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| author |   Jiri Olsa <jolsa@kernel.org> | 2019-03-05 16:25:34 +0100 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-03-06 18:19:45 -0300 |
| commit | 5b61adb16599be04346e7e943c1b5113b57485ad (patch) | |
| tree | 4a54f8bb4e074245c142f459bbb5a9414ecdcd56 /tools/perf/util/evsel.c | |
| parent | perf tools: Read and store caps/max_precise in perf_pmu (diff) | |
| download | linux-dev-5b61adb16599be04346e7e943c1b5113b57485ad.tar.xz linux-dev-5b61adb16599be04346e7e943c1b5113b57485ad.zip | |
perf evsel: Probe for precise_ip with simple attr
Currently we probe for precise_ip with user specified perf_event_attr,
which might fail because of unsupported kernel features, which would get
disabled during the open time anyway.
Switching the probe to take place on simple hw cycles, so the following
record sets proper precise_ip:
# perf record -e cycles:P ls
# perf evlist -v
cycles:P: size: 112, ... precise_ip: 3, ...
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Cc: Nageswara R Sastry <nasastry@in.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lkml.kernel.org/r/20190305152536.21035-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index dfe2958e6287..3bbf73e979c0 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -294,20 +294,12 @@ struct perf_evsel *perf_evsel__new_cycles(bool precise) if (!precise) goto new_event; - /* - * Unnamed union member, not supported as struct member named - * initializer in older compilers such as gcc 4.4.7 - * - * Just for probing the precise_ip: - */ - attr.sample_period = 1; perf_event_attr__set_max_precise_ip(&attr); /* * Now let the usual logic to set up the perf_event_attr defaults * to kick in when we return and before perf_evsel__open() is called. */ - attr.sample_period = 0; new_event: evsel = perf_evsel__new(&attr); if (evsel == NULL) |