From e252b3d75dc9247fee0629338f3f21872b1823fa Mon Sep 17 00:00:00 2001
From: Herman Zhu <zhuhuijunzhj@gmail.com>
Date: Thu, 4 Jul 2024 12:45:28 +0800
Subject: [PATCH] fix(perf) skip to process nil ring

Signed-off-by: zhuhuijun <zhuhuijunzhj@gmail.com>
---
 perf/reader.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/perf/reader.go b/perf/reader.go
index ee557e449..79c4f502d 100644
--- a/perf/reader.go
+++ b/perf/reader.go
@@ -386,6 +386,11 @@ func (pr *Reader) ReadInto(rec *Record) error {
 			// Waking up userspace is expensive, make the most of it by checking
 			// all rings.
 			for _, ring := range pr.rings {
+				// Skip rings that are not currently enabled.
+				if ring == nil {
+					continue
+				}
+
 				ring.loadHead()
 				pr.epollRings = append(pr.epollRings, ring)
 			}