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perf intel-pt: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID

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Originally, software only supported redirecting at most one PEBS event to
Intel PT (PEBS-via-PT) because it was not able to differentiate one event
from another. To overcome that, add support for the
PERF_RECORD_AUX_OUTPUT_HW_ID side-band event.

Committer notes:

Cast the pointer arg to for_each_set_bit() to (unsigned long *), to fix
the build on 32-bit systems.

Reviewed-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20210907163903.11820-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2021-09-07 19:39:03 +03:00 • committed by Arnaldo Carvalho de Melo
parent 6175047358
commit dedcc0ea6d
2 changed files with 87 additions and 5 deletions
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7
tools/perf/Documentation/perf-intel-pt.txt
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@ -1144,7 +1144,12 @@ Recording is selected by using the aux-output config term e.g.
perf record -c 10000 -e '{intel_pt/branch=0/,cycles/aux-output/ppp}' uname
Note that currently, software only supports redirecting at most one PEBS event.
Originally, software only supported redirecting at most one PEBS event because it
was not able to differentiate one event from another. To overcome that, more recent
kernels and perf tools add support for the PERF_RECORD_AUX_OUTPUT_HW_ID side-band event.
To check for the presence of that event in a PEBS-via-PT trace:
perf script -D --no-itrace | grep PERF_RECORD_AUX_OUTPUT_HW_ID
To display PEBS events from the Intel PT trace, use the itrace 'o' option e.g.