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authorAndi Kleen <ak@suse.de>2006-01-11 22:45:24 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:58 -0800
commitc818a18146997d1356a4840b0c01f1168c16c8a4 (patch)
tree8d7e049742e87666bf3089fe46e04828b6417fd7 /arch/x86_64/kernel/vsyscall.c
parent7f6c5b046978d68e69bdc73433ead41612a2a1c9 (diff)
[PATCH] x86_64: On Intel CPUs don't do an additional CPU sync before RDTSC
RDTSC serialization using cpuid is not needed for Intel platforms. This increases gettimeofday performance. Cc: vojtech@suse.cz Cc: rohit.seth@intel.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/vsyscall.c')
-rw-r--r--arch/x86_64/kernel/vsyscall.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index 70a0bd16085..9e51047fc41 100644
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -66,8 +66,7 @@ static force_inline void do_vgettimeofday(struct timeval * tv)
(__jiffies - __wall_jiffies) * (1000000 / HZ);
if (__vxtime.mode != VXTIME_HPET) {
- sync_core();
- rdtscll(t);
+ t = get_cycles_sync();
if (t < __vxtime.last_tsc)
t = __vxtime.last_tsc;
usec += ((t - __vxtime.last_tsc) *