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authorSiddha, Suresh B <suresh.b.siddha@intel.com>2006-06-27 02:54:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:45 -0700
commit5c45bf279d378d436ce45825c0f136696c7b6109 (patch)
tree80e2fcf4866b84fccb787562e1a83b16f4bc8850 /include/asm-i386/topology.h
parent369381694ddcf03f1de403501c8b97099b5109ec (diff)
downloadop-kernel-dev-5c45bf279d378d436ce45825c0f136696c7b6109.zip
op-kernel-dev-5c45bf279d378d436ce45825c0f136696c7b6109.tar.gz
[PATCH] sched: mc/smt power savings sched policy
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>
Diffstat (limited to 'include/asm-i386/topology.h')
-rw-r--r--include/asm-i386/topology.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-i386/topology.h b/include/asm-i386/topology.h
index aa4185e..6adbd9b 100644
--- a/include/asm-i386/topology.h
+++ b/include/asm-i386/topology.h
@@ -112,4 +112,9 @@ extern unsigned long node_remap_size[];
extern cpumask_t cpu_coregroup_map(int cpu);
+#ifdef CONFIG_SMP
+#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
+#define smt_capable() (smp_num_siblings > 1)
+#endif
+
#endif /* _ASM_I386_TOPOLOGY_H */
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