linux-kernel - Re: [RFC 02/18] cgroup_pids: track maximum pids

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Message-ID: <20160719010931.GG3078@mtj.duckdns.org>
Date:	Mon, 18 Jul 2016 21:09:31 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Topi Miettinen <toiwoton@...il.com>
Cc:	linux-kernel@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>
Subject: Re: [RFC 02/18] cgroup_pids: track maximum pids

On Sun, Jul 17, 2016 at 08:11:31PM +0000, Topi Miettinen wrote:
> On 06/13/16 21:33, Tejun Heo wrote:
> > Hello,
> > 
> > On Mon, Jun 13, 2016 at 09:29:32PM +0000, Topi Miettinen wrote:
> >> I used fork callback as I don't want to lower the watermark in all cases
> >> where the charge can be lowered, so I'd update the watermark only when
> >> the fork really happens.
> > 
> > I don't think that would make a noticeable difference.  That's where
> > we decide whether to grant fork or not after all and thus where the
> > actual usage is.
> 
> I tried using only charge functions, but then the result was too low.
> With fork callback, the result was as expected.

Can you please elaborate in more details?

Thanks.

-- 
tejun