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authorTejun Heo <tj@kernel.org>2013-01-11 13:06:36 -0800
committerJens Axboe <axboe@kernel.dk>2013-01-14 15:00:36 +0100
commit5305cb830834549b9203ad4d009ad5483c5e293f (patch)
tree9781e0181cb1f3c8f6fa2c5ad2de445333383b87 /fs/buffer.c
parentf0059afd3e6e7aa1a0ffc23468b74c43d47660b8 (diff)
downloadop-kernel-dev-5305cb830834549b9203ad4d009ad5483c5e293f.zip
op-kernel-dev-5305cb830834549b9203ad4d009ad5483c5e293f.tar.gz
block: add block_{touch|dirty}_buffer tracepoint
The former is triggered from touch_buffer() and the latter mark_buffer_dirty(). This is part of tracepoint additions to improve visiblity into dirtying / writeback operations for io tracer and userland. v2: Transformed writeback_dirty_buffer to block_dirty_buffer and made it share TP definition with block_touch_buffer. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index a8c2dfb..87ff335 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);
@@ -1119,6 +1121,8 @@ void mark_buffer_dirty(struct buffer_head *bh)
{
WARN_ON_ONCE(!buffer_uptodate(bh));
+ trace_block_dirty_buffer(bh);
+
/*
* Very *carefully* optimize the it-is-already-dirty case.
*
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