linux-kernel - Re: [PATCH v3] blk-throttle: Fix io statistics for cgroup v1

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Message-ID: <ZFppl9jJNqM_GCzS@slm.duckdns.org>
Date:   Tue, 9 May 2023 05:41:11 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Jinke Han <hanjinke.666@...edance.com>
Cc:     josef@...icpanda.com, axboe@...nel.dk, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        songmuchun@...edance.com, andrea.righi@...onical.com
Subject: Re: [PATCH v3] blk-throttle: Fix io statistics for cgroup v1

On Mon, May 08, 2023 at 01:06:31AM +0800, Jinke Han wrote:
> From: Jinke Han <hanjinke.666@...edance.com>
> 
> After commit f382fb0bcef4 ("block: remove legacy IO schedulers"),
> blkio.throttle.io_serviced and blkio.throttle.io_service_bytes become
> the only stable io stats interface of cgroup v1, and these statistics
> are done in the blk-throttle code. But the current code only counts the
> bios that are actually throttled. When the user does not add the throttle
> limit, the io stats for cgroup v1 has nothing. I fix it according to the
> statistical method of v2, and made it count all ios accurately.
> 
> Fixes: a7b36ee6ba29 ("block: move blk-throtl fast path inline")
> Tested-by: Andrea Righi <andrea.righi@...onical.com>
> Signed-off-by: Jinke Han <hanjinke.666@...edance.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun