[PATCH 12/13] perf mem/c2c: Avoid printing empty lines for unsupported events

From: Ravi Bangoria <ravi.bangoria@amd.com>
To: <peterz@infradead.org>, <acme@kernel.org>
Cc: <ravi.bangoria@amd.com>, <jolsa@kernel.org>,
	<namhyung@kernel.org>, <eranian@google.com>, <irogers@google.com>,
	<jmario@redhat.com>, <leo.yan@linaro.org>, <alisaidi@amazon.com>,
	<ak@linux.intel.com>, <kan.liang@linux.intel.com>,
	<dave.hansen@linux.intel.com>, <hpa@zytor.com>,
	<mingo@redhat.com>, <mark.rutland@arm.com>,
	<alexander.shishkin@linux.intel.com>, <tglx@linutronix.de>,
	<bp@alien8.de>, <x86@kernel.org>,
	<linux-perf-users@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <sandipan.das@amd.com>,
	<ananth.narayan@amd.com>, <kim.phillips@amd.com>,
	<santosh.shukla@amd.com>
Subject: [PATCH 12/13] perf mem/c2c: Avoid printing empty lines for unsupported events
Date: Wed, 25 May 2022 15:09:37 +0530	[thread overview]
Message-ID: <20220525093938.4101-13-ravi.bangoria@amd.com> (raw)
In-Reply-To: <20220525093938.4101-1-ravi.bangoria@amd.com>

Perf mem and c2c can be used with 3 different events: load, store and
combined load-store. Some architectures might support only partial set
of events in which case, perf prints empty line for unsupported events.
Avoid that.

Ex, AMD Zen cpus supports only combined load-store event and does not
support individual load store events.

Before patch:
  $ ./perf mem record -e list
  
  
  mem-ldst     : available

After patch:
  $ ./perf mem record -e list
  mem-ldst     : available

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
---
 tools/perf/util/mem-events.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 027cd6d62f21..415d754fea8d 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -156,11 +156,12 @@ void perf_mem_events__list(void)
 	for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
 		struct perf_mem_event *e = perf_mem_events__ptr(j);
 
-		fprintf(stderr, "%-13s%-*s%s\n",
-			e->tag ?: "",
-			verbose > 0 ? 25 : 0,
-			verbose > 0 ? perf_mem_events__name(j, NULL) : "",
-			e->supported ? ": available" : "");
+		fprintf(stderr, "%-*s%-*s%s",
+			e->tag ? 13 : 0,
+			e->tag ? : "",
+			e->tag && verbose > 0 ? 25 : 0,
+			e->tag && verbose > 0 ? perf_mem_events__name(j, NULL) : "",
+			e->supported ? ": available\n" : "");
 	}
 }
 
-- 
2.31.1

