kernel_optimize_test/arch
Andi Kleen 3cfc348bf9 [PATCH] x86: Add portable getcpu call
For NUMA optimization and some other algorithms it is useful to have a fast
to get the current CPU and node numbers in user space.

x86-64 added a fast way to do this in a vsyscall. This adds a generic
syscall for other architectures to make it a generic portable facility.

I expect some of them will also implement it as a faster vsyscall.

The cache is an optimization for the x86-64 vsyscall optimization. Since
what the syscall returns is an approximation anyways and user space
often wants very fast results it can be cached for some time.  The norma
methods to get this information in user space are relatively slow

The vsyscall is in a better position to manage the cache because it has direct
access to a fast time stamp (jiffies). For the generic syscall optimization
it doesn't help much, but enforce a valid argument to keep programs
portable

I only added an i386 syscall entry for now. Other architectures can follow
as needed.

AK: Also added some cleanups from Andrew Morton

Signed-off-by: Andi Kleen <ak@suse.de>
2006-09-26 10:52:28 +02:00
..
alpha [PATCH] arch/alpha: Use ARRAY_SIZE macro 2006-07-31 13:28:38 -07:00
arm [ARM] 3794/1: S3C24XX: do not defined set_irq_wake when no CONFIG_PM 2006-09-18 13:30:20 +01:00
arm26 [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
cris [PATCH] pcf8563: remove MOD_INC_USE_COUNT, MOD_DEC_USE_COUNT 2006-07-10 13:24:22 -07:00
frv [PATCH] sanitize frv archclean 2006-09-22 17:48:56 -07:00
h8300 [PATCH] irq-flags: H8300: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
i386 [PATCH] x86: Add portable getcpu call 2006-09-26 10:52:28 +02:00
ia64 [PATCH] cpu to node relationship fixup: map cpu to node 2006-09-25 17:38:36 -07:00
m32r [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
m68k [PATCH] irq-flags: M68K: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
m68knommu [PATCH] irq-flags: M68KNOMMU: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
mips [MIPS] sparsemem: fix crash in show_mem 2006-07-13 21:26:22 +01:00
parisc [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
powerpc [PATCH] more fallout from get_property returning pointer to const 2006-09-23 11:34:43 -07:00
ppc [POWERPC] Fix compile error in sbc8560 2006-09-21 22:59:38 +10:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2006-09-22 12:51:33 -07:00
sh Fix 'make headers_check' on sh 2006-09-21 08:36:50 +01:00
sh64 sh64: Add a sane pm_power_off implementation. 2006-09-12 14:40:09 +09:00
sparc [PATCH] sun4: fix sbus_setup_iommu() 2006-09-22 17:48:57 -07:00
sparc64 [SPARC64]: Fix section-mismatch errors in solaris emul module. 2006-09-25 16:39:55 -07:00
um [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
v850 [PATCH] v850: call init_page_count() instead of set_page_count() 2006-07-31 13:28:38 -07:00
x86_64 [PATCH] x86: Add portable getcpu call 2006-09-26 10:52:28 +02:00
xtensa [PATCH] xtensa: ptrace: EXIT_ZOMBIE fix 2006-09-01 11:39:08 -07:00