xfs: Add trace points for per-ag refcount debugging.

Uninline xfs_perag_{get,put} so that tracepoints can be inserted
into them to speed debugging of reference count problems.

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

1 files changed, 27 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index 3353aef50530..1bb09e70b2eb 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -78,6 +78,33 @@ DECLARE_EVENT_CLASS(xfs_attr_list_class,
         )
 )
 
+#define DEFINE_PERAG_REF_EVENT(name) \
+TRACE_EVENT(name, \
+        TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, int refcount, \
+                 unsigned long caller_ip), \
+        TP_ARGS(mp, agno, refcount, caller_ip), \
+        TP_STRUCT__entry( \
+                __field(dev_t, dev) \
+                __field(xfs_agnumber_t, agno) \
+                __field(int, refcount) \
+                __field(unsigned long, caller_ip) \
+        ), \
+        TP_fast_assign( \
+                __entry->dev = mp->m_super->s_dev; \
+                __entry->agno = agno; \
+                __entry->refcount = refcount; \
+                __entry->caller_ip = caller_ip; \
+        ), \
+        TP_printk("dev %d:%d agno %u refcount %d caller %pf", \
+                  MAJOR(__entry->dev), MINOR(__entry->dev), \
+                  __entry->agno, \
+                  __entry->refcount, \
+                  (char *)__entry->caller_ip) \
+);
+
+DEFINE_PERAG_REF_EVENT(xfs_perag_get)
+DEFINE_PERAG_REF_EVENT(xfs_perag_put)
+
 #define DEFINE_ATTR_LIST_EVENT(name) \
 DEFINE_EVENT(xfs_attr_list_class, name, \
         TP_PROTO(struct xfs_attr_list_context *ctx), \