linux-kernel - Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete

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Message-ID: <CANejiEWa5um5LtRkL3NcbNgBnUCG1Ud8qw-hfXW3X3GPfHv4iQ@mail.gmail.com>
Date:	Thu, 15 Sep 2011 09:05:23 +0800
From:	Shaohua Li <shli@...nel.org>
To:	Tao Ma <tm@....ma>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete_request.

2011/9/14 Tao Ma <tm@....ma>:
> From: Tao Ma <boyu.mt@...bao.com>
>
> In __blk_complete_request, we check both QUEUE_FLAG_SAME_COMP and req->cpu
> to decide whether we should use req->cpu. Actually the user can also
> select the complete cpu by either setting BIO_CPU_AFFINE or by calling
> bio_set_completion_cpu. Current solution makes these 2 ways don't work
> any more. So we'd better just check req->cpu.
>
> Cc: Jens Axboe <jaxboe@...ionio.com>
> Signed-off-by: Tao Ma <boyu.mt@...bao.com>
> ---
>  block/blk-softirq.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/block/blk-softirq.c b/block/blk-softirq.c
> index 58340d0..1366a89 100644
> --- a/block/blk-softirq.c
> +++ b/block/blk-softirq.c
> @@ -115,7 +115,7 @@ void __blk_complete_request(struct request *req)
>        /*
>         * Select completion CPU
>         */
> -       if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) && req->cpu != -1) {
> +       if (req->cpu != -1) {
>                ccpu = req->cpu;
>                if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags)) {
>                        ccpu = blk_cpu_to_group(ccpu);
why not delete bio_set_completion_cpu()?
1. nobody uses it in my search
2. it's misleading. even setting the completion cpu, the bio isn't
always to run finish in the cpu,
it's just run in the group of the cpu.

Thanks,
Shaohua
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