linux-kernel - Re: [PATCH v3] block: fix the problem of io

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Date:   Wed, 7 Jul 2021 06:44:03 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     brookxu <brookxu.cn@...il.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] block: fix the problem of io_ticks becoming smaller

On 7/5/21 3:47 PM, brookxu wrote:
> From: Chunguang Xu <brookxu@...cent.com>
> 
> On the IO submission path, blk_account_io_start() may interrupt
> the system interruption. When the interruption returns, the value
> of part->stamp may have been updated by other cores, so the time
> value collected before the interruption may be less than part->
> stamp. So when this happens, we should do nothing to make io_ticks
> more accurate? For kernels less than 5.0, this may cause io_ticks
> to become smaller, which in turn may cause abnormal ioutil values.
> 
> v3: update the commit log
> v2: sorry, fix compile error due to the missed ')'

The version log goes below the '---' in the email, not in the commit
message. I fixed that up. Applied for 5.14, thanks.

-- 
Jens Axboe