linux-kernel - Re: [PATCH v3 1/2] cgroup: Show # of subsystem CSSes in cgroup.stat

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Message-ID: <e5348a85-22eb-48a6-876d-3180de5c7171@redhat.com>
Date: Thu, 11 Jul 2024 14:51:38 -0400
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>
Cc: Johannes Weiner <hannes@...xchg.org>, Zefan Li <lizefan.x@...edance.com>,
 Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 Kamalesh Babulal <kamalesh.babulal@...cle.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>
Subject: Re: [PATCH v3 1/2] cgroup: Show # of subsystem CSSes in cgroup.stat


On 7/11/24 14:44, Tejun Heo wrote:
> Hello,
>
> On Thu, Jul 11, 2024 at 01:39:38PM -0400, Waiman Long wrote:
>> On 7/11/24 13:18, Tejun Heo wrote:
> ...
>> Currently, I use the for_each_css() macro for iteration. If you mean
>> displaying all the possible cgroup subsystems even if they are not enabled
>> for the current cgroup, I will have to manually do the iteration.
> Just wrapping it with for_each_subsys() should do, no? for_each_css() won't
> iterate anything if css doesn't exist for the cgroup.

OK, I wasn't sure if you were asking to list all the possible cgroup v2 
cgroup subsystems even if they weren't enabled in the current cgroup. 
Apparently, that is the case. I prefer it that way too.

Thanks,
Longman