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From: "Theodore Ts'o" <tytso@mit.edu>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linux Kernel Developers List <linux-kernel@vger.kernel.org>,
       "Theodore Ts'o" <tytso@mit.edu>
Subject: [PATCH 1/2] jbd2: Convert instrumentation from markers to tracepoints
Date: Sun, 12 Apr 2009 13:32:45 -0400
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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 fs/jbd2/checkpoint.c              |    7 ++-
 fs/jbd2/commit.c                  |   14 +++--
 include/trace/jbd2.h              |    9 ++++
 include/trace/jbd2_event_types.h  |   93 +++++++++++++++++++++++++++++++++++++
 include/trace/trace_event_types.h |    1 +
 include/trace/trace_events.h      |    1 +
 6 files changed, 116 insertions(+), 9 deletions(-)
 create mode 100644 include/trace/jbd2.h
 create mode 100644 include/trace/jbd2_event_types.h

diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 17159ca..2b794d9 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -20,9 +20,11 @@
 #include <linux/time.h>
 #include <linux/fs.h>
 #include <linux/jbd2.h>
-#include <linux/marker.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <trace/jbd2.h>
+
+DEFINE_TRACE(jbd2_checkpoint);
 
 /*
  * Unlink a buffer from a transaction checkpoint list.
@@ -358,8 +360,7 @@ int jbd2_log_do_checkpoint(journal_t *journal)
 	 * journal straight away.
 	 */
 	result = jbd2_cleanup_journal_tail(journal);
-	trace_mark(jbd2_checkpoint, "dev %s need_checkpoint %d",
-		   journal->j_devname, result);
+	trace_jbd2_checkpoint(journal, result);
 	jbd_debug(1, "cleanup_journal_tail returned %d\n", result);
 	if (result <= 0)
 		return result;
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 073c8c3..21462a8 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -16,7 +16,6 @@
 #include <linux/time.h>
 #include <linux/fs.h>
 #include <linux/jbd2.h>
-#include <linux/marker.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
@@ -26,6 +25,11 @@
 #include <linux/writeback.h>
 #include <linux/backing-dev.h>
 #include <linux/bio.h>
+#include <trace/jbd2.h>
+
+DEFINE_TRACE(jbd2_start_commit);
+DEFINE_TRACE(jbd2_end_commit);
+DEFINE_TRACE(jbd2_submit_inode_data);
 
 /*
  * Default IO end handler for temporary BJ_IO buffer_heads.
@@ -253,6 +257,7 @@ static int journal_submit_data_buffers(journal_t *journal,
 		 * block allocation  with delalloc. We need to write
 		 * only allocated blocks here.
 		 */
+		trace_jbd2_submit_inode_data(jinode->i_vfs_inode);
 		err = journal_submit_inode_data_buffers(mapping);
 		if (!ret)
 			ret = err;
@@ -394,8 +399,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 	commit_transaction = journal->j_running_transaction;
 	J_ASSERT(commit_transaction->t_state == T_RUNNING);
 
-	trace_mark(jbd2_start_commit, "dev %s transaction %d",
-		   journal->j_devname, commit_transaction->t_tid);
+	trace_jbd2_start_commit(journal, commit_transaction);
 	jbd_debug(1, "JBD: starting commit of transaction %d\n",
 			commit_transaction->t_tid);
 
@@ -1053,9 +1057,7 @@ restart_loop:
 	if (journal->j_commit_callback)
 		journal->j_commit_callback(journal, commit_transaction);
 
