Add block_touch_buffer tracepoint which gets triggered on
touch_buffer().
This is part of tracepoint additions to improve visiblity into
dirtying / writeback operations for io tracer and userland.
Signed-off-by: Tejun Heo <t...@kernel.org>
---
fs/buffer.c | 2 ++
include/trace/events/block.h | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/fs/buffer.c b/fs/buffer.c
index a8c2dfb..4d9169d 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -41,6 +41,7 @@
#include <linux/bitops.h>
#include <linux/mpage.h>
#include <linux/bit_spinlock.h>
+#include <trace/events/block.h>
static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
@@ -55,6 +56,7 @@ EXPORT_SYMBOL(init_buffer);
inline void touch_buffer(struct buffer_head *bh)
{
+ trace_block_touch_buffer(bh);
mark_page_accessed(bh->b_page);
}
EXPORT_SYMBOL(touch_buffer);
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index b408f51..e206cc6 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -6,10 +6,35 @@
#include <linux/blktrace_api.h>
#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
#include <linux/tracepoint.h>
#define RWBS_LEN 8
+TRACE_EVENT(block_touch_buffer,
+
+ TP_PROTO(struct buffer_head *bh),
+
+ TP_ARGS(bh),
+
+ TP_STRUCT__entry (
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( size_t, size )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bh->b_bdev->bd_dev;
+ __entry->sector = bh->b_blocknr;
+ __entry->size = bh->b_size;
+ ),
+
+ TP_printk("%d,%d sector=%llu size=%zu",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long long)__entry->sector, __entry->size
+ )
+);
+
DECLARE_EVENT_CLASS(block_rq_with_error,
TP_PROTO(struct request_queue *q, struct request *rq),
--
1.8.0.2
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