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From:   weilin.wang@intel.com
To:     weilin.wang@intel.com, Ian Rogers <irogers@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
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        Adrian Hunter <adrian.hunter@intel.com>,
        Kan Liang <kan.liang@linux.intel.com>
Cc:     linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        Perry Taylor <perry.taylor@intel.com>,
        Samantha Alt <samantha.alt@intel.com>,
        Caleb Biggers <caleb.biggers@intel.com>,
        Mark Rutland <mark.rutland@arm.com>
Subject: [RFC PATCH 18/25] perf stat: Handle NMI in hardware-grouping
Date:   Sun, 24 Sep 2023 23:18:17 -0700
Message-Id: <20230925061824.3818631-19-weilin.wang@intel.com>
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From: Weilin Wang <weilin.wang@intel.com>

Add an easy nmi watchdog support in grouping. When nmi watchdog is enabled,
we reduce the total num of events could be assigned to one group by 1. A
more efficient solution will be added in later.

Signed-off-by: Weilin Wang <weilin.wang@intel.com>
---
 tools/perf/util/metricgroup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 020db8e61..1086da84c 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1850,6 +1850,10 @@ static int insert_new_group(struct list_head *head,
 			   size_t fixed_size)
 {
 	INIT_LIST_HEAD(&new_group->event_head);
+	if (sysctl__nmi_watchdog_enabled()) {
+		pr_debug("NMI watchdog is enabled\n");
+		size -= 1;
+	}
 	fill_counter_bitmap(new_group->gp_counters, 0, size);
 	fill_counter_bitmap(new_group->fixed_counters, 0, fixed_size);
 	new_group->taken_alone = false;
-- 
2.39.3