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Commit 2ab1ba68 authored by Chris Mason's avatar Chris Mason
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Btrfs: force unplugs when switching from high to regular priority bios 



Btrfs does bio submissions from a worker thread, and each device
has a list of high priority bios and regular priority bios.

Synchronous writes go to the high priority thread while async writes
go to regular list.  This commit brings back an explicit unplug
any time we switch from high to regular priority, which makes it
easier for the block layer to give us low latencies.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 0d10ee2e

fs/btrfs/volumes.c

+17 −0
Original line number Diff line number Diff line
@@ -142,6 +142,7 @@ static noinline int run_scheduled_bios(struct btrfs_device *device) 
	unsigned long limit;

	unsigned long last_waited = 0;

	int force_reg = 0;

	int sync_pending;

	struct blk_plug plug;



	/*
@@ -229,6 +230,22 @@ static noinline int run_scheduled_bios(struct btrfs_device *device) 


		BUG_ON(atomic_read(&cur->bi_cnt) == 0);



		/*

		 * if we're doing the sync list, record that our

		 * plug has some sync requests on it

		 *

		 * If we're doing the regular list and there are

		 * sync requests sitting around, unplug before

		 * we add more

		 */

		if (pending_bios == &device->pending_sync_bios) {

			sync_pending = 1;

		} else if (sync_pending) {

			blk_finish_plug(&plug);

			blk_start_plug(&plug);

			sync_pending = 0;

		}



		submit_bio(cur->bi_rw, cur);

		num_run++;

		batch_run++;