linux/block/blk-ioprio.h
Bart Van Assche 556910e392 block: Introduce the ioprio rq-qos policy
Introduce an rq-qos policy that assigns an I/O priority to requests based
on blk-cgroup configuration settings. This policy has the following
advantages over the ioprio_set() system call:
- This policy is cgroup based so it has all the advantages of cgroups.
- While ioprio_set() does not affect page cache writeback I/O, this rq-qos
  controller affects page cache writeback I/O for filesystems that support
  assiociating a cgroup with writeback I/O. See also
  Documentation/admin-guide/cgroup-v2.rst.

Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20210618004456.7280-5-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-06-21 15:03:40 -06:00

20 lines
332 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BLK_IOPRIO_H_
#define _BLK_IOPRIO_H_
#include <linux/kconfig.h>
struct request_queue;
#ifdef CONFIG_BLK_CGROUP_IOPRIO
int blk_ioprio_init(struct request_queue *q);
#else
static inline int blk_ioprio_init(struct request_queue *q)
{
return 0;
}
#endif
#endif /* _BLK_IOPRIO_H_ */