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Subject[RFC PATCH v4 12/15] perf stat: Handle NMI in hardware-grouping
Date
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 95d3868819e3..f1eb73957765 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1947,6 +1947,10 @@ static int insert_new_group(struct list_head *head,
size_t num_fixed_counters)
{
INIT_LIST_HEAD(&new_group->event_head);
+ if (sysctl__nmi_watchdog_enabled()) {
+ pr_debug("NMI watchdog is enabled. Reduce num of counters by 1\n");
+ num_counters -= 1;
+ }
fill_counter_bitmap(new_group->gp_counters, 0, num_counters);
fill_counter_bitmap(new_group->fixed_counters, 0, num_fixed_counters);
new_group->taken_alone = false;
--
2.42.0

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