Ian Rogers 0a892c1c94 perf record: Add dummy event during system wide synthesis
During the processing of /proc during event synthesis new processes may
start. Add a dummy event if /proc is to be processed, to capture mmaps
for starting processes. This reuses the existing logic for
initial-delay.

v3 fixes the attr test of test-record-C0
v2 fixes the dummy event configuration and a branch stack issue.

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200422173615.59436-1-irogers@google.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-05-28 10:03:25 -03:00

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[config]
command = record
args = --no-bpf-event -C 0 kill >/dev/null 2>&1
ret = 1
[event:base-record]
cpu=0
# no enable on exec for CPU attached
enable_on_exec=0
# PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_TIME |
# PERF_SAMPLE_ID | PERF_SAMPLE_PERIOD
# + PERF_SAMPLE_CPU added by -C 0
sample_type=455
# Dummy event handles mmaps, comm and task.
mmap=0
comm=0
task=0
[event:system-wide-dummy]