linux-kernel - Re: [RFC] blkio_delay_total is calculated mistakenly

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Message-ID: <20170215030013.GA22460@kroah.com>
Date:   Tue, 14 Feb 2017 19:00:13 -0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Weiwei Jia <harrynjit@...il.com>
Cc:     bsingharora@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] blkio_delay_total is calculated mistakenly

On Tue, Feb 14, 2017 at 08:27:36PM -0500, Weiwei Jia wrote:
> Hi,
> 
> When I read Linux Kernel source codes about how "blkio_delay_total"
> (delay waiting for synchronous block I/O to complete for one task) is
> calculated in Linux/kernel/delayacct.c file [1], I find that
> "blkio_delay_total" adds "task->delays->blkio_delay" to be the total
> delay time for one task to wait for synchronous I/O dynamically but
> "tsk->delays->blkio_delay" has already been calculated as the total
> delay time that one task is waiting for synchronous I/O [2]
> dynamically. I think "blkio_delay_total" should not add
> "task->delays->blkio_delay" since "task->delays->blkio_delay" is
> already the total delay time we want.
> 
> Am I missing anything?

Why are you sending this to me?  You have read
Documentation/SubmittingPatches, right?

Please use scripts/get_maintainers.pl for who to send patches to.

thanks,

greg k-h