linux-kernel - Re: [RFC PATCH] Expand memblock=debug to provide a bit more details (v1).

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Message-ID: <20120504192459.GA5684@phenom.dumpdata.com>
Date:	Fri, 4 May 2012 15:24:59 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org, hpa@...ux.intel.com,
	paul.gortmaker@...driver.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org
Subject: Re: [RFC PATCH] Expand memblock=debug to provide a bit more details
 (v1).

On Fri, May 04, 2012 at 12:22:58PM -0700, Yinghai Lu wrote:
> On Fri, May 4, 2012 at 11:49 AM, Konrad Rzeszutek Wilk
> <konrad.wilk@...cle.com> wrote:
> > While trying to track down some memory allocation issues, I realized that
> > memblock=debug was giving some information, but for guests with 256GB or
> > so the majority of it was just:
> >
> >  memblock_reserve: [0x00003efeeea000-0x00003efeeeb000] __alloc_memory_core_early+0x5c/0x64
> >
> > which really didn't tell me that much. With these patches I know it is:
> >
> >  memblock_reserve: [0x00003ffe724000-0x00003ffe725000] (4kB) vmemmap_pmd_populate+0x4b/0xa2
> >
> > .. which isn't really that useful for the problem I was tracking down, but
> > it does help in figuring out which routines are using memblock.
> >
> 
> that RET_IP is not very helpful for debugging.

Is there a better way of doing it that is automatic?
> 
> Actually I have local debug patch for memblock. please check if that
> is going to help debugging.
> 
> Thanks
> 
> Yinghai



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