the xfs_iget_cache_hit/miss functions.  Add a new xfs_iget_reclaim_fail
tracepoint for the case where we fail to re-initialize a VFS inode,
and add a second instance of the xfs_iget_skip tracepoint for the case
of a failed igrab() call.

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

2 files changed, 7 insertions, 6 deletions

diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index 3f2eec28c70d..9efe368d38c7 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -561,8 +561,9 @@ DEFINE_EVENT(xfs_iget_class, name, \
         TP_ARGS(ip))
 DEFINE_IGET_EVENT(xfs_iget_skip);
 DEFINE_IGET_EVENT(xfs_iget_reclaim);
-DEFINE_IGET_EVENT(xfs_iget_found);
-DEFINE_IGET_EVENT(xfs_iget_alloc);
+DEFINE_IGET_EVENT(xfs_iget_reclaim_fail);
+DEFINE_IGET_EVENT(xfs_iget_hit);
+DEFINE_IGET_EVENT(xfs_iget_miss);
 
 DECLARE_EVENT_CLASS(xfs_inode_class,
         TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip),
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index 633cb331b9e9..75664d1b9f59 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -208,7 +208,7 @@ xfs_iget_cache_hit(
                         ip->i_flags &= ~XFS_INEW;
                         ip->i_flags |= XFS_IRECLAIMABLE;
                         __xfs_inode_set_reclaim_tag(pag, ip);
-                        trace_xfs_iget_reclaim(ip);
+                        trace_xfs_iget_reclaim_fail(ip);
                         goto out_error;
                 }
 
@@ -223,6 +223,7 @@ xfs_iget_cache_hit(
         } else {
                 /* If the VFS inode is being torn down, pause and try again. */
                 if (!igrab(inode)) {
+                        trace_xfs_iget_skip(ip);
                         error = EAGAIN;
                         goto out_error;
                 }
@@ -230,6 +231,7 @@ xfs_iget_cache_hit(
                 /* We've got a live one. */
                 spin_unlock(&ip->i_flags_lock);
                 read_unlock(&pag->pag_ici_lock);
+                trace_xfs_iget_hit(ip);
         }
 
         if (lock_flags != 0)
@@ -238,7 +240,6 @@ xfs_iget_cache_hit(
         xfs_iflags_clear(ip, XFS_ISTALE);
         XFS_STATS_INC(xs_ig_found);
 
-        trace_xfs_iget_found(ip);
         return 0;
 
 out_error:
@@ -271,7 +272,7 @@ xfs_iget_cache_miss(
         if (error)
                 goto out_destroy;
 
-        xfs_itrace_entry(ip);
+        trace_xfs_iget_miss(ip);
 
         if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
                 error = ENOENT;
@@ -317,7 +318,6 @@ xfs_iget_cache_miss(
         write_unlock(&pag->pag_ici_lock);
         radix_tree_preload_end();
 
-        trace_xfs_iget_alloc(ip);
         *ipp = ip;
         return 0;