linux-kernel - [PATCH] [2/4] SCHED: Mark all frequently used sysctls __read

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Message-Id: <20081112124510.652EB3E6611@basil.firstfloor.org>
Date:	Wed, 12 Nov 2008 13:45:10 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	mingo@...e.hu, linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH] [2/4] SCHED: Mark all frequently used sysctls __read_mostly


There are more optimizations possible here, but that's for another
patch.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 kernel/sched.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Index: linux-2.6.28-rc4-test/kernel/sched.c
===================================================================
--- linux-2.6.28-rc4-test.orig/kernel/sched.c	2008-11-12 12:32:52.000000000 +0100
+++ linux-2.6.28-rc4-test/kernel/sched.c	2008-11-12 12:52:52.000000000 +0100
@@ -686,7 +686,7 @@
 #define SCHED_FEAT(name, enabled)	\
 	(1UL << __SCHED_FEAT_##name) * enabled |
 
-const_debug unsigned int sysctl_sched_features =
+const_debug unsigned int sysctl_sched_features __read_mostly =
 #include "sched_features.h"
 	0;
 
@@ -809,26 +809,26 @@
  * Number of tasks to iterate in a single balance run.
  * Limited because this is done with IRQs disabled.
  */
-const_debug unsigned int sysctl_sched_nr_migrate = 32;
+const_debug unsigned int sysctl_sched_nr_migrate __read_mostly = 32;
 
 /*
  * ratelimit for updating the group shares.
  * default: 0.25ms
  */
-unsigned int sysctl_sched_shares_ratelimit = 250000;
+unsigned int sysctl_sched_shares_ratelimit __read_mostly = 250000;
 
 /*
  * Inject some fuzzyness into changing the per-cpu group shares
  * this avoids remote rq-locks at the expense of fairness.
  * default: 4
  */
-unsigned int sysctl_sched_shares_thresh = 4;
+unsigned int sysctl_sched_shares_thresh __read_mostly = 4;
 
 /*
  * period over which we measure -rt task cpu usage in us.
  * default: 1s
  */
-unsigned int sysctl_sched_rt_period = 1000000;
+unsigned int sysctl_sched_rt_period __read_mostly = 1000000;
 
 static __read_mostly int scheduler_running;
 
--
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