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Date: Mon, 2 Jul 2012 08:39:05 -0400
From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [RFC PATCH v2 0/10] makedumpfile: cyclic processing to keep
 memory consumption.
Message-ID: <20120702123905.GG24929@redhat.com>
References: <20120629111320.694ec85b.kumagai-atsushi@mxc.nes.nec.co.jp>
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To: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>
Cc: kexec@lists.infradead.org

On Fri, Jun 29, 2012 at 11:13:20AM +0900, Atsushi Kumagai wrote:
> Hello,
> 
> I improved prototype of cyclic processing as version 2.
> If there is no objection to basic idea, I want to consider the things
> related to performance as next step. (Concretely, buffer size and the patch set
> HATAYAMA-san sent a short time ago.) 
> 

Hi Atushi san,

Good to see this work making progress. I have few queries.

- Do you have some numbers for bigger machines like 1TB or higher memory. 
  I am curious to know how bad is the time penalty.

- Will this work with option -F (flattned format). Often people save
  filtered dump over ssh and we need to make sure it does work with -F
  option too.

> > Version 1:
>  
>   http://lists.infradead.org/pipermail/kexec/2012-May/006363.html

- I have few queries about the diagram in the link above.

- What is 1st cycle, 2nd cycle and 3rd cycle. Are we cycling thorough
  all the pages 3 times for everything?

- What is 1st bitmap and 2nd bitmap and page_header? And why 3 cycles for
  each.

- And why 3 cycles for page_data.

Thanks
Vivek

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