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Commit 87c6a9b2 authored by Jens Axboe's avatar Jens Axboe
Browse files

writeback: make balance_dirty_pages() gradually back more off 



Currently it just sleeps for a very short time, just 1 jiffy. If
we keep looping in there, continually delay for a little longer
of up to 100msec in total. That was the old limit for congestion
wait.

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 3542a5c0

mm/page-writeback.c

+10 −1
Original line number Diff line number Diff line
@@ -485,6 +485,7 @@ static void balance_dirty_pages(struct address_space *mapping) 
	unsigned long bdi_thresh;

	unsigned long pages_written = 0;

	unsigned long write_chunk = sync_writeback_pages();

	unsigned long pause = 1;



	struct backing_dev_info *bdi = mapping->backing_dev_info;
@@ -561,7 +562,15 @@ static void balance_dirty_pages(struct address_space *mapping) 
		if (pages_written >= write_chunk)

			break;		/* We've done our duty */



		schedule_timeout_interruptible(1);

		schedule_timeout_interruptible(pause);



		/*

		 * Increase the delay for each loop, up to our previous

		 * default of taking a 100ms nap.

		 */

		pause <<= 1;

		if (pause > HZ / 10)

			pause = HZ / 10;

	}



	if (bdi_nr_reclaimable + bdi_nr_writeback < bdi_thresh &&