[PATCH 2/3] f2fs: add a tracepoint for background gc

[Jaegeuk Kim <jaegeuk@kernel.org>]

This patch introduces a tracepoint to monitor background gc behaviors.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/gc.c                |  3 +++
 include/trace/events/f2fs.h | 28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e627c19..e7cec86 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -77,6 +77,9 @@ static int gc_thread_func(void *data)
 
 		stat_inc_bggc_count(sbi);
 
+		trace_f2fs_background_gc(sbi->sb, wait_ms,
+				prefree_segments(sbi), free_segments(sbi));
+
 		/* if return value is not zero, no victim was selected */
 		if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC)))
 			wait_ms = gc_th->no_gc_sleep_time;
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 6aa63d9..7de751d 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -514,6 +514,34 @@ TRACE_EVENT(f2fs_map_blocks,
 		__entry->ret)
 );
 
+TRACE_EVENT(f2fs_background_gc,
+
+	TP_PROTO(struct super_block *sb, long wait_ms,
+			unsigned int prefree, unsigned int free),
+
+	TP_ARGS(sb, wait_ms, prefree, free),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(long,	wait_ms)
+		__field(unsigned int,	prefree)
+		__field(unsigned int,	free)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= sb->s_dev;
+		__entry->wait_ms	= wait_ms;
+		__entry->prefree	= prefree;
+		__entry->free		= free;
+	),
+
+	TP_printk("dev = (%d,%d), wait_ms = %ld, prefree = %u, free = %u",
+		show_dev(__entry),
+		__entry->wait_ms,
+		__entry->prefree,
+		__entry->free)
+);
+
 TRACE_EVENT(f2fs_get_victim,
 
 	TP_PROTO(struct super_block *sb, int type, int gc_type,
-- 
2.1.1


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