File perf-evsel-Improve-error-message-for-uncore-eve... of Package perf.27729

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File perf-evsel-Improve-error-message-for-uncore-events.patch of Package perf.27729

From: Ian Rogers <irogers@google.com>
Date: Thu, 23 Dec 2021 10:39:48 -0800
Subject: perf evsel: Improve error message for uncore events
Git-commit: dcffc5ebb80dd5887b91091b8ecd082c9ed75361
References: jsc#SLE-24578 (dependent patch)
Signed-off-by: Tony Jones <tonyj@suse.de>

When a group has multiple events and the leader fails it can yield
errors like:

$ perf stat -e '{uncore_imc/cas_count_read/},instructions' /bin/true
  Error:
  The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (uncore_imc/cas_count_read/).
  /bin/dmesg | grep -i perf may provide additional information.

However, when not the group leader <not supported> is given:

$ perf stat -e '{instructions,uncore_imc/cas_count_read/}' /bin/true
  ...
           1,619,057      instructions
     <not supported> MiB  uncore_imc/cas_count_read/

This is necessary because get_group_fd will fail if the leader fails and
is the direct result of the check on line 750 of builtin-stat.c in
stat_handle_error that returns COUNTER_SKIP for the latter case.

This patch improves the error message to:

$ perf stat -e '{uncore_imc/cas_count_read/},instructions' /bin/true
  Error:
  Invalid event (uncore_imc/cas_count_read/) in per-thread mode, enable system wide with '-a'.

v2. Changed the test to use !target__has_cpu as suggested by Namhyung Kim.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.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: https://lore.kernel.org/r/20211223183948.3423989-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Tony Jones <tonyj@suse.de>
---
 tools/perf/util/evsel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 656c30b988ce..a0acf53a2510 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2931,6 +2931,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
 			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
 		if (perf_missing_features.aux_output)
 			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
+		if (!target__has_cpu(target))
+			return scnprintf(msg, size,
+	"Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
+					evsel__name(evsel));
 		break;
 	case ENODATA:
 		return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "

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File perf-evsel-Improve-error-message-for-uncore-events.patch of Package perf.27729

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