From 0ae2480784a9fb6598c4500fce08669c57afa970 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 19 Feb 2026 14:57:05 +0000
Subject: Disable PERF_RECORD_COMPRESSED2 with perf record

---
 dev-util/perf/perf-6.18.5-no-compressed2.patch | 60 ++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 dev-util/perf/perf-6.18.5-no-compressed2.patch

(limited to 'dev-util/perf')

diff --git a/dev-util/perf/perf-6.18.5-no-compressed2.patch b/dev-util/perf/perf-6.18.5-no-compressed2.patch
new file mode 100644
index 0000000..7286090
--- /dev/null
+++ b/dev-util/perf/perf-6.18.5-no-compressed2.patch
@@ -0,0 +1,60 @@
+reverted:
+--- perf/builtin-record.c
++++ perf/builtin-record.c
+@@ -650,27 +650,14 @@
+ 	struct record *rec = to;
+ 
+ 	if (record__comp_enabled(rec)) {
+-		struct perf_record_compressed2 *event = map->data;
+-		size_t padding = 0;
+-		u8 pad[8] = {0};
+ 		ssize_t compressed = zstd_compress(rec->session, map, map->data,
+ 						   mmap__mmap_len(map), bf, size);
+ 
+ 		if (compressed < 0)
+ 			return (int)compressed;
+ 
++		size = compressed;
++		bf   = map->data;
+-		bf = event;
+-		thread->samples++;
+-
+-		/*
+-		 * The record from `zstd_compress` is not 8 bytes aligned, which would cause asan
+-		 * error. We make it aligned here.
+-		 */
+-		event->data_size = compressed - sizeof(struct perf_record_compressed2);
+-		event->header.size = PERF_ALIGN(compressed, sizeof(u64));
+-		padding = event->header.size - compressed;
+-		return record__write(rec, map, bf, compressed) ||
+-		       record__write(rec, map, &pad, padding);
+ 	}
+ 
+ 	thread->samples++;
+@@ -1549,7 +1536,7 @@
+ 
+ static size_t process_comp_header(void *record, size_t increment)
+ {
++	struct perf_record_compressed *event = record;
+-	struct perf_record_compressed2 *event = record;
+ 	size_t size = sizeof(*event);
+ 
+ 	if (increment) {
+@@ -1557,7 +1544,7 @@
+ 		return increment;
+ 	}
+ 
++	event->header.type = PERF_RECORD_COMPRESSED;
+-	event->header.type = PERF_RECORD_COMPRESSED2;
+ 	event->header.size = size;
+ 
+ 	return size;
+@@ -1567,7 +1554,7 @@
+ 			    void *dst, size_t dst_size, void *src, size_t src_size)
+ {
+ 	ssize_t compressed;
++	size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
+-	size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed2) - 1;
+ 	struct zstd_data *zstd_data = &session->zstd_data;
+ 
+ 	if (map && map->file)
-- 
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