linux-kernel - [tip:sched/urgent] sched: Print sched_group::__cpu_power in sched_domain

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Date:	Wed, 1 Apr 2009 16:03:26 GMT
From:	Gautham R Shenoy <ego@...ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ego@...ibm.com, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Print sched_group::__cpu_power in sched_domain_debug

Commit-ID:  46e0bb9c12f4bab539736f1714cbf16600f681ec
Gitweb:     http://git.kernel.org/tip/46e0bb9c12f4bab539736f1714cbf16600f681ec
Author:     Gautham R Shenoy <ego@...ibm.com>
AuthorDate: Mon, 30 Mar 2009 10:25:20 +0530
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 1 Apr 2009 17:58:03 +0200

sched: Print sched_group::__cpu_power in sched_domain_debug

Impact: extend debug info /proc/sched_debug

If the user changes the value of the sched_mc/smt_power_savings sysfs
tunable, it'll trigger a rebuilding of the whole sched_domain tree,
with the SD_POWERSAVINGS_BALANCE flag set at certain levels.

As a result, there would be a change in the __cpu_power of sched_groups
in the sched_domain hierarchy.

Print the __cpu_power values for each sched_group in sched_domain_debug
to help verify this change and correlate it with the change in the
load-balancing behavior.

Signed-off-by: Gautham R Shenoy <ego@...ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20090330045520.2869.24777.stgit@...ia.in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 8d1bdbe..6234d10 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6963,7 +6963,8 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
 		cpumask_or(groupmask, groupmask, sched_group_cpus(group));
 
 		cpulist_scnprintf(str, sizeof(str), sched_group_cpus(group));
-		printk(KERN_CONT " %s", str);
+		printk(KERN_CONT " %s (__cpu_power = %d)", str,
+						group->__cpu_power);
 
 		group = group->next;
 	} while (group != sd->groups);
--
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