linux-kernel - Re: [PATCH] perf: Better fit max unprivileged mlock pages for tools needs

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Date:	Fri, 25 Mar 2011 16:05:12 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Han Pingtian <phan@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>,
	Stable <stable@...nel.org>
Subject: Re: [PATCH] perf: Better fit max unprivileged mlock pages for
 tools needs

On Fri, 2011-03-25 at 15:50 +0100, Frederic Weisbecker wrote:
> 2011/3/25 Peter Zijlstra <a.p.zijlstra@...llo.nl>:
> > On Wed, 2011-03-23 at 19:29 +0100, Frederic Weisbecker wrote:
> >
> >> -int sysctl_perf_event_mlock __read_mostly = 512; /* 'free' kb per user */
> >> +/* Minimum for 128 pages + 1 for the user control page */
> >> +int sysctl_perf_event_mlock __read_mostly = 516; /* 'free' kb per user */
> >
> > This assumes PAGE_SIZE = 4k..
> 
> Yeah, should I rebase the value on top of PAGE_SIZE?

Possibly yeah, I guess that when the base page size if 64k you really
can't do anything about wasting the whole first page, comes with the
territory.

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