[tip:sched/urgent] sched: Print sched_group::__cpu_power in sched_domain_debug

Gautham R Shenoy
2009-04-01T16:04:40Z

Commit-ID: 46e0bb9c12f4bab539736f1714cbf16600f681ec
Gitweb: http://git.kernel.org/tip/46e0bb9c12f4bab539736f1714cbf16600f681ec
Author: Gautham R Shenoy <ego@in.ibm.com>
AuthorDate: Mon, 30 Mar 2009 10:25:20 +0530
Committer: Ingo Molnar <mingo@elte.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@in.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090330045520.2869.24777.stgit@sofia.in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.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);