linux-kernel - Re: [PATCH V3 09/12] block: always attach cgroup info into bio

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Message-ID: <20170619190943.GL12062@htj.duckdns.org>
Date:   Mon, 19 Jun 2017 15:09:43 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        gregkh@...uxfoundation.org, hch@....de, axboe@...com,
        rostedt@...dmis.org, lizefan@...wei.com, Kernel-team@...com,
        Shaohua Li <shli@...com>
Subject: Re: [PATCH V3 09/12] block: always attach cgroup info into bio

On Thu, Jun 15, 2017 at 11:17:17AM -0700, Shaohua Li wrote:
> From: Shaohua Li <shli@...com>
> 
> blkcg_bio_issue_check() already gets blkcg for a BIO.
> bio_associate_blkcg() uses a percpu refcounter, so it's a very cheap
> operation. There is no point we don't attach the cgroup info into bio at
> blkcg_bio_issue_check. This also makes blktrace outputs correct cgroup
> info.
> 
> Signed-off-by: Shaohua Li <shli@...com>

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

Thanks.

-- 
tejun