linux-kernel - [PATCH] kmemleak: Increase maximum early log entries to 1000000

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Message-Id: <20190723072605.103456-1-drinkcat@chromium.org>
Date:   Tue, 23 Jul 2019 15:26:05 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Changbin Du <changbin.du@...el.com>,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: [PATCH] kmemleak: Increase maximum early log entries to 1000000

When KASan is enabled, a lot of memory is allocated early on,
and kmemleak complains (this is on a 4GB RAM system):
kmemleak: Early log buffer exceeded (129846), please increase
  DEBUG_KMEMLEAK_EARLY_LOG_SIZE

Let's increase the upper limit to 1M entry. That would take up
160MB of RAM at init (each early_log entry is 160 bytes), but
the memory would later be freed (early_log is __initdata).

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
---
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f567875b87657de..1a197b8125768b9 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -595,7 +595,7 @@ config DEBUG_KMEMLEAK
 config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
 	int "Maximum kmemleak early log entries"
 	depends on DEBUG_KMEMLEAK
-	range 200 40000
+	range 200 1000000
 	default 400
 	help
 	  Kmemleak must track all the memory allocations to avoid
-- 
2.22.0.657.g960e92d24f-goog