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authorDave Chinner <dchinner@redhat.com>2012-04-24 16:33:31 +1000
committerBen Myers <bpm@sgi.com>2012-05-21 10:45:44 -0500
commit14c26c6a05de138a4fd9a0c05ff8e7435a618324 (patch)
treec916866e4e9ac21d5f3400edf3eb8186ea7740af /fs/xfs/xfs_trace.h
parent3ba316037470bbf98c8a16c2179c02794fb8862e (diff)
xfs: add trace points for log forces
To enable easy tracing of the location of log forces and the frequency of them via perf, add a pair of trace points to the log force functions. This will help debug where excessive log forces are being issued from by simple perf commands like: # ~/perf/perf top -e xfs:xfs_log_force -G -U Which gives this sort of output: Events: 141 xfs:xfs_log_force - 100.00% [kernel] [k] xfs_log_force - xfs_log_force 87.04% xfsaild kthread kernel_thread_helper - 12.87% xfs_buf_lock _xfs_buf_find xfs_buf_get xfs_trans_get_buf xfs_da_do_buf xfs_da_get_buf xfs_dir2_data_init xfs_dir2_leaf_addname xfs_dir_createname xfs_create xfs_vn_mknod xfs_vn_create vfs_create do_last.isra.41 path_openat do_filp_open do_sys_open sys_open system_call_fastpath Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sig.com>
Diffstat (limited to 'fs/xfs/xfs_trace.h')
-rw-r--r--fs/xfs/xfs_trace.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index febff43176f..7cf9d3529e5 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -874,6 +874,22 @@ DECLARE_EVENT_CLASS(xfs_log_item_class,
__print_flags(__entry->flags, "|", XFS_LI_FLAGS))
)
+TRACE_EVENT(xfs_log_force,
+ TP_PROTO(struct xfs_mount *mp, xfs_lsn_t lsn),
+ TP_ARGS(mp, lsn),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(xfs_lsn_t, lsn)
+ ),
+ TP_fast_assign(
+ __entry->dev = mp->m_super->s_dev;
+ __entry->lsn = lsn;
+ ),
+ TP_printk("dev %d:%d lsn 0x%llx",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->lsn)
+)
+
#define DEFINE_LOG_ITEM_EVENT(name) \
DEFINE_EVENT(xfs_log_item_class, name, \
TP_PROTO(struct xfs_log_item *lip), \