linux-kernel - Re: [PATCH 1/1] kernel/crash_core.c - Add crashkernel=auto for x86 and ARM

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Message-ID: <20210122031244.GA4717@dhcp-128-65.nay.redhat.com>
Date:   Fri, 22 Jan 2021 11:12:44 +0800
From:   Dave Young <dyoung@...hat.com>
To:     john.p.donnelly@...cle.com
Cc:     Guilherme Piccoli <gpiccoli@...onical.com>,
        Kairui Song <kasong@...hat.com>,
        Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "H. Peter Anvin" <hpa@...or.com>, Will Deacon <will@...nel.org>,
        Anson Huang <Anson.Huang@....com>,
        Jonathan Corbet <corbet@....net>,
        the arch/x86 maintainers <x86@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, Baoquan He <bhe@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        kexec mailing list <kexec@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "# v4 . 16+" <stable@...r.kernel.org>,
        Li Yang <leoyang.li@....com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Diego Elio Pettenò <flameeyes@...meeyes.com>,
        Olof Johansson <olof@...om.net>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH 1/1] kernel/crash_core.c - Add crashkernel=auto for x86
 and ARM

On 01/22/21 at 09:22am, Dave Young wrote:
> Hi John,
> 
> On 01/21/21 at 09:32am, john.p.donnelly@...cle.com wrote:
> > On 11/22/20 9:47 PM, Dave Young wrote:
> > > Hi Guilherme,
> > > On 11/22/20 at 12:32pm, Guilherme Piccoli wrote:
> > > > Hi Dave and Kairui, thanks for your responses! OK, if that makes sense
> > > > to you I'm fine with it. I'd just recommend to test recent kernels in
> > > > multiple distros with the minimum "range" to see if 64M is enough for
> > > > crashkernel, maybe we'd need to bump that.
> > > 
> > > Giving the different kernel configs and the different userspace
> > > initramfs setup it is hard to get an uniform value for all distributions,
> > > but we can have an interface/kconfig-option for them to provide a value like this patch
> > > is doing. And it could be improved like Kairui said about some known
> > > kernel added extra values later, probably some more improvements if
> > > doable.
> > > 
> > > Thanks
> > > Dave
> > > 
> > 
> > Hi.
> > 
> > Are we going to move forward with implementing this for X86 and Arm ?
> > 
> > If other platform maintainers want to include this CONFIG option in their
> > configuration settings they have a starting point.
> 
> I would expect this become arch independent.

Clarify a bit, it can be a general config option under arch/Kconfig and
just put the code in general arch independent part.

> 
> Saeed, Kairui, would any of you like to update the patch?
> 
> > 
> > Thank you,
> > 
> > John.
> > 
> > ( I am not currently on many of the included dist lists  in this email, so
> > hopefully key contributors are included in this exchange )
> > 
> 
> Thanks
> Dave