diff options
| author | Kan Liang <kan.liang@linux.intel.com> | 2021-01-28 14:40:11 -0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-02-01 15:31:37 +0100 |
| commit | 32451614da2a9cf4296f90d3606ac77814fb519d (patch) | |
| tree | eb10379172cae2e6a898e863dd98dc87ad760ad1 /net | |
| parent | 61b985e3e775a3a75fda04ce7ef1b1aefc4758bc (diff) | |
perf/x86/intel: Support CPUID 10.ECX to disable fixed counters
With Architectural Performance Monitoring Version 5, CPUID 10.ECX cpu
leaf indicates the fixed counter enumeration. This extends the previous
count to a bitmap which allows disabling even lower fixed counters.
It could be used by a Hypervisor.
The existing intel_ctrl variable is used to remember the bitmask of the
counters. All code that reads all counters is fixed to check this extra
bitmask.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Originally-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1611873611-156687-6-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions