Commit ab74c7b2 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: indicate via a block bitmap read is prefetched via a tracepoint 



Modify the ext4_read_block_bitmap_load tracepoint so that it tells us
whether a block bitmap is being prefetched.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarArtem Blagodarenko <artem.blagodarenko@gmail.com>
parent 529a781e

fs/ext4/balloc.c

+1 −1
Original line number Diff line number Diff line
@@ -494,7 +494,7 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group, 
	 * submit the buffer_head for reading

	 */

	set_buffer_new(bh);

	trace_ext4_read_block_bitmap_load(sb, block_group);

	trace_ext4_read_block_bitmap_load(sb, block_group, ignore_locked);

	bh->b_end_io = ext4_end_bitmap_read;

	get_bh(bh);

	submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO |

include/trace/events/ext4.h

+20 −4
Original line number Diff line number Diff line
@@ -1312,18 +1312,34 @@ DEFINE_EVENT(ext4__bitmap_load, ext4_mb_buddy_bitmap_load, 
	TP_ARGS(sb, group)

);



DEFINE_EVENT(ext4__bitmap_load, ext4_read_block_bitmap_load,

DEFINE_EVENT(ext4__bitmap_load, ext4_load_inode_bitmap,



	TP_PROTO(struct super_block *sb, unsigned long group),



	TP_ARGS(sb, group)

);



DEFINE_EVENT(ext4__bitmap_load, ext4_load_inode_bitmap,

TRACE_EVENT(ext4_read_block_bitmap_load,

	TP_PROTO(struct super_block *sb, unsigned long group, bool prefetch),



	TP_PROTO(struct super_block *sb, unsigned long group),

	TP_ARGS(sb, group, prefetch),



	TP_ARGS(sb, group)

	TP_STRUCT__entry(

		__field(	dev_t,	dev			)

		__field(	__u32,	group			)

		__field(	bool,	prefetch		)



	),



	TP_fast_assign(

		__entry->dev	= sb->s_dev;

		__entry->group	= group;

		__entry->prefetch = prefetch;

	),



	TP_printk("dev %d,%d group %u prefetch %d",

		  MAJOR(__entry->dev), MINOR(__entry->dev),

		  __entry->group, __entry->prefetch)

);



TRACE_EVENT(ext4_direct_IO_enter,