-	trace_mark(jbd2_end_commit, "dev %s transaction %d head %d",
-		   journal->j_devname, commit_transaction->t_tid,
-		   journal->j_tail_sequence);
+	trace_jbd2_end_commit(journal, commit_transaction);
 	jbd_debug(1, "JBD: commit %d complete, head %d\n",
 		  journal->j_commit_sequence, journal->j_tail_sequence);
 	if (to_free)
diff --git a/include/trace/jbd2.h b/include/trace/jbd2.h
new file mode 100644
index 0000000..68a93a5
--- /dev/null
+++ b/include/trace/jbd2.h
@@ -0,0 +1,9 @@
+#ifndef _TRACE_JBD2_H
+#define _TRACE_JBD2_H
+
+#include <linux/jbd2.h>
+#include <linux/tracepoint.h>
+
+#include <trace/jbd2_event_types.h>
+
+#endif
diff --git a/include/trace/jbd2_event_types.h b/include/trace/jbd2_event_types.h
new file mode 100644
index 0000000..c550ef4
--- /dev/null
+++ b/include/trace/jbd2_event_types.h
@@ -0,0 +1,93 @@
+
+/* use <trace/jbd2.h> instead */
+#ifndef TRACE_EVENT
+# error Do not include this file directly.
+# error Unless you know what you are doing.
+#endif
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM jbd2
+
+#include <linux/jbd2.h>
+
+TRACE_EVENT(jbd2_checkpoint,
+
+	TP_PROTO(journal_t *journal, int result),
+
+	TP_ARGS(journal, result),
+
+	TP_STRUCT__entry(
+		__array(	char,	devname, BDEVNAME_SIZE+24 )
+		__field(	int,	result			)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->devname, journal->j_devname, BDEVNAME_SIZE+24);
+		__entry->result		= result;
+	),
+
+	TP_printk("dev %s result %d",
+		  __entry->devname, __entry->result)
+);
+
+TRACE_EVENT(jbd2_start_commit,
+
+	TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
+
+	TP_ARGS(journal, commit_transaction),
+
+	TP_STRUCT__entry(
+		__array(	char,	devname, BDEVNAME_SIZE+24 )
+		__field(	int,	transaction		  )
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->devname, journal->j_devname, BDEVNAME_SIZE+24);
+		__entry->transaction	= commit_transaction->t_tid;
+	),
+
+	TP_printk("dev %s transaction %d",
+		  __entry->devname, __entry->transaction)
+);
+
+TRACE_EVENT(jbd2_end_commit,
+	TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
+
+	TP_ARGS(journal, commit_transaction),
+
+	TP_STRUCT__entry(
+		__array(	char,	devname, BDEVNAME_SIZE+24 )
+		__field(	int,	transaction		  )
+		__field(	int,	head		  	  )
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->devname, journal->j_devname, BDEVNAME_SIZE+24);
+		__entry->transaction	= commit_transaction->t_tid;
+		__entry->head		= journal->j_tail_sequence;
+	),
+
+	TP_printk("dev %s transaction %d head %d",
+		  __entry->devname, __entry->transaction, __entry->head)
+);
+
+TRACE_EVENT(jbd2_submit_inode_data,
+	TP_PROTO(struct inode *inode),
+
+	TP_ARGS(inode),
+
+	TP_STRUCT__entry(
+		__array(	char,	devname, 32		)
+		__field(	ino_t,	ino			)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->devname, inode->i_sb->s_id, 32);
+		__entry->ino	= inode->i_ino;
+	),
+
+	TP_printk("dev %s transaction ino %lu",
+		  __entry->devname, __entry->ino)
+);
+
+#undef TRACE_SYSTEM
diff --git a/include/trace/trace_event_types.h b/include/trace/trace_event_types.h
index df56f56..bd26f4d 100644
--- a/include/trace/trace_event_types.h
+++ b/include/trace/trace_event_types.h
@@ -3,3 +3,4 @@
 #include <trace/sched_event_types.h>
 #include <trace/irq_event_types.h>
 #include <trace/lockdep_event_types.h>
+#include <trace/jbd2_event_types.h>
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index fd13750..2a9b970 100644
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -3,3 +3,4 @@
 #include <trace/sched.h>
 #include <trace/irq.h>
 #include <trace/lockdep.h>
+#include <trace/jbd2.h>
-- 
1.5.6.3

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