linux-kernel - Re: [PATCH 12/23] cgroup: pass around cgroup_subsys

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Date:	Mon, 5 Aug 2013 10:19:55 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	Aristeu Rozanski <aris@...hat.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	Jens Axboe <axboe@...nel.dk>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 12/23] cgroup: pass around cgroup_subsys_state instead of
 cgroup in file methods

On Thu, Aug 01, 2013 at 05:49:50PM -0400, Tejun Heo wrote:
> cgroup is currently in the process of transitioning to using struct
> cgroup_subsys_state * as the primary handle instead of struct cgroup.
> Please see the previous commit which converts the subsystem methods
> for rationale.
> 
> This patch converts all cftype file operations to take @css instead of
> @cgroup.  cftypes for the cgroup core files don't have their subsytem
> pointer set.  These will automatically use the dummy_css added by the
> previous patch and can be converted the same way.
> 
> Most subsystem conversions are straight forwards but there are some
> interesting ones.
> 
> * freezer: update_if_frozen() is also converted to take @css instead
>   of @cgroup for consistency.  This will make the code look simpler
>   too once iterators are converted to use css.
> 
> * memory/vmpressure: mem_cgroup_from_css() needs to be exported to
>   vmpressure while mem_cgroup_from_cont() can be made static.
>   Updated accordingly.
> 
> * cpu: cgroup_tg() doesn't have any user left.  Removed.
> 
> * cpuacct: cgroup_ca() doesn't have any user left.  Removed.
> 
> * hugetlb: hugetlb_cgroup_form_cgroup() doesn't have any user left.
>   Removed.
> 
> * net_cls: cgrp_cls_state() doesn't have any user left.  Removed.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Li Zefan <lizefan@...wei.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Balbir Singh <bsingharora@...il.com>
> Cc: Aristeu Rozanski <aris@...hat.com>
> Cc: Matt Helsley <matthltc@...ibm.com>
> Cc: Daniel Wagner <daniel.wagner@...-carit.de>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> ---
>  block/blk-cgroup.c         |   6 +-
>  block/blk-throttle.c       |  32 ++++-----
>  block/cfq-iosched.c        |  90 ++++++++++++-------------

blk-cgroup.c, blk-throttle.c and cfq-iosched.c bits look good to me.

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek
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