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| author |   Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2019-11-05 10:27:00 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-11-13 11:06:17 +0100 |
| commit | 670638477aede0d7a355ced04b569214aa3feacd (patch) | |
| tree | 6b182fa1d1bf57e6a150965c0057e4c0fe79d600 /arch/x86/events/intel/pt.h | |
| parent | perf/x86/intel/pt: Add sampling support (diff) | |
| download | linux-dev-670638477aede0d7a355ced04b569214aa3feacd.tar.xz linux-dev-670638477aede0d7a355ced04b569214aa3feacd.zip | |
perf/x86/intel/pt: Opportunistically use single range output mode
Most of PT implementations support Single Range Output mode, which is
an alternative to ToPA that can be used for a single contiguous buffer
and if we don't require an interrupt, that is, in AUX snapshot mode.
Now that perf core will use high order allocations for the AUX buffer,
in many cases the first condition will also be satisfied.
The two most obvious benefits of the Single Range Output mode over the
ToPA are:
* not having to allocate the ToPA table(s),
* not using the ToPA walk hardware.
Make use of this functionality where available and appropriate.
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/20191105082701.78442-2-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 | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h index 1d2bb7572374..3f7818221b95 100644 --- a/arch/x86/events/intel/pt.h +++ b/arch/x86/events/intel/pt.h @@ -64,6 +64,7 @@ struct pt_pmu { * @lost: if data was lost/truncated * @head: logical write offset inside the buffer * @snapshot: if this is for a snapshot/overwrite counter + * @single: use Single Range Output instead of ToPA * @stop_pos: STOP topa entry index * @intr_pos: INT topa entry index * @stop_te: STOP topa entry pointer @@ -80,6 +81,7 @@ struct pt_buffer { local_t data_size; local64_t head; bool snapshot; + bool single; long stop_pos, intr_pos; struct topa_entry *stop_te, *intr_te; void **data_pages; |