From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>, Leo Yan <leo.yan@linaro.org>,
John Garry <john.garry@huawei.com>, Will Deacon <will@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Kajol Jain <kjain@linux.ibm.com>,
James Clark <james.clark@arm.com>,
German Gomez <german.gomez@arm.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Riccardo Mancini <rickyman7@gmail.com>,
Andi Kleen <ak@linux.intel.com>,
Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>,
Alexander Antonov <alexander.antonov@linux.intel.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: Stephane Eranian <eranian@google.com>, Ian Rogers <irogers@google.com>
Subject: [PATCH v2 3/6] perf cpumap: Add is_subset function
Date: Mon, 28 Mar 2022 16:26:45 -0700 [thread overview]
Message-ID: <20220328232648.2127340-4-irogers@google.com> (raw)
In-Reply-To: <20220328232648.2127340-1-irogers@google.com>
Returns true if the second argument is a subset of the first.
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/lib/perf/cpumap.c | 20 ++++++++++++++++++++
tools/lib/perf/include/internal/cpumap.h | 1 +
2 files changed, 21 insertions(+)
diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c
index ee66760f1e63..23701024e0c0 100644
--- a/tools/lib/perf/cpumap.c
+++ b/tools/lib/perf/cpumap.c
@@ -319,6 +319,26 @@ struct perf_cpu perf_cpu_map__max(struct perf_cpu_map *map)
return map->nr > 0 ? map->map[map->nr - 1] : result;
}
+/** Is 'b' a subset of 'a'. */
+bool perf_cpu_map__is_subset(const struct perf_cpu_map *a, const struct perf_cpu_map *b)
+{
+ if (a == b || !b)
+ return true;
+ if (!a || b->nr > a->nr)
+ return false;
+
+ for (int i = 0, j = 0; i < a->nr; i++) {
+ if (a->map[i].cpu > b->map[j].cpu)
+ return false;
+ if (a->map[i].cpu == b->map[j].cpu) {
+ j++;
+ if (j == b->nr)
+ return true;
+ }
+ }
+ return false;
+}
+
/*
* Merge two cpumaps
*
diff --git a/tools/lib/perf/include/internal/cpumap.h b/tools/lib/perf/include/internal/cpumap.h
index 1973a18c096b..35dd29642296 100644
--- a/tools/lib/perf/include/internal/cpumap.h
+++ b/tools/lib/perf/include/internal/cpumap.h
@@ -25,5 +25,6 @@ struct perf_cpu_map {
#endif
int perf_cpu_map__idx(const struct perf_cpu_map *cpus, struct perf_cpu cpu);
+bool perf_cpu_map__is_subset(const struct perf_cpu_map *a, const struct perf_cpu_map *b);
#endif /* __LIBPERF_INTERNAL_CPUMAP_H */
--
2.35.1.1021.g381101b075-goog
next prev parent reply other threads:[~2022-03-28 23:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-28 23:26 [PATCH v2 0/6] Make evlist CPUs more accurate Ian Rogers
2022-03-28 23:26 ` [PATCH v2 1/6] perf stat: Avoid segv if core.user_cpus isn't set Ian Rogers
2022-03-28 23:26 ` [PATCH v2 2/6] perf evlist: Rename cpus to user_requested_cpus Ian Rogers
2022-03-30 20:31 ` Arnaldo Carvalho de Melo
2022-03-28 23:26 ` Ian Rogers [this message]
2022-03-30 20:34 ` [PATCH v2 3/6] perf cpumap: Add is_subset function Arnaldo Carvalho de Melo
2022-03-28 23:26 ` [PATCH v2 4/6] perf cpumap: More cpu map reuse by merge Ian Rogers
2022-03-30 20:34 ` Arnaldo Carvalho de Melo
2022-03-28 23:26 ` [PATCH v2 5/6] perf cpumap: Add intersect function Ian Rogers
2022-04-01 19:12 ` Arnaldo Carvalho de Melo
2022-03-28 23:26 ` [PATCH v2 6/6] perf evlist: Respect all_cpus when setting user_requested_cpus Ian Rogers
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