linux-kernel - Re: [PATCH v4] cgroup: Add pids controller event when fork fails because of pid limit

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Message-ID: <20160621180629.GN3262@mtj.duckdns.org>
Date:	Tue, 21 Jun 2016 14:06:29 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Kenny Yu <kennyyu@...com>
Cc:	lizefan@...wei.com, hannes@...xchg.org, cyphar@...har.com,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH v4] cgroup: Add pids controller event when fork fails
 because of pid limit

On Tue, Jun 21, 2016 at 10:44:50AM -0700, Kenny Yu wrote:
> This patch adds more visibility into the pids controller when the controller
> rejects a fork request. Whenever fork fails because the limit on the number of
> pids in the cgroup is reached, the controller will log this and also notify the
> newly added cgroups events file. The `max` key in the events file represents
> the number of times fork failed because of the pids controller.
> 
> This change also logs only the first time the `max` event counter is
> incremented. This is to provide a hint to the user to understand why fork
> failed, as users are not yet used to seeing fork failures because of the
> pids controller.
> 
> Signed-off-by: Kenny Yu <kennyyu@...com>
> Acked-by: Johannes Weiner <hannes <at> cmpxchg.org>

Applied to cgroup/for-4.8.  Thanks!

-- 
tejun