linux-kernel - [PATCH] sched: Print sched_group::__cpu_power in sched_domain

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Message-ID: <20090330045520.2869.24777.stgit@sofia.in.ibm.com>
Date:	Mon, 30 Mar 2009 10:25:20 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: [PATCH] sched: Print sched_group::__cpu_power in sched_domain_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>
---

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

diff --git a/kernel/sched.c b/kernel/sched.c
index 706517c..fbac83b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7363,7 +7363,8 @@ 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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