linux-kernel - Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

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Date:	Sat, 06 Sep 2014 01:32:04 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Tejun Heo <tj@...nel.org>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch v4 1/2] freezer: check OOM kill while being frozen

On Saturday, September 06, 2014 07:45:54 AM Tejun Heo wrote:
> Hello,
> 
> On Fri, Sep 05, 2014 at 11:12:24AM -0700, Cong Wang wrote:
> > > Rafael, can you please help?
> > 
> > Rafael is known not responsive at least for this topic. :)
> 
> :(

Well, am I?

I haven't commented patches in this thread so far, mostly because other
people have.

How can I help actually?

> > > Shouldn't the primary goal of the comment be explaining why we need
> > > TIF_MEMDIE check there at all anyway?  The deadlock possiblity is not
> > > very obvious.
> > 
> > The changelog is not long enough?? ;-) I hate to copy+paste changelog
> > into comments, changelog is essentially necessary for people to understand
> > kernel code (at least networking) , so I don't think we have to move it
> > into comments in this case.
> 
> It doesn't have to be the same text but the current comment is
> basically content-less.  e.g. it can just say "OOM killer may get
> stuck trying to kill a cgroup frozen task" and actualy provide
> information on what condition the conditional tries to address.

Or something like "We need to check X to prevent Y from happening".

Rafael

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