This is a note to let you know that I've just added the patch titled
perf: Rebase max unprivileged mlock threshold on top of page size
to the 2.6.38-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-rebase-max-unprivileged-mlock-threshold-on-top-of-page-size.patch
and it can be found in the queue-2.6.38 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 20443384fe090c5f8aeb016e7e85659c5bbdd69f Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <[email protected]>
Date: Thu, 31 Mar 2011 03:33:29 +0200
Subject: perf: Rebase max unprivileged mlock threshold on top of page size
From: Frederic Weisbecker <[email protected]>
commit 20443384fe090c5f8aeb016e7e85659c5bbdd69f upstream.
Ensure we allow 512 kiB + 1 page for user control without
assuming a 4096 bytes page size.
Reported-by: Peter Zijlstra <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Stephane Eranian <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/perf_event.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -62,8 +62,8 @@ 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 */
+/* Minimum for 512 kiB + 1 user control page */
+int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /*
'free' kiB per user */
/*
* max perf event sample rate
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.38/perf-better-fit-max-unprivileged-mlock-pages-for-tools-needs.patch
queue-2.6.38/perf-rebase-max-unprivileged-mlock-threshold-on-top-of-page-size.patch
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