linux-kernel - [PATCHv2 1/2] sched: enable ARCH

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Date:	Tue, 26 Jan 2010 17:28:06 -0600
From:	Joel Schopp <jschopp@...tin.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	ego@...ibm.com, linuxppc-dev@...ts.ozlabs.org,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, jschopp@...tin.ibm.com
Subject: [PATCHv2 1/2] sched: enable ARCH_POWER

Enable the scheduler feature that allows use of arch_scale_smt_power.  Stub out
the broken x86 implementation.

Signed-off-by: Joel Schopp <jschopp@...tin.ibm.com>
---
Index: linux-2.6.git/kernel/sched_features.h
===================================================================
--- linux-2.6.git.orig/kernel/sched_features.h
+++ linux-2.6.git/kernel/sched_features.h
@@ -102,7 +102,7 @@ SCHED_FEAT(CACHE_HOT_BUDDY, 1)
 /*
  * Use arch dependent cpu power functions
  */
-SCHED_FEAT(ARCH_POWER, 0)
+SCHED_FEAT(ARCH_POWER, 1)
 
 SCHED_FEAT(HRTICK, 0)
 SCHED_FEAT(DOUBLE_TICK, 0)
Index: linux-2.6.git/arch/x86/kernel/cpu/sched.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/cpu/sched.c
+++ linux-2.6.git/arch/x86/kernel/cpu/sched.c
@@ -44,11 +44,9 @@ unsigned long arch_scale_freq_power(stru
 unsigned long arch_scale_smt_power(struct sched_domain *sd, int cpu)
 {
 	/*
-	 * aperf/mperf already includes the smt gain
+	 * aperf/mperf already includes the smt gain, but represents capacity
+	 * as 0 when idle.  So for now just return default.
 	 */
-	if (boot_cpu_has(X86_FEATURE_APERFMPERF))
-		return SCHED_LOAD_SCALE;
-
 	return default_scale_smt_power(sd, cpu);
 }
 



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