linux-kernel - Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X consistent with kaslr

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Message-ID: <20190225113003.GE26145@zn.tnic>
Date:   Mon, 25 Feb 2019 12:30:03 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Young <dyoung@...hat.com>
Cc:     Joerg Roedel <jroedel@...e.de>, bhe@...hat.com,
        Jerry Hoemann <jerry.hoemann@....com>, x86@...nel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pingfan Liu <kernelfans@...il.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>, yinghai@...nel.org,
        vgoyal@...hat.com, iommu@...ts.linux-foundation.org,
        konrad.wilk@...cle.com
Subject: Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X
 consistent with kaslr

On Mon, Feb 25, 2019 at 07:12:16PM +0800, Dave Young wrote:
> If we move to high as default, it will allocate 160M high + 256M low. It

We won't move to high by default - we will *fall* back to high if the
default allocation fails.

> To make the process less fragile maybe we can remove the 896M limitation
> and only try <4G then go to high.

Sure, the more robust for the user, the better.

-- 
Regards/Gruss,
    Boris.

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