[PATCH] x86: Use RDTSCP for synchronous get_cycles if possible

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RDTSCP is already synchronous and doesn't need an explicit CPUID.
This is a little faster and more importantly avoids VMEXITs on Hypervisors.

Original patch from Joerg Roedel, but reworked by AK
Also includes miscompilation fix by Eric Biederman

Cc: "Joerg Roedel" <joerg.roedel@amd.com>

Signed-off-by: Andi Kleen <ak@suse.de>

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Andi Kleen 2007-05-02 19:27:21 +02:00 • committed by Andi Kleen

parent 9bccb23dc5

commit c5bcb5635a

1 changed files with 9 additions and 0 deletions

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include/asm-i386/tsc.h

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