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authorSiddha, Suresh B <suresh.b.siddha@intel.com>2006-03-27 01:15:22 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:44:43 -0800
commit1e9f28fa1eb9773bf65bae08288c6a0a38eef4a7 (patch)
treeccfa4927ebc7a8f663f9ac9e7789a713a33253ff /include/asm-x86_64/smp.h
parent77e4bfbcf071f795b54862455dce8902b3fc29c2 (diff)
[PATCH] sched: new sched domain for representing multi-core
Add a new sched domain for representing multi-core with shared caches between cores. Consider a dual package system, each package containing two cores and with last level cache shared between cores with in a package. If there are two runnable processes, with this appended patch those two processes will be scheduled on different packages. On such systems, with this patch we have observed 8% perf improvement with specJBB(2 warehouse) benchmark and 35% improvement with CFP2000 rate(with 2 users). This new domain will come into play only on multi-core systems with shared caches. On other systems, this sched domain will be removed by domain degeneration code. This new domain can be also used for implementing power savings policy (see OLS 2005 CMP kernel scheduler paper for more details.. I will post another patch for power savings policy soon) Most of the arch/* file changes are for cpu_coregroup_map() implementation. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/smp.h')
-rw-r--r--include/asm-x86_64/smp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86_64/smp.h b/include/asm-x86_64/smp.h
index 9ccbb2cfd5c..a4fdaeb5c39 100644
--- a/include/asm-x86_64/smp.h
+++ b/include/asm-x86_64/smp.h
@@ -56,6 +56,7 @@ extern cpumask_t cpu_sibling_map[NR_CPUS];
extern cpumask_t cpu_core_map[NR_CPUS];
extern u8 phys_proc_id[NR_CPUS];
extern u8 cpu_core_id[NR_CPUS];
+extern u8 cpu_llc_id[NR_CPUS];
#define SMP_TRAMPOLINE_BASE 0x6000