linux/arch/ia64
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
..
configs [PATCH] e1000: Added disable packet split capability 2006-01-18 16:17:57 -05:00
dig Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hp [PATCH] remove unused tmp_buf_sem's 2006-01-14 10:41:42 -08:00
ia32 [IA64] sem2mutex: arch/ia64/ia32/sys_ia32.c 2006-01-19 11:17:33 -08:00
kernel [PATCH] Export cpu topology in sysfs 2006-02-03 08:32:09 -08:00
lib Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2005-10-28 21:09:26 -07:00
mm [IA64] Simple memory hot-add for ia64. 2006-01-16 12:06:55 -08:00
oprofile [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
pci [ACPI] merge 3549 4320 4485 4588 4980 5483 5651 acpica asus fops pnpacpi branches into release 2006-01-24 17:52:48 -05:00
scripts Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sn [IA64-SGI] Add PROM feature set for device flush list 2006-01-26 13:50:40 -08:00
defconfig [PATCH] e1000: Added disable packet split capability 2006-01-18 16:17:57 -05:00
install.sh Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig [PATCH] Fix Kconfig of DMA32 for ia64 2005-12-12 08:57:45 -08:00
Kconfig.debug [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu 2005-11-07 07:53:35 -08:00
Makefile [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
module.lds Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00