linux-kernel - Re: [rfc patch] sched/topology: fix domain reconstruction memory leakage

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Date:   Mon, 21 Aug 2017 13:45:10 +0200
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [rfc patch] sched/topology: fix domain reconstruction memory
 leakage

On Mon, 2017-08-21 at 10:16 +0200, Peter Zijlstra wrote:
> On Sat, Aug 19, 2017 at 08:10:49AM +0200, Mike Galbraith wrote:
> > Greetings,
> > 
> > While beating on cpu hotplug with the shiny new topology fixes
> > backported, my memory poor 8 socket box fairly quickly leaked itself to
> > death, 0c0e776a9b0f being the culprit.  With the below applied, box
> > took a severe beating overnight without a whimper.
> > 
> > I'm wondering (ergo rfc) if free_sched_groups() shouldn't be renamed to
> > put_sched_groups() instead, with overlapping domains taking a group
> > reference reference as well so they can put both sg/sgc rather than put
> > one free the other.  Those places that want an explicit free can pass
> > free to only explicitly free sg (or use two functions).  Minimalist
> > approach works (minus signs, yay), but could perhaps use some "pretty".
> > 
> > sched/topology: fix domain reconstruction memory leakage
> 
> I was sitting on this one:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=sched/core&id=c63d18dd6ea59eec5cba857835f788943ff9f0d5
> 
> is that the same?

If that doesn't muck up the other places that were doing explicit sd
free without putting sgc, cool (I still like rename.. but then me and
pretty don't seem to get along all that well, so whatever works;).

	-Mike