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The patch implements cpu topology exportation by sysfs. Items (attributes) are similar to /proc/cpuinfo. 1) /sys/devices/system/cpu/cpuX/topology/physical_package_id: represent the physical package id of cpu X; 2) /sys/devices/system/cpu/cpuX/topology/core_id: represent the cpu core id to cpu X; 3) /sys/devices/system/cpu/cpuX/topology/thread_siblings: represent the thread siblings to cpu X in the same core; 4) /sys/devices/system/cpu/cpuX/topology/core_siblings: represent the thread siblings to cpu X in the same physical package; To implement it in an architecture-neutral way, a new source file, driver/base/topology.c, is to export the 5 attributes. If one architecture wants to support this feature, it just needs to implement 4 defines, typically in file include/asm-XXX/topology.h. The 4 defines are: #define topology_physical_package_id(cpu) #define topology_core_id(cpu) #define topology_thread_siblings(cpu) #define topology_core_siblings(cpu) The type of **_id is int. The type of siblings is cpumask_t. To be consistent on all architectures, the 4 attributes should have deafult values if their values are unavailable. Below is the rule. 1) physical_package_id: If cpu has no physical package id, -1 is the default value. 2) core_id: If cpu doesn't support multi-core, its core id is 0. 3) thread_siblings: Just include itself, if the cpu doesn't support HT/multi-thread. 4) core_siblings: Just include itself, if the cpu doesn't support multi-core and HT/Multi-thread. So be careful when declaring the 4 defines in include/asm-XXX/topology.h. If an attribute isn't defined on an architecture, it won't be exported. Thank Nathan, Greg, Andi, Paul and Venki. The patch provides defines for i386/x86_64/ia64. Signed-off-by: Zhang, Yanmin <yanmin.zhang@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef _ASM_X86_64_TOPOLOGY_H
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#define _ASM_X86_64_TOPOLOGY_H
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#include <linux/config.h>
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#ifdef CONFIG_NUMA
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#include <asm/mpspec.h>
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#include <asm/bitops.h>
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/* Map the K8 CPU local memory controllers to a simple 1:1 CPU:NODE topology */
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extern cpumask_t cpu_online_map;
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extern unsigned char cpu_to_node[];
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extern cpumask_t node_to_cpumask[];
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#ifdef CONFIG_ACPI_NUMA
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extern int __node_distance(int, int);
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#define node_distance(a,b) __node_distance(a,b)
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/* #else fallback version */
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#endif
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#define cpu_to_node(cpu) (cpu_to_node[cpu])
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#define parent_node(node) (node)
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#define node_to_first_cpu(node) (first_cpu(node_to_cpumask[node]))
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#define node_to_cpumask(node) (node_to_cpumask[node])
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#define pcibus_to_node(bus) ((long)(bus->sysdata))
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#define pcibus_to_cpumask(bus) node_to_cpumask(pcibus_to_node(bus));
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#define numa_node_id() read_pda(nodenumber)
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/* sched_domains SD_NODE_INIT for x86_64 machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.span = CPU_MASK_NONE, \
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.parent = NULL, \
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.groups = NULL, \
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.min_interval = 8, \
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.max_interval = 32, \
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.busy_factor = 32, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 2, \
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.busy_idx = 3, \
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.idle_idx = 2, \
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.newidle_idx = 0, \
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.wake_idx = 1, \
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.forkexec_idx = 1, \
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.per_cpu_gain = 100, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_FORK \
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| SD_BALANCE_EXEC \
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| SD_WAKE_BALANCE, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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.nr_balance_failed = 0, \
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}
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#endif
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#ifdef CONFIG_SMP
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#define topology_physical_package_id(cpu) \
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(phys_proc_id[cpu] == BAD_APICID ? -1 : phys_proc_id[cpu])
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#define topology_core_id(cpu) \
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(cpu_core_id[cpu] == BAD_APICID ? 0 : cpu_core_id[cpu])
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#define topology_core_siblings(cpu) (cpu_core_map[cpu])
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#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
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#endif
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#include <asm-generic/topology.h>
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#endif
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