Andi Kleen
c5bcb5635a
[PATCH] x86: Use RDTSCP for synchronous get_cycles if possible
...
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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