linux-kernel - Re: [PATCH] Only reset e820 once, even with multiple memmap=exactmap params

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Message-ID: <CAE9FiQXEJ-pYpo7rCg+DpYw9hAFTRz97gR1NgRHBheCxdt0+yw@mail.gmail.com>
Date:	Thu, 10 Jan 2013 09:11:55 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Thomas Renninger <trenn@...e.de>,
	MUNEDA Takahiro <muneda.takahiro@...fujitsu.com>,
	Takao Indoh <indou.takao@...fujitsu.com>,
	linux-pci@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	tokunaga.keiich@...fujitsu.com, kexec@...ts.infradead.org,
	hbabu@...ibm.com, mingo@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, hpa@...or.com, bhelgaas@...gle.com,
	tglx@...utronix.de, khalid@...ehiking.org, horms@...ge.net.au
Subject: Re: [PATCH] Only reset e820 once, even with multiple memmap=exactmap params

On Thu, Jan 10, 2013 at 9:01 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
> On Thu, Jan 10, 2013 at 08:53:18AM -0800, Yinghai Lu wrote:
>> On Thu, Jan 10, 2013 at 6:26 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
>> >
>> > This happens only in case of kdump and not kexec. In case of kdump
>> > we want second kernel to use only selected memory areas.
>> >
>> > In fact this is one improvement area. Instead of using memmap= entries
>> > in kdump case, we should probably modify the e820 map passed in
>> > zero page and get rid of memmap= entries.
>>
>> then how the kdump kernel get saved_max_pfn?
>>
>
> Oh, I forgot about that. May be we can pass saved_max_pfn on command line
> instead of passing all memmap= entries.

then we create another kernel version/kexec tools dependency.

kexec tools need to check kernel version, to see if saved_max_pfn= is supported.
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