linux-kernel - Re: [PATCH] kmemleak: Increase DEBUG_KMEMLEAK_EARLY_LOG

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Message-ID: <20190730154204.GC15386@arrakis.emea.arm.com>
Date:   Tue, 30 Jul 2019 16:42:05 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Uladzislau Rezki <urezki@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: [PATCH] kmemleak: Increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default
 to 16K

On Tue, Jul 30, 2019 at 11:40:27PM +0800, Nicolas Boichat wrote:
> The current default value (400) is too low on many systems (e.g.
> some ARM64 platform takes up 1000+ entries).
> 
> syzbot uses 16000 as default value, and has proved to be enough
> on beefy configurations, so let's pick that value.
> 
> This consumes more RAM on boot (each entry is 160 bytes, so
> in total ~2.5MB of RAM), but the memory would later be freed
> (early_log is __initdata).
> 
> Suggested-by: Dmitry Vyukov <dvyukov@...gle.com>
> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>

Acked-by: Catalin Marinas <catalin.marinas@....com>