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Message-ID: <43d991e4-d0b0-1dd9-47ae-761746c20ab0@huawei.com>
Date: Tue, 28 Jun 2022 09:58:02 +0800
From: "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
<x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
Eric Biederman <ebiederm@...ssion.com>,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>,
<devicetree@...r.kernel.org>, Dave Young <dyoung@...hat.com>,
Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
<kexec@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Jonathan Corbet <corbet@....net>, <linux-doc@...r.kernel.org>
CC: Randy Dunlap <rdunlap@...radead.org>,
Feng Zhou <zhoufeng.zf@...edance.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
"Chen Zhou" <dingguo.cz@...group.com>,
John Donnelly <John.p.donnelly@...cle.com>,
Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: Re: [PATCH v2 0/3] arm64: kdump: Function supplement and performance
optimization
On 2022/6/21 20:42, Zhen Lei wrote:
> v1 --> v2:
> 1. Update the commit message of Patch 1, explicitly indicates that "crashkernel=X,high"
> is specified but "crashkernel=Y,low" is not specified.
> 2. Drop Patch 4-5. Currently, focus on function integrity, performance optimization
> will be considered in later versions.
> 3. Patch 3 is not mandatory, it's just a cleanup now, although it is a must for patch 4-5.
> But to avoid subsequent duplication of effort, I'm glad it was accepted.
Hi Catalin:
Do you have time to review Patch 1-2? Please ignore Patch 3, because now someone has
proposed the following new approach:
https://lore.kernel.org/linux-mm/1656241815-28494-1-git-send-email-guanghuifeng@linux.alibaba.com/T/
>
>
> v1:
> After the basic functions of "support reserving crashkernel above 4G on arm64
> kdump"(see https://lkml.org/lkml/2022/5/6/428) are implemented, we still have
> three features to be improved.
> 1. When crashkernel=X,high is specified but crashkernel=Y,low is not specified,
> the default crash low memory size is provided.
> 2. For crashkernel=X without '@...set', if the low memory fails to be allocated,
> fall back to reserve region from high memory(above DMA zones).
> 3. If crashkernel=X,high is used, page mapping is performed only for the crash
> high memory, and block mapping is still used for other linear address spaces.
> Compared to the previous version:
> (1) For crashkernel=X[@offset], the memory above 4G is not changed to block
> mapping, leave it to the next time.
> (2) The implementation method is modified. Now the implementation is simpler
> and clearer.
>
> Zhen Lei (3):
> arm64: kdump: Provide default size when crashkernel=Y,low is not
> specified
> arm64: kdump: Support crashkernel=X fall back to reserve region above
> DMA zones
> arm64: kdump: Remove some redundant checks in map_mem()
>
> .../admin-guide/kernel-parameters.txt | 10 ++-----
> arch/arm64/mm/init.c | 28 +++++++++++++++++--
> arch/arm64/mm/mmu.c | 25 ++++++++---------
> 3 files changed, 39 insertions(+), 24 deletions(-)
>
--
Regards,
Zhen Lei
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