linux/arch
Zhang, Yanmin 69dcc99199 [PATCH] Export cpu topology in sysfs
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>
2006-02-03 08:32:09 -08:00
..
alpha [PATCH] alpha show_interrups() trashes argument 2006-02-01 08:53:21 -08:00
arm [ARM] 3289/1: Enable the LCD support for Integrator/CP 2006-01-28 20:54:50 +00:00
arm26 [PATCH] arm26: select BLK_DEV_FD only on A5K 2006-02-01 08:53:22 -08:00
cris [PATCH] cris: task_thread_info() 2006-01-12 09:08:58 -08:00
frv [PATCH] Handle TIF_RESTORE_SIGMASK for FRV 2006-01-18 19:20:29 -08:00
h8300 [PATCH] h8300: task_stack_page() 2006-01-12 09:08:55 -08:00
i386 [PATCH] OProfile: fixed x86_64 incorrect kernel call graphs 2006-02-03 08:32:04 -08:00
ia64 [PATCH] Export cpu topology in sysfs 2006-02-03 08:32:09 -08:00
m32r [PATCH] m32r: task_pt_regs(), task_stack_page(), task_thread_info() 2006-01-12 09:08:54 -08:00
m68k [PATCH] m68k: console code in head.S needs framebuffer support built in 2006-01-12 09:09:06 -08:00
m68knommu [PATCH] m68knommu: task_stack_page() 2006-01-12 09:08:55 -08:00
mips [PATCH] mips: gdb-stub.c: fix parse error before ; token 2006-02-01 08:53:12 -08:00
parisc [PATCH] e1000: Added disable packet split capability 2006-01-18 16:17:57 -05:00
powerpc [PATCH] PowerPC/PCI Hotplug build break 2006-02-01 16:35:29 -08:00
ppc [PATCH] mv643xx_eth: Fix for building as a module 2006-01-27 11:09:24 -05:00
s390 [PATCH] s390: fix compat syscall wrapper 2006-02-03 08:32:01 -08:00
sh [PATCH] sh: machine_halt()/machine_power_off() cleanups 2006-02-01 08:53:20 -08:00
sh64 [PATCH] arch/sh64/kernel/time.c: add module.h 2006-02-01 08:53:20 -08:00
sparc [SPARC]: Fix compile failures in math-emu. 2006-01-30 16:46:24 -08:00
sparc64 [SPARC64]: Kill compat_sys_clock_settime sign extension stub. 2006-01-30 01:31:09 -08:00
um [PATCH] uml: avoid "CONFIG_NR_CPUS undeclared" bogus error messages 2006-02-01 08:53:23 -08:00
v850 [PATCH] Fix some ucLinux breakage from the tty updates 2006-02-03 08:32:04 -08:00
x86_64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2006-02-01 22:06:15 -08:00
xtensa [PATCH] Fix some ucLinux breakage from the tty updates 2006-02-03 08:32:04 -08:00