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sched: Add SD_PREFER_SIBLING

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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>
This commit is contained in:
Peter Zijlstra
2009-09-01 10:34:33 +02:00
committed by Ingo Molnar
parent f93e65c186
commit b5d978e0c7
2 changed files with 28 additions and 15 deletions
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14
kernel/sched.c
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@@ -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;