linux-kernel - Re: kmemleak: Early log buffer exceeded

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Date:	Wed, 24 Jun 2009 13:08:09 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...l.by>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: kmemleak: Early log buffer exceeded

On (06/24/09 10:35), Catalin Marinas wrote:
> > So, my questions are:
> > 1. Is 200 really enough? Why 200 not 512, 1024 (for example)?
> 
> It seems that in your case it isn't. It is fine on the machines I tested
> it on but choosing this figure wasn't too scientific.
> 
> I initially had it bigger and marked with the __init attribute to free
> it after initialisation but this was causing (harmless) section mismatch
> warnings.
>
Hello. 

Why not configure it?

//EXAMPLE
config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
	int "Maximum early log entries"
	range 200 2000
	default "300"
	depends on DEBUG_KMEMLEAK
	help
	  Specify early_log size (200,400,etc.).

kmemleak.c
static struct early_log early_log[CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE];

(Well, CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE is a bit ugly.)


> What kind of hardware do you have?
>
Most of time - ASUS F3Jc laptop.

 
> > 2. When (crt_early_log >= ARRAY_SIZE(early_log)) == 1 we just can see stack.
> > Since we have "full" early_log maybe it'll be helpfull to see it?
> 
> I recall allocating this dynamically didn't work properly but I'll give
> it another try. Otherwise, I can make it configurable and print a better
> message (probably without the stack dump).
> 
> -- 
> Catalin
> 

	Sergey
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