diff options
| author | Andy Lutomirski <[email protected]> | 2016-11-16 10:23:27 -0800 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2016-11-17 08:31:14 +0100 |
| commit | a582c540ac1b10f0a7d37415e04c4af42409fd08 (patch) | |
| tree | 7aa03d7e392b1f08fea2719e66b536113e40c2e7 /scripts/gcc-plugins/cyc_complexity_plugin.c | |
| parent | 89a01c51cbe3b6ae81008e8c91235be583df8c50 (diff) | |
x86/vdso: Use RDPID in preference to LSL when available
RDPID is a new instruction that reads MSR_TSC_AUX quickly. This
should be considerably faster than reading the GDT. Add a
cpufeature for it and use it from __vdso_getcpu() when available.
Tested-by: Megha Dey <[email protected]>
Signed-off-by: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/4f6c3a22012d10f1c65b9ca15800e01b42c7d39d.1479320367.git.luto@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'scripts/gcc-plugins/cyc_complexity_plugin.c')
0 files changed, 0 insertions, 0 deletions