linux-kernel - Re: [PATCH] x86, kdump: crashkernel=X try to reserve below 896M first, then try below 4G, then MAXMEM

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Message-ID: <20131028054739.GA20741@dhcp-16-126.nay.redhat.com>
Date:	Mon, 28 Oct 2013 13:47:39 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Vivek Goyal <vgoyal@...hat.com>, WANG Chao <chaowang@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Pekka Enberg <penberg@...nel.org>,
	Jacob Shin <jacob.shin@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, kdump: crashkernel=X try to reserve below 896M
 first, then try below 4G, then MAXMEM

> Again, for distribution, when new kernel is added, new kernel will all
> have ",high"
> and new kexec-tools get installed.
> 
> Even we want to extend crashkernel=XM, then i would like to have
> it identical to crashkernel=XM,high instead.

My points: I can accept the approach of extending crashkernel=XM to
use high mem firstly if we could remove the extra 72M in low mem, but
apparently it's not doable now. So I would vote for Chao's patch.

Also newer kernel use more complex ",high" then older kernel looks not good.

Thanks
Dave
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