linux-kernel - Re: [PATCH v2 0/3] Implement BFQ per-device weight interface

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Date:   Mon, 5 Aug 2019 17:08:36 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Fam Zheng <zhengfeiran@...edance.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Fam Zheng <fam@...hon.net>,
        duanxiongchun@...edance.com,
        linux-block <linux-block@...r.kernel.org>, tj@...nel.org,
        cgroups@...r.kernel.org, zhangjiachen.jc@...edance.com
Subject: Re: [PATCH v2 0/3] Implement BFQ per-device weight interface

Thank you very much, Fam, for this extension.

Reviewed-by: Paolo Valente <paolo.valente@...aro.org>

> Il giorno 5 ago 2019, alle ore 08:38, Fam Zheng <zhengfeiran@...edance.com> ha scritto:
> 
> (Revision starting from v2 since v1 was used off-list)
> 
> Hi Paolo and others,
> 
> 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
> 
> Fam Zheng (3):
>  bfq: Fix the missing barrier in __bfq_entity_update_weight_prio
>  bfq: Extract bfq_group_set_weight from bfq_io_set_weight_legacy
>  bfq: Add per-device weight
> 
> block/bfq-cgroup.c  | 151 +++++++++++++++++++++++++++++++++++++++-------------
> block/bfq-iosched.h |   3 ++
> block/bfq-wf2q.c    |   2 +
> 3 files changed, 119 insertions(+), 37 deletions(-)
> 
> -- 
> 2.11.0
>