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

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Message-ID: <CAE9FiQWOps3Hmw=p6mWObRnu2KHVNshpoY+uWcAAQd1Yxi54yQ@mail.gmail.com>
Date:	Fri, 4 May 2012 12:22:58 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
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 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.

Actually I have local debug patch for memblock. please check if that
is going to help debugging.

Thanks

Yinghai

Download attachment "nobootmem_name_1.patch" of type "application/octet-stream" (13143 bytes)

Download attachment "nobootmem_name_2.patch" of type "application/octet-stream" (21862 bytes)