mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 01:51:53 +00:00
5c45bf279d
sysfs entries 'sched_mc_power_savings' and 'sched_smt_power_savings' in /sys/devices/system/cpu/ control the MC/SMT power savings policy for the scheduler. Based on the values (1-enable, 0-disable) for these controls, sched groups cpu power will be determined for different domains. When power savings policy is enabled and under light load conditions, scheduler will minimize the physical packages/cpu cores carrying the load and thus conserving power(with a perf impact based on the workload characteristics... see OLS 2005 CMP kernel scheduler paper for more details..) Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Con Kolivas <kernel@kolivas.org> Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#ifndef _ASM_X86_64_TOPOLOGY_H
|
|
#define _ASM_X86_64_TOPOLOGY_H
|
|
|
|
|
|
#ifdef CONFIG_NUMA
|
|
|
|
#include <asm/mpspec.h>
|
|
#include <asm/bitops.h>
|
|
|
|
extern cpumask_t cpu_online_map;
|
|
|
|
extern unsigned char cpu_to_node[];
|
|
extern cpumask_t node_to_cpumask[];
|
|
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
extern int __node_distance(int, int);
|
|
#define node_distance(a,b) __node_distance(a,b)
|
|
/* #else fallback version */
|
|
#endif
|
|
|
|
#define cpu_to_node(cpu) (cpu_to_node[cpu])
|
|
#define parent_node(node) (node)
|
|
#define node_to_first_cpu(node) (first_cpu(node_to_cpumask[node]))
|
|
#define node_to_cpumask(node) (node_to_cpumask[node])
|
|
#define pcibus_to_node(bus) ((long)(bus->sysdata))
|
|
#define pcibus_to_cpumask(bus) node_to_cpumask(pcibus_to_node(bus));
|
|
|
|
#define numa_node_id() read_pda(nodenumber)
|
|
|
|
/* sched_domains SD_NODE_INIT for x86_64 machines */
|
|
#define SD_NODE_INIT (struct sched_domain) { \
|
|
.span = CPU_MASK_NONE, \
|
|
.parent = NULL, \
|
|
.groups = NULL, \
|
|
.min_interval = 8, \
|
|
.max_interval = 32, \
|
|
.busy_factor = 32, \
|
|
.imbalance_pct = 125, \
|
|
.cache_nice_tries = 2, \
|
|
.busy_idx = 3, \
|
|
.idle_idx = 2, \
|
|
.newidle_idx = 0, \
|
|
.wake_idx = 1, \
|
|
.forkexec_idx = 1, \
|
|
.per_cpu_gain = 100, \
|
|
.flags = SD_LOAD_BALANCE \
|
|
| SD_BALANCE_FORK \
|
|
| SD_BALANCE_EXEC \
|
|
| SD_WAKE_BALANCE, \
|
|
.last_balance = jiffies, \
|
|
.balance_interval = 1, \
|
|
.nr_balance_failed = 0, \
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define topology_physical_package_id(cpu) (cpu_data[cpu].phys_proc_id)
|
|
#define topology_core_id(cpu) (cpu_data[cpu].cpu_core_id)
|
|
#define topology_core_siblings(cpu) (cpu_core_map[cpu])
|
|
#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
|
|
#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
|
|
#define smt_capable() (smp_num_siblings > 1)
|
|
#endif
|
|
|
|
#include <asm-generic/topology.h>
|
|
|
|
extern cpumask_t cpu_coregroup_map(int cpu);
|
|
|
|
#endif
|