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| author | Zachary Amsden <zach@vmware.com> | 2007-03-05 00:30:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-05 07:57:52 -0800 |
| commit | 1182d8528b620c23d043bccbbef092b42062960a (patch) | |
| tree | 3df690a1a731811f8fecda06cb785a5a7b06d4d0 /include/asm-i386/timer.h | |
| parent | 6cb9a8350aee789100a365794272ed20cc8f2401 (diff) | |
| download | linux-1182d8528b620c23d043bccbbef092b42062960a.tar.gz linux-1182d8528b620c23d043bccbbef092b42062960a.tar.bz2 linux-1182d8528b620c23d043bccbbef092b42062960a.zip | |
[PATCH] vmi: cpu cycles fix
In order to share the common code in tsc.c which does CPU Khz calibration, we
need to make an accurate value of CPU speed available to the tsc.c code. This
value loses a lot of precision in a VM because of the timing differences with
real hardware, but we need it to be as precise as possible so the guest can
make accurate time calculations with the cycle counters.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386/timer.h')
| -rw-r--r-- | include/asm-i386/timer.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-i386/timer.h b/include/asm-i386/timer.h index d1f7b4f575b4..12dd67bf760f 100644 --- a/include/asm-i386/timer.h +++ b/include/asm-i386/timer.h @@ -7,6 +7,7 @@ void setup_pit_timer(void); unsigned long long native_sched_clock(void); +unsigned long native_calculate_cpu_khz(void); /* Modifiers for buggy PIT handling */ extern int pit_latch_buggy; @@ -17,6 +18,7 @@ extern int recalibrate_cpu_khz(void); #ifndef CONFIG_PARAVIRT #define get_scheduled_cycles(val) rdtscll(val) +#define calculate_cpu_khz() native_calculate_cpu_khz() #endif #endif |