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Impact: extend performance counter support on x86 Intel CPUs
Modern Intel CPUs have 3 "fixed-function" performance counters, which
count these hardware events:
Instr_Retired.Any
CPU_CLK_Unhalted.Core
CPU_CLK_Unhalted.Ref
Add support for them to the performance counters subsystem.
Their use is transparent to user-space: the counter scheduler is
extended to automatically recognize the cases where a fixed-function
PMC can be utilized instead of a generic PMC. In such cases the
generic PMC is kept available for more counters.
The above fixed-function events map to these generic counter hw events:
PERF_COUNT_INSTRUCTIONS
PERF_COUNT_CPU_CYCLES
PERF_COUNT_BUS_CYCLES
(The 'bus' cycles are in reality often CPU-ish cycles, just with a fixed
frequency.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: clean up
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Enumerate fixed-mode PMCs based on CPUID, and feed that into the
perfcounter code.
Does not use fixed-mode PMCs yet.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: refactor the x86 code for fixed-mode PMCs
Extend the data structures and rename the existing facilities
to allow for a 'generic' versus 'fixed' counter distinction.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: rename include file
We'll be providing an asm/perf_counter.h to the generic perfcounter code,
so use the already existing x86 file for this purpose and rename it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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