linux-kernel - [RFC PATCH v2 14/17] perf stat: Handle NMI in hardware-grouping

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Message-Id: <20231014015202.1175377-15-weilin.wang@intel.com>
Date:   Fri, 13 Oct 2023 18:51:59 -0700
From:   weilin.wang@...el.com
To:     weilin.wang@...el.com, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Yang Jihong <yangjihong1@...wei.com>
Subject: [RFC PATCH v2 14/17] perf stat: Handle NMI in hardware-grouping

From: Weilin Wang <weilin.wang@...el.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@...el.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 100c9d948..7da91cbd3 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1852,6 +1852,10 @@ 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