From: AKASHI Takahiro <takahiro.akashi@linaro.org>
To: Dave Young <dyoung@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Matt Fleming <matt@codeblueprint.co.uk>,
Bhupesh Sharma <bhsharma@redhat.com>,
kexec@lists.infradead.org, James Morse <james.morse@arm.com>,
Bhupesh SHARMA <bhupesh.linux@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: arm64 crashkernel fails to boot on acpi-only machines due to ACPI regions being no longer mapped as NOMAP
Date: Tue, 9 Jan 2018 14:02:18 +0900 [thread overview]
Message-ID: <20180109050216.GB18820@linaro.org> (raw)
In-Reply-To: <20171226065636.GA5354@dhcp-128-65.nay.redhat.com>
On Tue, Dec 26, 2017 at 02:56:36PM +0800, Dave Young wrote:
> On 12/26/17 at 11:28am, AKASHI Takahiro wrote:
> > On Tue, Dec 26, 2017 at 09:35:17AM +0800, Dave Young wrote:
> > > [snip]
> > > > > > Well, we may be able to change pr_warn() to pr_warn_once() here, but
> > > > > > I hope that adding "numa=off" to kernel command line should also work.
> > > > >
> > > > > Hmm, adding "numa=off" to crashkernel bootargs works, and TBH it was
> > > > > my initial thought process as well, but I am not sure if this will
> > > > > cause any regressions on aarch64 systems which use crashdump feature.
> > > >
> > > > It should be fine since we use numa=off by default for all other arches
> > > > ie. x86, ppc64 and s390. Actually disabling numa in kdump kernel can save
> > > > mm component memory usage.
> > > >
> > >
> > > Forgot to say I means in RHEL and Fedora we use numa=off for kdump..
> >
> > Thank you for the clarification.
> > (It might be better to make numa off automatically if maxcpus == 0 (and 1?).)
>
> Hmm, I did a quick test with qemu/kvm, kdump kernel boot without numa=off
> I'm not sure why I do not see the warning messages on x86
> machines, maybe something arm64 specific?
I didn't see the messages(i.e. "potential offnode page_structs")
on arm64 qemu (with -smp 2 -numa node -numa node).
It seems that qemu doesn't generate acpi slit(inter-node distance table).
Thanks,
-Takahiro AKASHI
> >
> > -Takahiro AKASHI
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prev parent reply other threads:[~2018-01-09 4:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20171116070005.GI29552@linaro.org>
[not found] ` <CAFTCetQHmpprAVu6uYO+rc5Xi4EUVhmovbmSaU6nM1n1mAH62w@mail.gmail.com>
[not found] ` <CAKv+Gu9oda1Ee8AoXsCEw+Bjn-XF3wZA_CsxvqhjtT6_bmJ7uA@mail.gmail.com>
[not found] ` <CACi5LpOZ=WOx14gTwH5jfLozepT2Jw8JSY5x+bfEZ_YaiQvFpw@mail.gmail.com>
[not found] ` <20171213102624.GC28046@linaro.org>
[not found] ` <CAKv+Gu_BmFN9Zg861SCS+R=V4khFykjuOzkmfEknsL=NvWW3Eg@mail.gmail.com>
[not found] ` <20171213121605.GE28046@linaro.org>
[not found] ` <CAKv+Gu_G8kBEAdAznVauZVAdJOFkr1vmu0Gf6tOwJfH2CgdufA@mail.gmail.com>
[not found] ` <20171215085924.sqlcwm4copzba5ag@fireball>
[not found] ` <CAKv+Gu-W5VpVrgA=FVZCCevksaRGOVvPdE+B8WkpZc6AE1jOPw@mail.gmail.com>
[not found] ` <CACi5LpPDL0j4o3MuOZ3jRv3UOqM48yTgKtdm-hY+OWL8h-ETzQ@mail.gmail.com>
2017-12-18 5:16 ` arm64 crashkernel fails to boot on acpi-only machines due to ACPI regions being no longer mapped as NOMAP Dave Young
2017-12-18 5:54 ` AKASHI Takahiro
2017-12-18 8:59 ` Bhupesh SHARMA
2017-12-18 11:18 ` AKASHI Takahiro
2017-12-18 22:28 ` Bhupesh Sharma
2017-12-19 5:01 ` AKASHI Takahiro
2017-12-20 19:52 ` Bhupesh Sharma
2017-12-18 21:28 ` Bhupesh Sharma
2017-12-19 5:25 ` AKASHI Takahiro
[not found] ` <20171218054009.GA6392@dhcp-128-65.nay.redhat.com>
2017-12-18 5:43 ` Dave Young
[not found] ` <20171219060927.GH28046@linaro.org>
[not found] ` <CAKv+Gu-gmbWdZ7rxp5qGrtSBQ7dM=3FqF-Pw=J0LaL=oKTMg4w@mail.gmail.com>
[not found] ` <CACi5LpOscbcBecWaC3Q9P22kheRYc+M2Ynfusszk14fPY-cJ5A@mail.gmail.com>
2017-12-21 10:34 ` AKASHI Takahiro
2017-12-21 12:06 ` Bhupesh Sharma
2017-12-22 8:33 ` AKASHI Takahiro
2017-12-23 19:51 ` Bhupesh Sharma
2017-12-25 3:25 ` AKASHI Takahiro
2017-12-25 20:14 ` Bhupesh Sharma
2017-12-26 1:32 ` Dave Young
2017-12-26 1:35 ` Dave Young
2017-12-26 2:28 ` AKASHI Takahiro
2017-12-26 2:56 ` Bhupesh Sharma
2017-12-26 6:58 ` Dave Young
2018-01-09 5:22 ` AKASHI Takahiro
2018-01-08 20:00 ` Bhupesh Sharma
2018-01-09 4:42 ` AKASHI Takahiro
2018-01-09 11:46 ` Bhupesh Sharma
2017-12-26 6:56 ` Dave Young
2018-01-09 5:02 ` AKASHI Takahiro [this message]
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