linux-kernel - Re: [PATCH] perf: remove include of cgroup.h from perf

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Date:	Wed, 6 Mar 2013 12:20:41 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Li Zefan <lizefan@...wei.com>, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] perf: remove include of cgroup.h from perf_event.h

On Wed, Mar 6, 2013 at 11:31 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Stephane Eranian <eranian@...gle.com> wrote:
>
>> > - * This is a per-cpu dynamically allocated data structure.
>> > - */
>> > -struct perf_cgroup_info {
>> > -       u64                             time;
>> > -       u64                             timestamp;
>> > -};
>> > -
>> > -struct perf_cgroup {
>> > -       struct                          cgroup_subsys_state css;
>> > -       struct                          perf_cgroup_info *info; /* timing info, one per cpu */
>> > -};
>> > -#endif
>> > -
>> > +struct perf_cgroup;
>>
>> The problem is that you have struct perf_cgroup in the struct perf_event
>> structure. Today, this field is not referenced outside of kernel/events/core.c But
>> it is available outside this file. If someday the field is reference, your changes
>> will have to do reverted. So I am wondering what is the point of the change right
>> now?
>
> It's standard practice to not define the type for task_struct or other kernel
> subsystems.
>
> For example slab caches can be created via kmem_cache_create() anywhere in the tree,
> but the internal structure is only known to the SLAB subsystem.
>
I am fine with the change.
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