Commit 7c2c57c9 authored Jul 03, 2012 by majianpeng Committed by NeilBrown Jul 03, 2012

md:Add blk_plug in sync_thread.



Add blk_plug in sync_thread will increase the performance of sync.
Because sync_thread did not blk_plug,so when raid sync, the bio merge
not well.

Testing environment:
SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI
Controller.
OS:Linux xxx 3.5.0-rc2+ #340 SMP Tue Jun 12 09:00:25 CST 2012
x86_64 x86_64 x86_64 GNU/Linux.
RAID5: four ST31000524NS disk.

Without blk_plug:recovery speed about 63M/Sec;
Add blk_plug:recovery speed about 120M/Sec.

Using blktrace:
blktrace -d /dev/sdb -w 60  -o -|blkparse -i -

without blk_plug:
Total (8,16):
 Reads Queued:      309811,     1239MiB	 Writes Queued:           0,        0KiB
 Read Dispatches:   283583,     1189MiB	 Write Dispatches:        0,        0KiB
 Reads Requeued:         0		 Writes Requeued:         0
 Reads Completed:   273351,     1149MiB	 Writes Completed:        0,        0KiB
 Read Merges:        23533,    94132KiB	 Write Merges:            0,        0KiB
 IO unplugs:             0        	 Timer unplugs:           0

add blk_plug:
Total (8,16):
 Reads Queued:      428697,     1714MiB	 Writes Queued:           0,        0KiB
 Read Dispatches:     3954,     1714MiB	 Write Dispatches:        0,        0KiB
 Reads Requeued:         0		 Writes Requeued:         0
 Reads Completed:     3956,     1715MiB	 Writes Completed:        0,        0KiB
 Read Merges:       424743,     1698MiB	 Write Merges:            0,        0KiB
 IO unplugs:             0        	 Timer unplugs:        3384

The ratio of merge will be markedly increased.

Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

parent 1850753d

drivers/md/md.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -7298,6 +7298,7 @@ void md_do_sync(struct mddev *mddev)
		int skipped = 0;
		struct md_rdev *rdev;
		char *desc;
		struct blk_plug plug;

		/* just incase thread restarts... */
		if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
		@@ -7447,6 +7448,7 @@ void md_do_sync(struct mddev *mddev)
		}
		mddev->curr_resync_completed = j;

		blk_start_plug(&plug);
		while (j < max_sectors) {
		sector_t sectors;

		@@ -7552,6 +7554,7 @@ void md_do_sync(struct mddev *mddev)
		* this also signals 'finished resyncing' to md_stop
		*/
		out:
		blk_finish_plug(&plug);
		wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));

		/* tell personality that we are finished */

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