linux-kernel - Re: [PATCH v2] cgroup: move cgroup_subsys_state parent field for cache locality

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Date:   Tue, 11 Apr 2017 09:05:23 +0900
From:   Tejun Heo <tj@...nel.org>
To:     Todd Poynor <toddpoynor@...il.com>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Todd Poynor <toddpoynor@...gle.com>
Subject: Re: [PATCH v2] cgroup: move cgroup_subsys_state parent field for
 cache locality

Hello,

On Thu, Apr 06, 2017 at 06:47:57PM -0700, Todd Poynor wrote:
> From: Todd Poynor <toddpoynor@...gle.com>
> 
> Various structures embed a struct cgroup_subsys_state, typically at
> the top of the containing structure.  It is common for code that
> accesses the structures to perform operations that iterate over the
> chain of parent css pointers, also accessing data in each containing
> structure.  In particular, struct cpuacct is used by fairly hot code
> paths in the scheduler such as cpuacct_charge().
> 
> Move the parent css pointer field to the end of the structure to
> increase the chances of residing in the same cache line as the data
> from the containing structure.
> 
> Signed-off-by: Todd Poynor <toddpoynor@...gle.com>

Applied to cgroup/for-4.12.

Thanks.

-- 
tejun