linux-kernel - Re: [PATCH] perf: Rebase max unprivileged mlock threshold on top of page size

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Date:	Wed, 30 Mar 2011 16:53:28 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Stable <stable@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf: Rebase max unprivileged mlock threshold on top
 of page size

On Wed, Mar 30, 2011 at 04:40:28PM +0200, Peter Zijlstra wrote:
> On Wed, 2011-03-30 at 16:04 +0200, Frederic Weisbecker wrote:
> > +int sysctl_perf_event_mlock __read_mostly = (129 * PAGE_SIZE) / 1024; /* 'free' kb per user */
> 
> I'm fairly sure you don't want to do this either: 
>   512 + (PAGE_SIZE / 1024)
> should do I think, there's no reason to further inflate things for large
> page platforms.

Right, that also requires to fix tools that use a default number of pages instead
of computing nr_pages on top of page size and a default kb size.

Will respin by fixing both sides.

Thanks.
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