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| author | Siddha, Suresh B <suresh.b.siddha@intel.com> | 2006-06-27 02:54:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-27 17:32:45 -0700 |
| commit | 5c45bf279d378d436ce45825c0f136696c7b6109 (patch) | |
| tree | 80e2fcf4866b84fccb787562e1a83b16f4bc8850 /include/asm-x86_64 | |
| parent | 369381694ddcf03f1de403501c8b97099b5109ec (diff) | |
| download | blackbird-op-linux-5c45bf279d378d436ce45825c0f136696c7b6109.tar.gz blackbird-op-linux-5c45bf279d378d436ce45825c0f136696c7b6109.zip | |
[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-x86_64')
| -rw-r--r-- | include/asm-x86_64/topology.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86_64/topology.h b/include/asm-x86_64/topology.h index c4e46e7fa7ba..6e7a2e976b04 100644 --- a/include/asm-x86_64/topology.h +++ b/include/asm-x86_64/topology.h @@ -59,6 +59,8 @@ extern int __node_distance(int, int); #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> |
