[PATCH 1/2] xfs: add iclog state trace events

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

For the DEBUGS!

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_log.c   | 18 ++++++++++++++++
 fs/xfs/xfs_trace.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index e921b554b683..54fd6a695bb5 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -524,6 +524,7 @@ __xlog_state_release_iclog(
 		iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn);
 		xlog_verify_tail_lsn(log, iclog, tail_lsn);
 		/* cycle incremented when incrementing curr_block */
+		trace_xlog_iclog_syncing(iclog, _RET_IP_);
 		return true;
 	}
 
@@ -543,6 +544,7 @@ xlog_state_release_iclog(
 {
 	lockdep_assert_held(&log->l_icloglock);
 
+	trace_xlog_iclog_release(iclog, _RET_IP_);
 	if (iclog->ic_state == XLOG_STATE_IOERROR)
 		return -EIO;
 
@@ -804,6 +806,7 @@ xlog_wait_on_iclog(
 {
 	struct xlog		*log = iclog->ic_log;
 
+	trace_xlog_iclog_wait_on(iclog, _RET_IP_);
 	if (!XLOG_FORCED_SHUTDOWN(log) &&
 	    iclog->ic_state != XLOG_STATE_ACTIVE &&
 	    iclog->ic_state != XLOG_STATE_DIRTY) {
@@ -1804,6 +1807,7 @@ xlog_write_iclog(
 	unsigned int		count)
 {
 	ASSERT(bno < log->l_logBBsize);
+	trace_xlog_iclog_write(iclog, _RET_IP_);
 
 	/*
 	 * We lock the iclogbufs here so that we can serialise against I/O
@@ -1950,6 +1954,7 @@ xlog_sync(
 	unsigned int		size;
 
 	ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
+	trace_xlog_iclog_sync(iclog, _RET_IP_);
 
 	count = xlog_calc_iclog_size(log, iclog, &roundoff);
 
@@ -2488,6 +2493,7 @@ xlog_state_activate_iclog(
 	int			*iclogs_changed)
 {
 	ASSERT(list_empty_careful(&iclog->ic_callbacks));
+	trace_xlog_iclog_activate(iclog, _RET_IP_);
 
 	/*
 	 * If the number of ops in this iclog indicate it just contains the
@@ -2577,6 +2583,8 @@ xlog_state_clean_iclog(
 {
 	int			iclogs_changed = 0;
 
+	trace_xlog_iclog_clean(dirty_iclog, _RET_IP_);
+
 	dirty_iclog->ic_state = XLOG_STATE_DIRTY;
 
 	xlog_state_activate_iclogs(log, &iclogs_changed);
@@ -2636,6 +2644,7 @@ xlog_state_set_callback(
 	struct xlog_in_core	*iclog,
 	xfs_lsn_t		header_lsn)
 {
+	trace_xlog_iclog_callback(iclog, _RET_IP_);
 	iclog->ic_state = XLOG_STATE_CALLBACK;
 
 	ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn),
@@ -2717,6 +2726,7 @@ xlog_state_do_iclog_callbacks(
 		__releases(&log->l_icloglock)
 		__acquires(&log->l_icloglock)
 {
+	trace_xlog_iclog_callbacks_start(iclog, _RET_IP_);
 	spin_unlock(&log->l_icloglock);
 	spin_lock(&iclog->ic_callback_lock);
 	while (!list_empty(&iclog->ic_callbacks)) {
@@ -2736,6 +2746,7 @@ xlog_state_do_iclog_callbacks(
 	 */
 	spin_lock(&log->l_icloglock);
 	spin_unlock(&iclog->ic_callback_lock);
+	trace_xlog_iclog_callbacks_done(iclog, _RET_IP_);
 }
 
 STATIC void
@@ -2827,6 +2838,7 @@ xlog_state_done_syncing(
 
 	spin_lock(&log->l_icloglock);
 	ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
+	trace_xlog_iclog_sync_done(iclog, _RET_IP_);
 
 	/*
 	 * If we got an error, either on the first buffer, or in the case of
@@ -2899,6 +2911,8 @@ xlog_state_get_iclog_space(
 	atomic_inc(&iclog->ic_refcnt);	/* prevents sync */
 	log_offset = iclog->ic_offset;
 
