linux-kernel - Re: [PATCH V4 11/15] blk-throttle: add interface to configure think time threshold

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Date:   Wed, 23 Nov 2016 16:32:43 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kernel-team@...com, axboe@...com, vgoyal@...hat.com
Subject: Re: [PATCH V4 11/15] blk-throttle: add interface to configure think
 time threshold

On Mon, Nov 14, 2016 at 02:22:18PM -0800, Shaohua Li wrote:
> Add interface to configure the threshold
> 
> Signed-off-by: Shaohua Li <shli@...com>
> ---
>  block/blk-sysfs.c    |  7 +++++++
>  block/blk-throttle.c | 25 +++++++++++++++++++++++++
>  block/blk.h          |  4 ++++
>  3 files changed, 36 insertions(+)
> 
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index 3e284e4..f15aeed 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -532,6 +532,12 @@ static struct queue_sysfs_entry throtl_slice_entry = {
>  	.show = blk_throtl_slice_show,
>  	.store = blk_throtl_slice_store,
>  };
> +
> +static struct queue_sysfs_entry throtl_idle_threshold_entry = {
> +	.attr = {.name = "throttling_idle_threshold", .mode = S_IRUGO | S_IWUSR },
> +	.show = blk_throtl_idle_threshold_show,
> +	.store = blk_throtl_idle_threshold_store,
> +};

Shouldn't this be a per-cgroup setting along with latency target?
These two are the parameters which define how the cgroup should be
treated time-wise.

Thanks.

-- 
tejun