linux-kernel - Re: [PATCH 2/5] sched: always use blk_schedule_flush_plug in io_schedule

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Message-ID: <x49h9rwytqy.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 01 May 2015 15:37:09 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Shaohua Li <shli@...com>
Cc:	<linux-kernel@...r.kernel.org>, <axboe@...com>, <hch@....de>,
	<neilb@...e.de>
Subject: Re: [PATCH 2/5] sched: always use blk_schedule_flush_plug in io_schedule_out

Shaohua Li <shli@...com> writes:

> V2: don't change ->in_iowait
>
> Cc: NeilBrown <neilb@...e.de>
> Signed-off-by: Shaohua Li <shli@...com>
> ---
>  kernel/sched/core.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index f9123a8..1ab3d2d 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4402,10 +4402,7 @@ long __sched io_schedule_timeout(long timeout)
>  	long ret;
>  
>  	current->in_iowait = 1;
> -	if (old_iowait)
> -		blk_schedule_flush_plug(current);
> -	else
> -		blk_flush_plug(current);
> +	blk_schedule_flush_plug(current);
>  
>  	delayacct_blkio_start();
>  	rq = raw_rq();

Looks good to me.

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
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