linux-kernel - Re: [RFC PATCH v3 2/9] cgroup/pids: Separate semantics of pids.events related to pids.max

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Date: Mon, 8 Apr 2024 07:55:38 -1000
From: Tejun Heo <tj@...nel.org>
To: Michal Koutný <mkoutny@...e.com>
Cc: cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Subject: Re: [RFC PATCH v3 2/9] cgroup/pids: Separate semantics of
 pids.events related to pids.max

Hello,

On Fri, Apr 05, 2024 at 07:05:41PM +0200, Michal Koutný wrote:
> Currently, when pids.max limit is breached in the hierarchy, the event
> is counted and reported in the cgroup where the forking task resides.
> 
> This decouples the limit and the notification caused by the limit making
> it hard to detect when the actual limit was effected.
> 
> Let's introduce new events:
> 	  max
> 		The number of times the limit of the cgroup was hit.
> 
> 	  max.imposed
> 		The number of times fork failed in the cgroup because of self
> 		or ancestor limit.

The whole series make sense to me. I'm not sure about max.imposed field
name. Maybe a name which clearly signfies rejection of forks would be
clearer? Johannes, what do you think?

Thanks.

-- 
tejun