[PATCH v2 4/7] f2fs: add tracepoints for GC threads

[Namjae Jeon <linkinjeon@gmail.com>]

From: Namjae Jeon <namjae.jeon@samsung.com>

Add tracepoints for tracing the garbage collector
threads in f2fs with status of collection & type.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
---
 fs/f2fs/gc.c                |    2 ++
 include/trace/events/f2fs.h |   20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 94b8a0c..93a0c4c 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -23,6 +23,7 @@
 #include "node.h"
 #include "segment.h"
 #include "gc.h"
+#include <trace/events/f2fs.h>
 
 static struct kmem_cache *winode_slab;
 
@@ -237,6 +238,7 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 	unsigned int segno;
 	int nsearched = 0;
 
+	trace_f2fs_get_victim(sbi->sb, gc_type);
 	p.alloc_mode = alloc_mode;
 	select_policy(sbi, gc_type, type, &p);
 
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index d60f3ed..2514326 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -324,6 +324,26 @@ DEFINE_EVENT(f2fs_data_block, f2fs_get_data_block_exit,
 	TP_ARGS(inode, block, ret)
 );
 
+TRACE_EVENT(f2fs_get_victim,
+	TP_PROTO(struct super_block *sb, int gc_type),
+
+	TP_ARGS(sb, gc_type),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(int,	type)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= sb->s_dev;
+		__entry->type	= gc_type;
+	),
+
+	TP_printk("dev %d,%d  GC_type %d ",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		   __entry->type)
+);
+
 #endif /* _TRACE_F2FS_H */
 
  /* This part must be outside protection */
-- 
1.7.9.5