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

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Message-Id: <1301493870-4551-1-git-send-email-fweisbec@gmail.com>
Date:	Wed, 30 Mar 2011 16:04:30 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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: [PATCH] perf: Rebase max unprivileged mlock threshold on top of page size

So that we ensure we allow 129 pages, even if the page size is
different than 4096.

Reported-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Stable <stable@...nel.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
---
 kernel/perf_event.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index c75925c..fce1b8a 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -146,7 +146,7 @@ static struct srcu_struct pmus_srcu;
 int sysctl_perf_event_paranoid __read_mostly = 1;
 
 /* Minimum for 128 pages + 1 for the user control page */
-int sysctl_perf_event_mlock __read_mostly = 516; /* 'free' kb per user */
+int sysctl_perf_event_mlock __read_mostly = (129 * PAGE_SIZE) / 1024; /* 'free' kb per user */
 
 /*
  * max perf event sample rate
-- 
1.7.3.2

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