Commit 730670b1 authored Jun 28, 2019 by John Garry Committed by Arnaldo Carvalho de Melo Jul 02, 2019

perf pmu: Support more complex PMU event aliasing



The jevent "Unit" field is used for uncore PMU alias definition.

The form uncore_pmu_example_X is supported, where "X" is a wildcard, to
support multiple instances of the same PMU in a system.

Unfortunately this format not suitable for all uncore PMUs; take the
Hisi DDRC uncore PMU for example, where the name is in the form
hisi_scclX_ddrcY.

For for current jevent parsing, we would be required to hardcode an
uncore alias translation for each possible value of X. This is not
scalable.

Instead, add support for "Unit" field in the form "hisi_sccl,ddrc",
where we can match by hisi_scclX and ddrcY. Tokens  in Unit field are
delimited by ','.

Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxarm@huawei.com
Link: http://lkml.kernel.org/r/1561732552-143038-2-git-send-email-john.garry@huawei.com


[ Shut up older gcc complianing about the last arg to strtok_r() being uninitialized, set that tmp to NULL ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent c8f7bc1a

tools/perf/util/pmu.c

+41 −5

Original line number	Diff line number	Diff line
		@@ -701,6 +701,46 @@ struct pmu_events_map perf_pmu__find_map(struct perf_pmu pmu)
		return map;
		}

		static bool pmu_uncore_alias_match(const char pmu_name, const char name)
		{
		char tmp = NULL, tok, *str;
		bool res;

		str = strdup(pmu_name);
		if (!str)
		return false;

		/*
		* uncore alias may be from different PMU with common prefix
		*/
		tok = strtok_r(str, ",", &tmp);
		if (strncmp(pmu_name, tok, strlen(tok))) {
		res = false;
		goto out;
		}

		/*
		* Match more complex aliases where the alias name is a comma-delimited
		* list of tokens, orderly contained in the matching PMU name.
		*
		* Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
		* match "socket" in "socketX_pmunameY" and then "pmuname" in
		* "pmunameY".
		*/
		for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
		name = strstr(name, tok);
		if (!name) {
		res = false;
		goto out;
		}
		}

		res = true;
		out:
		free(str);
		return res;
		}

		/*
		* From the pmu_events_map, find the table of PMU events that corresponds
		* to the current running CPU. Then, add all PMU events from that table
		@@ -731,12 +771,8 @@ static void pmu_add_cpu_aliases(struct list_head head, struct perf_pmu pmu)
		break;
		}

		/*
		* uncore alias may be from different PMU
		* with common prefix
		*/
		if (pmu_is_uncore(name) &&
		!strncmp(pname, name, strlen(pname)))
		pmu_uncore_alias_match(pname, name))
		goto new_alias;

		if (strcmp(pname, name))

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