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| author | Vojtech Pavlik <vojtech@suse.cz> | 2006-09-26 10:52:28 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:28 +0200 |
| commit | c08c820508233b424deab3302bc404bbecc6493a (patch) | |
| tree | d6ed79fb2d03513f6c71fc7e47705c4a19512f53 /include/asm-x86_64/vsyscall.h | |
| parent | a670fad0adb1cc6202a607d250f10bd380593905 (diff) | |
| download | linux-c08c820508233b424deab3302bc404bbecc6493a.tar.gz | |
[PATCH] Add the vgetcpu vsyscall
This patch adds a vgetcpu vsyscall, which depending on the CPU RDTSCP
capability uses either the RDTSCP or CPUID to obtain a CPU and node
numbers and pass them to the program.
AK: Lots of changes over Vojtech's original code:
Better prototype for vgetcpu()
It's better to pass the cpu / node numbers as separate arguments
to avoid mistakes when going from SMP to NUMA.
Also add a fast time stamp based cache using a user supplied
argument to speed things more up.
Use fast method from Chuck Ebbert to retrieve node/cpu from
GDT limit instead of CPUID
Made sure RDTSCP init is always executed after node is known.
Drop printk
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/vsyscall.h')
| -rw-r--r-- | include/asm-x86_64/vsyscall.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86_64/vsyscall.h b/include/asm-x86_64/vsyscall.h index 146b24402a5f9..2281e9399b967 100644 --- a/include/asm-x86_64/vsyscall.h +++ b/include/asm-x86_64/vsyscall.h @@ -4,6 +4,7 @@ enum vsyscall_num { __NR_vgettimeofday, __NR_vtime, + __NR_vgetcpu, }; #define VSYSCALL_START (-10UL << 20) @@ -15,6 +16,7 @@ enum vsyscall_num { #include <linux/seqlock.h> #define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16))) +#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16))) #define __section_wall_jiffies __attribute__ ((unused, __section__ (".wall_jiffies"), aligned(16))) #define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16))) #define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16))) @@ -26,6 +28,9 @@ enum vsyscall_num { #define VXTIME_HPET 2 #define VXTIME_PMTMR 3 +#define VGETCPU_RDTSCP 1 +#define VGETCPU_LSL 2 + struct vxtime_data { long hpet_address; /* HPET base address */ int last; @@ -40,6 +45,7 @@ struct vxtime_data { /* vsyscall space (readonly) */ extern struct vxtime_data __vxtime; +extern int __vgetcpu_mode; extern struct timespec __xtime; extern volatile unsigned long __jiffies; extern unsigned long __wall_jiffies; @@ -48,6 +54,7 @@ extern seqlock_t __xtime_lock; /* kernel space (writeable) */ extern struct vxtime_data vxtime; +extern int vgetcpu_mode; extern unsigned long wall_jiffies; extern struct timezone sys_tz; extern int sysctl_vsyscall; @@ -55,6 +62,8 @@ extern seqlock_t xtime_lock; extern int sysctl_vsyscall; +extern void vsyscall_set_cpu(int cpu); + #define ARCH_HAVE_XTIME_LOCK 1 #endif /* __KERNEL__ */ |