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Message-ID: <20240905202426.2690105-2-namhyung@kernel.org>
Date: Thu, 5 Sep 2024 13:24:17 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org,
Ravi Bangoria <ravi.bangoria@....com>,
Mark Rutland <mark.rutland@....com>,
James Clark <james.clark@....com>,
Kajol Jain <kjain@...ux.ibm.com>,
Thomas Richter <tmricht@...ux.ibm.com>,
Atish Patra <atishp@...shpatra.org>,
Palmer Dabbelt <palmer@...osinc.com>,
Mingwei Zhang <mizhang@...gle.com>,
James Clark <james.clark@...aro.org>
Subject: [PATCH 01/10] perf tools: Add fallback for exclude_guest
Commit 7b100989b4f6bce70 ("perf evlist: Remove __evlist__add_default")
changed to parse "cycles:P" event instead of creating a new cycles
event for perf record. But it also changed the way how modifiers are
handled so it doesn't set the exclude_guest bit by default.
It seems Apple M1 PMU requires exclude_guest set and returns EOPNOTSUPP
if not. Let's add a fallback so that it can work with default events.
Fixes: 7b100989b4f6bce70 ("perf evlist: Remove __evlist__add_default")
Cc: Mark Rutland <mark.rutland@....com>
Cc: James Clark <james.clark@...aro.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/builtin-stat.c | 3 +--
tools/perf/util/evsel.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index cf985cdb9a6ee588..d8315dae930184ba 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -639,8 +639,7 @@ static enum counter_recovery stat_handle_error(struct evsel *counter)
* (behavior changed with commit b0a873e).
*/
if (errno == EINVAL || errno == ENOSYS ||
- errno == ENOENT || errno == EOPNOTSUPP ||
- errno == ENXIO) {
+ errno == ENOENT || errno == ENXIO) {
if (verbose > 0)
ui__warning("%s event is not supported by the kernel.\n",
evsel__name(counter));
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 49cc71511c0c8ce8..d59ad76b28758906 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3244,6 +3244,27 @@ bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
evsel->core.attr.exclude_kernel = 1;
evsel->core.attr.exclude_hv = 1;
+ return true;
+ } else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest &&
+ !evsel->exclude_GH) {
+ const char *name = evsel__name(evsel);
+ char *new_name;
+ const char *sep = ":";
+
+ /* Is there already the separator in the name. */
+ if (strchr(name, '/') ||
+ (strchr(name, ':') && !evsel->is_libpfm_event))
+ sep = "";
+
+ if (asprintf(&new_name, "%s%sH", name, sep) < 0)
+ return false;
+
+ free(evsel->name);
+ evsel->name = new_name;
+ /* Apple M1 requires exclude_guest */
+ scnprintf(msg, msgsize, "trying to fall back to excluding guest samples");
+ evsel->core.attr.exclude_guest = 1;
+
return true;
}
--
2.46.0.469.g59c65b2a67-goog
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