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| author |   Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2019-11-05 10:27:01 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-11-13 11:06:18 +0100 |
| commit | 295c52ee1485e4dee660fc1a0e6ceed6c803c9d3 (patch) | |
| tree | f7d128e0f95aa214fb7edd20b565eaae1577f16c /arch/x86/events/intel/pt.h | |
| parent | perf/x86/intel/pt: Opportunistically use single range output mode (diff) | |
| download | linux-dev-295c52ee1485e4dee660fc1a0e6ceed6c803c9d3.tar.xz linux-dev-295c52ee1485e4dee660fc1a0e6ceed6c803c9d3.zip | |
perf/x86/intel/pt: Prevent redundant WRMSRs
With recent optimizations to AUX and PT buffer management code (high order
AUX allocations, opportunistic Single Range Output), it is far more likely
now that the output MSRs won't need reprogramming on every sched-in.
To avoid needless WRMSRs of those registers, cache their values and only
write them when needed.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20191105082701.78442-3-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/events/intel/pt.h')
| -rw-r--r-- | arch/x86/events/intel/pt.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h index 3f7818221b95..96906a62aacd 100644 --- a/arch/x86/events/intel/pt.h +++ b/arch/x86/events/intel/pt.h @@ -113,16 +113,20 @@ struct pt_filters { /** * struct pt - per-cpu pt context - * @handle: perf output handle + * @handle: perf output handle * @filters: last configured filters - * @handle_nmi: do handle PT PMI on this cpu, there's an active event - * @vmx_on: 1 if VMX is ON on this cpu + * @handle_nmi: do handle PT PMI on this cpu, there's an active event + * @vmx_on: 1 if VMX is ON on this cpu + * @output_base: cached RTIT_OUTPUT_BASE MSR value + * @output_mask: cached RTIT_OUTPUT_MASK MSR value */ struct pt { struct perf_output_handle handle; struct pt_filters filters; int handle_nmi; int vmx_on; + u64 output_base; + u64 output_mask; }; #endif /* __INTEL_PT_H__ */ |