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authorBart Van Assche <bvanassche@acm.org>2021-06-17 17:44:44 -0700
committerJens Axboe <axboe@kernel.dk>2021-06-21 15:03:40 -0600
commit556910e39249d55e23deaec479f49e7d85bc0d24 (patch)
treea62be8dec496a444ab8e691e406ee33609939246 /block/blk-mq-debugfs.c
parentfb44023e70224c3bd9eb949bd3ab66876bd14c56 (diff)
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>
Diffstat (limited to 'block/blk-mq-debugfs.c')
-rw-r--r--block/blk-mq-debugfs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 6ac1c86f62ef..4b66d2776eda 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -946,6 +946,8 @@ static const char *rq_qos_id_to_name(enum rq_qos_id id)
return "latency";
case RQ_QOS_COST:
return "cost";
+ case RQ_QOS_IOPRIO:
+ return "ioprio";
}
return "unknown";
}