TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
3cfc348bf9
twx-linux/arch/i386/kernel
History
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
..
acpi Merge trivial low-risk suspend hotkey bugzilla-5918 into release 2006-08-20 21:49:29 -04:00
cpu [CPUFREQ] sw_any_bug_dmi_table can be used on resume, so it isn't initdata 2006-09-22 19:18:19 -04:00
.gitignore
alternative.c [PATCH] lockdep: x86 smp alternatives workaround 2006-07-03 15:27:04 -07:00
apic.c [PATCH] i386: Add SMP support on i386 to reservation framework 2006-09-26 10:52:26 +02:00
apm.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
asm-offsets.c [PATCH] vdso: randomize the i386 vDSO by moving it into a vma 2006-06-27 17:32:38 -07:00
bootflag.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpuid.c [PATCH] Fix modular cpuid.ko 2006-07-03 21:25:20 -07:00
crash_dump.c
crash.c [PATCH] i386: Kdump i386 nmi event notification fix 2006-09-26 10:52:27 +02:00
doublefault.c [PATCH] i386: cpu_relax() in crash.c and doublefault.c 2006-06-25 10:00:55 -07:00
early_printk.c
efi_stub.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
efi.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
entry.S x86: save/restore eflags in context switch 2006-09-18 16:20:40 -07:00
head.S [PATCH] i386: Add kernel thread stack frame termination for properly stopping stack unwinds. 2006-08-30 16:05:15 -07:00
hpet.c [PATCH] Fix faulty HPET clocksource usage (fix for bug #7062) 2006-09-01 11:39:08 -07:00
i386_ksyms.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
i387.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
i8237.c
i8253.c [PATCH] time: fix time going backward w/ clock=pit 2006-06-26 09:58:21 -07:00
i8259.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
init_task.c
io_apic.c [PATCH] i386: Allow to use GENERICARCH for UP kernels 2006-09-26 10:52:26 +02:00
ioport.c [PATCH] i386: use thread_info flags for debug regs and IO bitmaps 2006-07-09 18:47:12 -07:00
irq.c [PATCH] i386: Fix stack switching in do_IRQ 2006-08-30 16:05:16 -07:00
kprobes.c [PATCH] kprobe-booster: disable in preemptible kernel 2006-07-31 13:28:38 -07:00
ldt.c
machine_kexec.c [PATCH] machine_kexec.c: Fix the description of segment handling 2006-07-31 13:28:38 -07:00
Makefile [PATCH] syscall class hookup for all normal targets 2006-09-12 03:04:40 -04:00
mca.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
microcode.c [PATCH] devfs: Remove the miscdevice devfs_name field as it's no longer needed 2006-06-26 12:25:08 -07:00
module.c
mpparse.c [PATCH] i386: Allow to use GENERICARCH for UP kernels 2006-09-26 10:52:26 +02:00
msr.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2006-06-30 15:39:30 -07:00
nmi.c [PATCH] x86: i386/x86-64 Add nmi watchdog support for new Intel CPUs 2006-09-26 10:52:27 +02:00
numaq.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci-dma.c
process.c [PATCH] i386: switch_to(): misplaced parentheses 2006-07-28 19:22:35 -07:00
ptrace.c [PATCH] i386: use thread_info flags for debug regs and IO bitmaps 2006-07-09 18:47:12 -07:00
quirks.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
reboot_fixups.c
reboot.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
relocate_kernel.S
scx200.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
semaphore.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
setup.c Revert mmiocfg heuristics and blacklist changes 2006-09-19 08:15:22 -07:00
sigframe.h
signal.c [PATCH] vdso: randomize the i386 vDSO by moving it into a vma 2006-06-27 17:32:38 -07:00
smp.c [PATCH] x86_64: Standardize i386/x86_64 handling of NMI_VECTOR 2006-06-26 10:48:22 -07:00
smpboot.c [PATCH] i386/x86-64: Fix NMI watchdog suspend/resume 2006-09-26 10:52:27 +02:00
srat.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
stacktrace.c [PATCH] lockdep: stacktrace subsystem, i386 support 2006-07-03 15:27:02 -07:00
summit.c
sys_i386.c
syscall_table.S [PATCH] x86: Add portable getcpu call 2006-09-26 10:52:28 +02:00
sysenter.c [PATCH] small fix for not releasing the mmap semaphore in i386/arch_setup_additional_pages 2006-06-28 12:05:50 -07:00
time_hpet.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
time.c [PATCH] i386/x86-64: Add user_mode checks to profile_pc for oprofile 2006-07-28 19:28:00 -07:00
topology.c [PATCH] node hotplug: register cpu: remove node struct 2006-06-27 17:32:37 -07:00
trampoline.S
traps.c [PATCH] x86: x86 clean up nmi panic messages 2006-09-26 10:52:27 +02:00
tsc.c [PATCH] generic-time: add macro to simplify/hide mask constants 2006-06-26 09:58:21 -07:00
vm86.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vmlinux.lds.S [PATCH] i386: reliable stack trace support (i386) 2006-06-26 10:48:17 -07:00
vsyscall-int80.S
vsyscall-note.S
vsyscall-sigreturn.S
vsyscall-sysenter.S [PATCH] vdso: randomize the i386 vDSO by moving it into a vma 2006-06-27 17:32:38 -07:00
vsyscall.lds.S [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
vsyscall.S