+	trace_xlog_iclog_get_space(iclog, _RET_IP_);
+
 	/* On the 1st write to an iclog, figure out lsn.  This works
 	 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
 	 * committing to.  If the offset is set, that's how many blocks
@@ -3056,6 +3070,7 @@ xlog_state_switch_iclogs(
 {
 	ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
 	assert_spin_locked(&log->l_icloglock);
+	trace_xlog_iclog_switch(iclog, _RET_IP_);
 
 	if (!eventual_size)
 		eventual_size = iclog->ic_offset;
@@ -3138,6 +3153,8 @@ xfs_log_force(
 	if (iclog->ic_state == XLOG_STATE_IOERROR)
 		goto out_error;
 
+	trace_xlog_iclog_force(iclog, _RET_IP_);
+
 	if (iclog->ic_state == XLOG_STATE_DIRTY ||
 	    (iclog->ic_state == XLOG_STATE_ACTIVE &&
 	     atomic_read(&iclog->ic_refcnt) == 0 && iclog->ic_offset == 0)) {
@@ -3225,6 +3242,7 @@ xlog_force_lsn(
 		goto out_error;
 
 	while (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) {
+		trace_xlog_iclog_force_lsn(iclog, _RET_IP_);
 		iclog = iclog->ic_next;
 		if (iclog == log->l_iclog)
 			goto out_unlock;
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 71dca776c110..79ee973ba1ed 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -24,6 +24,7 @@ struct xlog_ticket;
 struct xlog_recover;
 struct xlog_recover_item;
 struct xlog_rec_header;
+struct xlog_in_core;
 struct xfs_buf_log_format;
 struct xfs_inode_log_format;
 struct xfs_bmbt_irec;
@@ -3927,6 +3928,57 @@ DEFINE_EVENT(xfs_icwalk_class, name,	\
 DEFINE_ICWALK_EVENT(xfs_ioc_free_eofblocks);
 DEFINE_ICWALK_EVENT(xfs_blockgc_free_space);
 
+DECLARE_EVENT_CLASS(xlog_iclog_class,
+	TP_PROTO(struct xlog_in_core *iclog, unsigned long caller_ip),
+	TP_ARGS(iclog, caller_ip),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(uint32_t, state)
+		__field(int32_t, refcount)
+		__field(uint32_t, offset)
+		__field(unsigned long long, lsn)
+		__field(unsigned long, caller_ip)
+	),
+	TP_fast_assign(
+		__entry->dev = iclog->ic_log->l_mp->m_super->s_dev;
+		__entry->state = iclog->ic_state;
+		__entry->refcount = atomic_read(&iclog->ic_refcnt);
+		__entry->offset = iclog->ic_offset;
+		__entry->lsn = be64_to_cpu(iclog->ic_header.h_lsn);
+		__entry->caller_ip = caller_ip;
+	),
+	TP_printk("dev %d:%d state 0x%x refcnt %d offset %u lsn 0x%llx caller %pS",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->state,
+		  __entry->refcount,
+		  __entry->offset,
+		  __entry->lsn,
+		  (char *)__entry->caller_ip)
+
+);
+
+#define DEFINE_ICLOG_EVENT(name)	\
+DEFINE_EVENT(xlog_iclog_class, name,	\
+	TP_PROTO(struct xlog_in_core *iclog, unsigned long caller_ip), \
+	TP_ARGS(iclog, caller_ip))
+
+DEFINE_ICLOG_EVENT(xlog_iclog_activate);
+DEFINE_ICLOG_EVENT(xlog_iclog_clean);
+DEFINE_ICLOG_EVENT(xlog_iclog_callback);
+DEFINE_ICLOG_EVENT(xlog_iclog_callbacks_start);
+DEFINE_ICLOG_EVENT(xlog_iclog_callbacks_done);
+DEFINE_ICLOG_EVENT(xlog_iclog_force);
+DEFINE_ICLOG_EVENT(xlog_iclog_force_lsn);
+DEFINE_ICLOG_EVENT(xlog_iclog_get_space);
+DEFINE_ICLOG_EVENT(xlog_iclog_release);
+DEFINE_ICLOG_EVENT(xlog_iclog_switch);
+DEFINE_ICLOG_EVENT(xlog_iclog_sync);
+DEFINE_ICLOG_EVENT(xlog_iclog_syncing);
+DEFINE_ICLOG_EVENT(xlog_iclog_sync_done);
+DEFINE_ICLOG_EVENT(xlog_iclog_want_sync);
+DEFINE_ICLOG_EVENT(xlog_iclog_wait_on);
+DEFINE_ICLOG_EVENT(xlog_iclog_write);
+
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
2.31.1