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authorVincent Guittot <vincent.guittot@linaro.org>2014-04-11 11:44:40 +0200
committerIngo Molnar <mingo@kernel.org>2014-05-07 13:33:52 +0200
commitd77b3ed5c9f8ebedf154b52b5e943c461f3d37e6 (patch)
tree65de32de218284304e0e8f2c5456bf2c4a521809 /kernel/sched
parentsched, powerpc: Create a dedicated topology table (diff)
downloadlinux-d77b3ed5c9f8ebedf154b52b5e943c461f3d37e6.tar.xz
linux-d77b3ed5c9f8ebedf154b52b5e943c461f3d37e6.zip
sched: Add a new SD_SHARE_POWERDOMAIN for sched_domain
A new flag SD_SHARE_POWERDOMAIN is created to reflect whether groups of CPUs in a sched_domain level can or not reach different power state. As an example, the flag should be cleared at CPU level if groups of cores can be power gated independently. This information can be used in the load balance decision or to add load balancing level between group of CPUs that can power gate independantly. This flag is part of the topology flags that can be set by arch. Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: tony.luck@intel.com Cc: fenghua.yu@intel.com Cc: schwidefsky@de.ibm.com Cc: cmetcalf@tilera.com Cc: benh@kernel.crashing.org Cc: preeti@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1397209481-28542-5-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7e348e238bf1..1c9c3b7b26af 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5261,7 +5261,8 @@ static int sd_degenerate(struct sched_domain *sd)
SD_BALANCE_FORK |
SD_BALANCE_EXEC |
SD_SHARE_CPUPOWER |
- SD_SHARE_PKG_RESOURCES)) {
+ SD_SHARE_PKG_RESOURCES |
+ SD_SHARE_POWERDOMAIN)) {
if (sd->groups != sd->groups->next)
return 0;
}
@@ -5292,7 +5293,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
SD_BALANCE_EXEC |
SD_SHARE_CPUPOWER |
SD_SHARE_PKG_RESOURCES |
- SD_PREFER_SIBLING);
+ SD_PREFER_SIBLING |
+ SD_SHARE_POWERDOMAIN);
if (nr_node_ids == 1)
pflags &= ~SD_SERIALIZE;
}
@@ -5901,6 +5903,7 @@ static int sched_domains_curr_level;
* SD_SHARE_CPUPOWER - describes SMT topologies
* SD_SHARE_PKG_RESOURCES - describes shared caches
* SD_NUMA - describes NUMA topologies
+ * SD_SHARE_POWERDOMAIN - describes shared power domain
*
* Odd one out:
* SD_ASYM_PACKING - describes SMT quirks
@@ -5909,7 +5912,8 @@ static int sched_domains_curr_level;
(SD_SHARE_CPUPOWER | \
SD_SHARE_PKG_RESOURCES | \
SD_NUMA | \
- SD_ASYM_PACKING)
+ SD_ASYM_PACKING | \
+ SD_SHARE_POWERDOMAIN)
static struct sched_domain *
sd_init(struct sched_domain_topology_level *tl, int cpu)