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Bart Van Assche
556910e392
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 <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Ming Lei <[email protected]> Cc: Johannes Thumshirn <[email protected]> Cc: Himanshu Madhani <[email protected]> Signed-off-by: Bart Van Assche <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
20 lines
332 B
C
20 lines
332 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BLK_IOPRIO_H_
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#define _BLK_IOPRIO_H_
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#include <linux/kconfig.h>
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struct request_queue;
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#ifdef CONFIG_BLK_CGROUP_IOPRIO
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int blk_ioprio_init(struct request_queue *q);
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#else
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static inline int blk_ioprio_init(struct request_queue *q)
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{
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return 0;
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}
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#endif
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#endif /* _BLK_IOPRIO_H_ */
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