diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-01 10:34:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-04 10:09:53 +0200 |
| commit | b5d978e0c7e79a7ff842e895c85a86b38c71f1cd (patch) | |
| tree | 83502797f31953c66a76ab9cd43d6df999084210 /kernel/sched.c | |
| parent | f93e65c186ab3c05ce2068733ca10e34fd00125e (diff) | |
sched: Add SD_PREFER_SIBLING
Do the placement thing using SD flags.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Gautham R Shenoy <ego@in.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
LKML-Reference: <20090901083825.897028974@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 584a122b553..9d64cec9ae1 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3811,9 +3811,13 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu, const struct cpumask *cpus, int *balance, struct sd_lb_stats *sds) { + struct sched_domain *child = sd->child; struct sched_group *group = sd->groups; struct sg_lb_stats sgs; - int load_idx; + int load_idx, prefer_sibling = 0; + + if (child && child->flags & SD_PREFER_SIBLING) + prefer_sibling = 1; init_sd_power_savings_stats(sd, sds, idle); load_idx = get_sd_load_idx(sd, idle); @@ -3833,6 +3837,14 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu, sds->total_load += sgs.group_load; sds->total_pwr += group->__cpu_power; + /* + * In case the child domain prefers tasks go to siblings + * first, lower the group capacity to one so that we'll try + * and move all the excess tasks away. + */ + if (prefer_sibling) + sgs.group_capacity = 1; + if (local_group) { sds->this_load = sgs.avg_load; sds->this = group; |