linux-kernel - [PATCH 2/2] mm/kmemleak: Disable KASAN instrumentation in kmemleak

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Message-Id: <20240307190548.963626-3-longman@redhat.com>
Date: Thu,  7 Mar 2024 14:05:48 -0500
From: Waiman Long <longman@...hat.com>
To: Catalin Marinas <catalin.marinas@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Waiman Long <longman@...hat.com>
Subject: [PATCH 2/2] mm/kmemleak: Disable KASAN instrumentation in kmemleak

Kmemleak ia a memory leak checker. KASAN is also a memory checker but
it focuses more on finding out-of-bounds and use-after-free bugs. Since
kmemleak is inherently slow especially on systems with large number of
CPUs, adding KASAN instrumentation will make it slower even more. As
kmemleak is not for production use, the utility of enabling KASAN there
is questionable.

This patch disables KASAN instrumentation for configurations that
enable both of them to slightly reduce performance overhead.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 mm/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Makefile b/mm/Makefile
index e4b5b75aaec9..fc0f9a63a61e 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -5,6 +5,7 @@

 KASAN_SANITIZE_slab_common.o := n
 KASAN_SANITIZE_slub.o := n
+KASAN_SANITIZE_kmemleak.o := n
 KCSAN_SANITIZE_kmemleak.o := n

 # These produce frequent data race reports: most of them are due to races on
-- 
2.39.3