[PATCH] sched: Print sched_group::__cpu_power in sched_domain_debug.

Gautham R Shenoy
2009-03-30T04:55:41Z

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>
---

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);