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Subject: Re: [PATCH v7 0/4] support reserving crashkernel above 4G on arm64
 kdump
From:   John Donnelly <john.p.donnelly@oracle.com>
In-Reply-To: <CAK8P3a2VrAqefPYF2JqRjwdhgTDtORUgWgVuYxRYWqKxE3+5pA@mail.gmail.com>
Date:   Tue, 19 May 2020 15:21:58 -0500
Cc:     Chen Zhou <chenzhou10@huawei.com>,
        Simon Horman <horms@verge.net.au>,
        Will Deacon <will@kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Bhupesh Sharma <bhsharma@redhat.com>,
        kexec mailing list <kexec@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        James Morse <james.morse@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Prabhakar Kushwaha <pkushwaha@marvell.com>,
        Dave Young <dyoung@redhat.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        John Donnelly <john.p.donnelly@oracle.com>
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Message-Id: <3D37F6BE-ECFC-4EC0-A7C4-341F85FC056E@oracle.com>
References: <20191223152349.180172-1-chenzhou10@huawei.com>
 <a57d46bc-881e-3526-91ca-558bf64e2aa8@huawei.com>
 <CAK8P3a2VrAqefPYF2JqRjwdhgTDtORUgWgVuYxRYWqKxE3+5pA@mail.gmail.com>
To:     Arnd Bergmann <arnd@arndb.de>
Sender: linux-kernel-owner@vger.kernel.org
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> On May 19, 2020, at 5:21 AM, Arnd Bergmann <arnd@arndb.de> wrote:
>=20
> On Thu, Mar 26, 2020 at 4:10 AM Chen Zhou <chenzhou10@huawei.com> =
wrote:
>>=20
>> Hi all,
>>=20
>> Friendly ping...
>=20
> I was asked about this patch series, and see that you last posted it =
in
> December. I think you should rebase it to linux-5.7-rc6 and post the
> entire series again to make progress, as it's unlikely that any =
maintainer
> would pick up the patches from last year.
>=20
> For the contents, everything seems reasonable to me, but I noticed =
that
> you are adding a property to the /chosen node without adding the
> corresponding documentation to
> Documentation/devicetree/bindings/chosen.txt
>=20
> Please add that, and Cc the devicetree maintainers on the updated
> patch.
>=20
>         Arnd
>=20
>> On 2019/12/23 23:23, Chen Zhou wrote:
>>> This patch series enable reserving crashkernel above 4G in arm64.
>>>=20
>>> There are following issues in arm64 kdump:
>>> 1. We use crashkernel=3DX to reserve crashkernel below 4G, which =
will fail
>>> when there is no enough low memory.
>>> 2. Currently, crashkernel=3DY@X can be used to reserve crashkernel =
above 4G,
>>> in this case, if swiotlb or DMA buffers are required, crash dump =
kernel
>>> will boot failure because there is no low memory available for =
allocation.
>>>=20
>>> The previous changes and discussions can be retrieved from:
>>>=20
>>> Changes since [v6]
>>> - Fix build errors reported by kbuild test robot.
> ...


 Hi=20

We found=20

https://lkml.org/lkml/2020/4/30/1583

Has cured our Out-Of-Memory kdump failures.=20

From	Henry Willard=20
Subject	[PATCH] mm: Limit boost_watermark on small zones.

I am currently not on linux-kernel@vger.kernel.org. dlist for all to see =
 this message so you may want to rebase and see if this cures your OoM =
issue and share the results.=20