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| author | Kan Liang <[email protected]> | 2020-07-03 05:49:07 -0700 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2020-07-08 11:38:51 +0200 |
| commit | bd657aa3dd8514e62486ce7f90b5e484c18d684d (patch) | |
| tree | ee416e22027b77d7ce2b63e3d3332ba3c141b954 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py | |
| parent | 78c2141b654375079e3737f06f19cabfc0fcecd7 (diff) | |
x86/cpufeatures: Add Architectural LBRs feature bit
CPUID.(EAX=07H, ECX=0):EDX[19] indicates whether an Intel CPU supports
Architectural LBRs.
The "X86_FEATURE_..., word 18" is already mirrored from CPUID
"0x00000007:0 (EDX)". Add X86_FEATURE_ARCH_LBR under the "word 18"
section.
The feature will appear as "arch_lbr" in /proc/cpuinfo.
The Architectural Last Branch Records (LBR) feature enables recording
of software path history by logging taken branches and other control
flows. The feature will be supported in the perf_events subsystem.
Signed-off-by: Kan Liang <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Dave Hansen <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py')
0 files changed, 0 insertions, 0 deletions