From 1e9f28fa1eb9773bf65bae08288c6a0a38eef4a7 Mon Sep 17 00:00:00 2001 From: "Siddha, Suresh B" Date: Mon, 27 Mar 2006 01:15:22 -0800 Subject: [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 Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-i386/processor.h | 5 +++++ include/asm-i386/topology.h | 2 ++ include/asm-x86_64/processor.h | 4 ++++ include/asm-x86_64/smp.h | 1 + include/asm-x86_64/topology.h | 2 ++ include/linux/topology.h | 9 +++++++++ 6 files changed, 23 insertions(+) (limited to 'include') diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index feca5d961e2..af4bfd01247 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -20,6 +20,7 @@ #include #include #include +#include /* flag for disabling the tsc */ extern int tsc_disable; @@ -67,6 +68,9 @@ struct cpuinfo_x86 { char pad0; int x86_power; unsigned long loops_per_jiffy; +#ifdef CONFIG_SMP + cpumask_t llc_shared_map; /* cpus sharing the last level cache */ +#endif unsigned char x86_max_cores; /* cpuid returned max cores value */ unsigned char booted_cores; /* number of cores as seen by OS */ unsigned char apicid; @@ -103,6 +107,7 @@ extern struct cpuinfo_x86 cpu_data[]; extern int phys_proc_id[NR_CPUS]; extern int cpu_core_id[NR_CPUS]; +extern int cpu_llc_id[NR_CPUS]; extern char ignore_fpu_irq; extern void identify_cpu(struct cpuinfo_x86 *); diff --git a/include/asm-i386/topology.h b/include/asm-i386/topology.h index aa958c6ee83..b94e5eeef91 100644 --- a/include/asm-i386/topology.h +++ b/include/asm-i386/topology.h @@ -112,4 +112,6 @@ extern unsigned long node_remap_size[]; #endif /* CONFIG_NUMA */ +extern cpumask_t cpu_coregroup_map(int cpu); + #endif /* _ASM_I386_TOPOLOGY_H */ diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h index 8c8d88c036e..1aa2cee4334 100644 --- a/include/asm-x86_64/processor.h +++ b/include/asm-x86_64/processor.h @@ -20,6 +20,7 @@ #include #include #include +#include #define TF_MASK 0x00000100 #define IF_MASK 0x00000200 @@ -65,6 +66,9 @@ struct cpuinfo_x86 { __u32 x86_power; __u32 extended_cpuid_level; /* Max extended CPUID function supported */ unsigned long loops_per_jiffy; +#ifdef CONFIG_SMP + cpumask_t llc_shared_map; /* cpus sharing the last level cache */ +#endif __u8 apicid; __u8 booted_cores; /* number of cores as seen by OS */ } ____cacheline_aligned; 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 diff --git a/include/asm-x86_64/topology.h b/include/asm-x86_64/topology.h index c642f5d9882..9db54e9d17b 100644 --- a/include/asm-x86_64/topology.h +++ b/include/asm-x86_64/topology.h @@ -68,4 +68,6 @@ extern int __node_distance(int, int); #include +extern cpumask_t cpu_coregroup_map(int cpu); + #endif diff --git a/include/linux/topology.h b/include/linux/topology.h index e8eb0040ce3..a305ae2e44b 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -164,6 +164,15 @@ .nr_balance_failed = 0, \ } +#ifdef CONFIG_SCHED_MC +#ifndef SD_MC_INIT +/* for now its same as SD_CPU_INIT. + * TBD: Tune Domain parameters! + */ +#define SD_MC_INIT SD_CPU_INIT +#endif +#endif + #ifdef CONFIG_NUMA #ifndef SD_NODE_INIT #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! -- cgit v1.2.3