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authorBart Van Assche <bvanassche@acm.org>2021-06-18 03:44:44 +0300
committerJens Axboe <axboe@kernel.dk>2021-06-22 00:03:40 +0300
commit556910e39249d55e23deaec479f49e7d85bc0d24 (patch)
treea62be8dec496a444ab8e691e406ee33609939246 /block/Kconfig
parentfb44023e70224c3bd9eb949bd3ab66876bd14c56 (diff)
downloadlinux-556910e39249d55e23deaec479f49e7d85bc0d24.tar.xz
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/Kconfig')
-rw-r--r--block/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/block/Kconfig b/block/Kconfig
index 6685578b2a20..e71c63eaaf52 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -162,6 +162,15 @@ config BLK_CGROUP_IOCOST
distributes IO capacity between different groups based on
their share of the overall weight distribution.
+config BLK_CGROUP_IOPRIO
+ bool "Cgroup I/O controller for assigning an I/O priority class"
+ depends on BLK_CGROUP
+ help
+ Enable the .prio interface for assigning an I/O priority class to
+ requests. The I/O priority class affects the order in which an I/O
+ scheduler and block devices process requests. Only some I/O schedulers
+ and some block devices support I/O priorities.
+
config BLK_DEBUG_FS
bool "Block layer debugging information in debugfs"
default y