linux-kernel - Re: [PATCH v12 4/8] cgroup, block: implement task_get_css() and use it in bio_associate

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Message-ID: <20150518215907.GJ24861@htj.duckdns.org>
Date:	Mon, 18 May 2015 17:59:07 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Aleksa Sarai <cyphar@...har.com>
Cc:	lizefan@...wei.com, mingo@...hat.com, peterz@...radead.org,
	richard@....at, fweisbec@...il.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v12 4/8] cgroup, block: implement task_get_css() and use
 it in bio_associate_current()

On Tue, May 19, 2015 at 12:51:03AM +1000, Aleksa Sarai wrote:
> From: Tejun Heo <tj@...nel.org>
> 
> bio_associate_current() currently open codes task_css() and
> css_tryget_online() to find and pin $current's blkcg css.  Abstract it
> into task_get_css() which is implemented from cgroup side.  As a task
> is always associated with an online css for every subsystem except
> while the css_set update is propagating, task_get_css() retries till
> css_tryget_online() succeeds.
> 
> This is a cleanup and shouldn't lead to noticeable behavior changes.

Applied 1-4 but skipped bio_associate_current() changes from this
patch.  I'll route that part through a different patchset.

Thanks.

-- 
tejun
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