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From:   Leo Yan <leo.yan@linaro.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
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        Namhyung Kim <namhyung@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Ian Rogers <irogers@google.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
        Kemeng Shi <shikemeng@huawei.com>,
        James Clark <james.clark@arm.com>,
        Wei Li <liwei391@huawei.com>, Al Grant <Al.Grant@arm.com>,
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        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Mike Leach <mike.leach@linaro.org>,
        linux-kernel@vger.kernel.org
Cc:     Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v2 04/14] perf mem: Only initialize memory event for recording
Date:   Tue,  1 Sep 2020 09:38:05 +0100
Message-Id: <20200901083815.13755-5-leo.yan@linaro.org>
In-Reply-To: <20200901083815.13755-1-leo.yan@linaro.org>
References: <20200901083815.13755-1-leo.yan@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

It's needless to initialize memory events for perf reporting, so only
initialize memory event for perf recording.  This change allows to parse
perf data on cross platforms, e.g. perf tool can output reports even the
machine doesn't enable any memory events.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 tools/perf/builtin-mem.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index 9fd730019e45..b9432ee27754 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -78,6 +78,11 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 	OPT_END()
 	};
 
+	if (perf_mem_events__init()) {
+		pr_err("failed: memory events not supported\n");
+		return -1;
+	}
+
 	argc = parse_options(argc, argv, options, record_mem_usage,
 			     PARSE_OPT_KEEP_UNKNOWN);
 
@@ -439,11 +444,6 @@ int cmd_mem(int argc, const char **argv)
 		NULL
 	};
 
-	if (perf_mem_events__init()) {
-		pr_err("failed: memory events not supported\n");
-		return -1;
-	}
-
 	argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
 					mem_usage, PARSE_OPT_KEEP_UNKNOWN);
 
-- 
2.20.1