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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-09-01 10:34:33 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-04 10:09:53 +0200
commitb5d978e0c7e79a7ff842e895c85a86b38c71f1cd (patch)
tree83502797f31953c66a76ab9cd43d6df999084210 /kernel/sched.c
parentf93e65c186ab3c05ce2068733ca10e34fd00125e (diff)
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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.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 584a122..9d64cec 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;