[PATCH 4/5] xfs: add tracepoints to AGF/AGI read operations

Dave Chinner
2013-11-01T04:27:41Z

From: Dave Chinner <dchinner@redhat.com>

To help track down AGI/AGF lock ordering issues, I added these
tracepoints to tell us when an AGI or AGF is read and locked. With
these we can now determine if the lock ordering goes wrong from
tracing captures.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_alloc.c | 5 ++++-
fs/xfs/xfs_ialloc.c | 6 +++++-
fs/xfs/xfs_trace.h | 25 +++++++++++++++++++++++++
3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index bcf1652..9eab2df 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -2294,6 +2294,8 @@ xfs_read_agf(
{
int error;

+ trace_xfs_read_agf(mp, agno);
+
ASSERT(agno != NULLAGNUMBER);
error = xfs_trans_read_buf(
mp, tp, mp->m_ddev_targp,
@@ -2324,8 +2326,9 @@ xfs_alloc_read_agf(
struct xfs_perag *pag; /* per allocation group data */
int error;

- ASSERT(agno != NULLAGNUMBER);
+ trace_xfs_alloc_read_agf(mp, agno);

+ ASSERT(agno != NULLAGNUMBER);
error = xfs_read_agf(mp, tp, agno,
(flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0,
bpp);
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 14d732f..e87719c 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -40,6 +40,7 @@
#include "xfs_icreate_item.h"
#include "xfs_icache.h"
#include "xfs_dinode.h"
+#include "xfs_trace.h"

/*
@@ -1627,8 +1628,9 @@ xfs_read_agi(
{
int error;

- ASSERT(agno != NULLAGNUMBER);
+ trace_xfs_read_agi(mp, agno);

+ ASSERT(agno != NULLAGNUMBER);
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
XFS_FSS_TO_BB(mp, 1), 0, bpp, &xfs_agi_buf_ops);
@@ -1651,6 +1653,8 @@ xfs_ialloc_read_agi(
struct xfs_perag *pag; /* per allocation group data */
int error;

+ trace_xfs_ialloc_read_agi(mp, agno);
+
error = xfs_read_agi(mp, tp, agno, bpp);
if (error)
return error;
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index f195476..425dfa4 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -135,6 +135,31 @@ DEFINE_PERAG_REF_EVENT(xfs_perag_clear_reclaim);
DEFINE_PERAG_REF_EVENT(xfs_perag_set_eofblocks);
DEFINE_PERAG_REF_EVENT(xfs_perag_clear_eofblocks);

+DECLARE_EVENT_CLASS(xfs_ag_class,
+ TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno),
+ TP_ARGS(mp, agno),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(xfs_agnumber_t, agno)
+ ),
+ TP_fast_assign(
+ __entry->dev = mp->m_super->s_dev;
+ __entry->agno = agno;
+ ),
+ TP_printk("dev %d:%d agno %u",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->agno)
+);
+#define DEFINE_AG_EVENT(name) \
+DEFINE_EVENT(xfs_ag_class, name, \
+ TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno), \
+ TP_ARGS(mp, agno))
+
+DEFINE_AG_EVENT(xfs_read_agf);
+DEFINE_AG_EVENT(xfs_alloc_read_agf);
+DEFINE_AG_EVENT(xfs_read_agi);
+DEFINE_AG_EVENT(xfs_ialloc_read_agi);
+
TRACE_EVENT(xfs_attr_list_node_descend,
TP_PROTO(struct xfs_attr_list_context *ctx,
struct xfs_da_node_entry *btree),
--
1.8.4.rc3