Messages in this thread Patch in this message | | | Date | Wed, 1 Apr 2009 16:03:26 GMT | From | Gautham R Shenoy <> | Subject | [tip:sched/urgent] sched: Print sched_group::__cpu_power in sched_domain_debug |
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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);
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