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authorFam Zheng <zhengfeiran@bytedance.com>2019-08-28 11:54:53 +0800
committerJens Axboe <axboe@kernel.dk>2019-09-06 14:33:52 -0600
commit795fe54c2a828099e461e8c36b04210b2df462ed (patch)
tree8b35881273bccb732e50632af0b9146fe23a9b58 /block/bfq-iosched.h
parent5ff047e32812f57c13389c4a9cdb1427620b3a6f (diff)
bfq: Add per-device weight
This adds to BFQ the missing per-device weight interfaces: blkio.bfq.weight_device on legacy and io.bfq.weight on unified. The implementation pretty closely resembles what we had in CFQ and the parsing code is basically reused. Tests ===== Using two cgroups and three block devices, having weights setup as: Cgroup test1 test2 ============================================ default 100 500 sda 500 100 sdb default default sdc 200 200 cgroup v1 runs -------------- sda.test1.out: READ: bw=913MiB/s sda.test2.out: READ: bw=183MiB/s sdb.test1.out: READ: bw=213MiB/s sdb.test2.out: READ: bw=1054MiB/s sdc.test1.out: READ: bw=650MiB/s sdc.test2.out: READ: bw=650MiB/s cgroup v2 runs -------------- sda.test1.out: READ: bw=915MiB/s sda.test2.out: READ: bw=184MiB/s sdb.test1.out: READ: bw=216MiB/s sdb.test2.out: READ: bw=1069MiB/s sdc.test1.out: READ: bw=621MiB/s sdc.test2.out: READ: bw=622MiB/s Signed-off-by: Fam Zheng <zhengfeiran@bytedance.com> Acked-by: Tejun Heo <tj@kernel.org> Reviewed-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-iosched.h')
-rw-r--r--block/bfq-iosched.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index e80adf822bbe..5d1a519640f6 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -168,6 +168,9 @@ struct bfq_entity {
/* budget, used also to calculate F_i: F_i = S_i + @budget / @weight */
int budget;
+ /* device weight, if non-zero, it overrides the default weight of
+ * bfq_group_data */
+ int dev_weight;
/* weight of the queue */
int weight;
/* next weight if a change is in progress */