diff options
| author | Vincent Guittot <vincent.guittot@linaro.org> | 2012-10-06 11:43:26 +0200 |
|---|---|---|
| committer | Vincent Guittot <vincent.guittot@linaro.org> | 2013-05-16 18:45:04 +0200 |
| commit | d98d7e1c938940e100d63b630d2e5ca6bfa72371 (patch) | |
| tree | 13dbfc90f0ca583d4ff973ca1b2e3789054d228b | |
| parent | d0dbf95c919611f80e49a1152289ee07bb0b2a59 (diff) | |
sched: add a new SD_SHARE_POWERDOMAIN flag for sched_domain
This new flag SD_SHARE_POWERDOMAIN is used to reflect whether groups of CPUs
in a sched_domain level can or not reach a different power state. If groups of
cores can be power gated independently, as an example, the flag should be
cleared at CPU level. This information is used to decide if it's worth packing
some tasks in a group of CPUs in order to power gated the other groups instead
of spreading the tasks. The default behavior of the scheduler is to spread
tasks so the flag is set into all sched_domains.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Morten Rasmussen <morten.rasmussen@arm.com>
| -rw-r--r-- | arch/ia64/include/asm/topology.h | 1 | ||||
| -rw-r--r-- | arch/tile/include/asm/topology.h | 1 | ||||
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | include/linux/topology.h | 4 | ||||
| -rw-r--r-- | kernel/sched/core.c | 6 |
5 files changed, 13 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/topology.h b/arch/ia64/include/asm/topology.h index a2496e449b7..6d0b61741c1 100644 --- a/arch/ia64/include/asm/topology.h +++ b/arch/ia64/include/asm/topology.h @@ -65,6 +65,7 @@ void build_cpu_to_node_map(void); | SD_BALANCE_EXEC \ | SD_BALANCE_FORK \ | SD_WAKE_AFFINE, \ + | arch_sd_local_flags(0)\ .last_balance = jiffies, \ .balance_interval = 1, \ .nr_balance_failed = 0, \ diff --git a/arch/tile/include/asm/topology.h b/arch/tile/include/asm/topology.h index d5e86c9f74f..adc871020d4 100644 --- a/arch/tile/include/asm/topology.h +++ b/arch/tile/include/asm/topology.h @@ -71,6 +71,7 @@ static inline const struct cpumask *cpumask_of_node(int node) | 0*SD_WAKE_AFFINE \ | 0*SD_SHARE_CPUPOWER \ | 0*SD_SHARE_PKG_RESOURCES \ + | arch_sd_local_flags(0) \ | 0*SD_SERIALIZE \ , \ .last_balance = jiffies, \ diff --git a/include/linux/sched.h b/include/linux/sched.h index 8b2ee5ec528..4d33a7f9ffe 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -773,6 +773,7 @@ enum cpu_idle_type { #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ +#define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ diff --git a/include/linux/topology.h b/include/linux/topology.h index d3cf0d6e771..3eab2933c8e 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -99,6 +99,8 @@ int arch_update_cpu_topology(void); | 1*SD_WAKE_AFFINE \ | 1*SD_SHARE_CPUPOWER \ | 1*SD_SHARE_PKG_RESOURCES \ + | arch_sd_local_flags(SD_SHARE_CPUPOWER|\ + SD_SHARE_PKG_RESOURCES) \ | 0*SD_SERIALIZE \ | 0*SD_PREFER_SIBLING \ | arch_sd_sibling_asym_packing() \ @@ -131,6 +133,7 @@ int arch_update_cpu_topology(void); | 1*SD_WAKE_AFFINE \ | 0*SD_SHARE_CPUPOWER \ | 1*SD_SHARE_PKG_RESOURCES \ + | arch_sd_local_flags(SD_SHARE_PKG_RESOURCES)\ | 0*SD_SERIALIZE \ , \ .last_balance = jiffies, \ @@ -161,6 +164,7 @@ int arch_update_cpu_topology(void); | 1*SD_WAKE_AFFINE \ | 0*SD_SHARE_CPUPOWER \ | 0*SD_SHARE_PKG_RESOURCES \ + | arch_sd_local_flags(0) \ | 0*SD_SERIALIZE \ | 1*SD_PREFER_SIBLING \ , \ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index edbebf7784d..dc646dd1a08 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5961,6 +5961,11 @@ int __weak arch_sd_sibling_asym_packing(void) return 0*SD_ASYM_PACKING; } +int __weak arch_sd_local_flags(int level) +{ + return 1*SD_SHARE_POWERDOMAIN; +} + /* * Initializers for schedule domains * Non-inlined to reduce accumulated stack pressure in build_sched_domains() @@ -6150,6 +6155,7 @@ sd_numa_init(struct sched_domain_topology_level *tl, int cpu) | 0*SD_WAKE_AFFINE | 0*SD_SHARE_CPUPOWER | 0*SD_SHARE_PKG_RESOURCES + | 1*SD_SHARE_POWERDOMAIN | 1*SD_SERIALIZE | 0*SD_PREFER_SIBLING | sd_local_flags(level) |