From: chenzhou <chenzhou10@huawei.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: wangkefeng.wang@huawei.com, linux-doc@vger.kernel.org,
bhsharma@redhat.com, huawei.libin@huawei.com,
guohanjun@huawei.com, will@kernel.org, bhe@redhat.com,
corbet@lwn.net, mingo@redhat.com, dyoung@redhat.com,
John.P.donnelly@oracle.com, arnd@arndb.de, xiexiuqi@huawei.com,
horms@verge.net.au, tglx@linutronix.de,
linux-arm-kernel@lists.infradead.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, robh+dt@kernel.org,
james.morse@arm.com, prabhakar.pkin@gmail.com,
nsaenzjulienne@suse.de
Subject: Re: [PATCH v11 5/5] kdump: update Documentation about crashkernel
Date: Thu, 3 Sep 2020 19:56:09 +0800 [thread overview]
Message-ID: <84bb1cbb-c19e-9006-07b5-044eac5ecd4f@huawei.com> (raw)
In-Reply-To: <20200902171341.GC16673@gaia>
On 2020/9/3 1:13, Catalin Marinas wrote:
> On Sat, Aug 01, 2020 at 09:08:56PM +0800, Chen Zhou wrote:
>> diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
>> index 2da65fef2a1c..4b58f97351d5 100644
>> --- a/Documentation/admin-guide/kdump/kdump.rst
>> +++ b/Documentation/admin-guide/kdump/kdump.rst
>> @@ -299,7 +299,15 @@ Boot into System Kernel
>> "crashkernel=64M@16M" tells the system kernel to reserve 64 MB of memory
>> starting at physical address 0x01000000 (16MB) for the dump-capture kernel.
>>
>> - On x86 and x86_64, use "crashkernel=64M@16M".
>> + On x86 use "crashkernel=64M@16M".
>> +
>> + On x86_64, use "crashkernel=X" to select a region under 4G first, and
>> + fall back to reserve region above 4G.
>> + We can also use "crashkernel=X,high" to select a region above 4G, which
>> + also tries to allocate at least 256M below 4G automatically and
>> + "crashkernel=Y,low" can be used to allocate specified size low memory.
>> + Use "crashkernel=Y@X" if you really have to reserve memory from specified
>> + start address X.
>>
>> On ppc64, use "crashkernel=128M@32M".
>>
>> @@ -316,8 +324,15 @@ Boot into System Kernel
>> kernel will automatically locate the crash kernel image within the
>> first 512MB of RAM if X is not given.
>>
>> - On arm64, use "crashkernel=Y[@X]". Note that the start address of
>> - the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000).
>> + On arm64, use "crashkernel=X" to try low allocation in ZONE_DMA, and
>> + fall back to high allocation if it fails. And go for high allocation
>> + directly if the required size is too large. If crash_base is outside
> I wouldn't mention crash_base in the admin guide. That's an
> implementation detail really and admins are not supposed to read the
> source code to make sense of the documentation. ZONE_DMA is also a
> kernel internal, so you'd need to define what it is for arm64. At least
> the DMA and DMA32 zones are printed during kernel boot.
Ok, i will fix this in next version.
>
>> + ZONE_DMA, try to allocate at least 256M in ZONE_DMA automatically.
>> + "crashkernel=Y,low" can be used to allocate specified size low memory.
>> + For non-RPi4 platforms, change ZONE_DMA memtioned above to ZONE_DMA32.
>> + Use "crashkernel=Y@X" if you really have to reserve memory from
>> + specified start address X. Note that the start address of the kernel,
>> + X if explicitly specified, must be aligned to 2MiB (0x200000).
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next prev parent reply other threads:[~2020-09-03 11:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-01 13:08 [PATCH v11 0/5] support reserving crashkernel above 4G on arm64 kdump Chen Zhou
2020-08-01 13:08 ` [PATCH v11 1/5] arm64: kdump: add macro CRASH_ALIGN and CRASH_ADDR_LOW_MAX Chen Zhou
2020-08-01 13:08 ` [PATCH v11 2/5] x86: kdump: move reserve_crashkernel_low() into crash_core.c Chen Zhou
2020-08-06 13:36 ` Ingo Molnar
2020-09-01 16:50 ` Catalin Marinas
2020-08-08 9:59 ` Dave Young
2020-08-01 13:08 ` [PATCH v11 3/5] arm64: kdump: reimplement crashkernel=X Chen Zhou
2020-09-02 17:09 ` Catalin Marinas
2020-09-03 11:26 ` chenzhou
2020-09-03 13:18 ` chenzhou
2020-09-04 3:04 ` Dave Young
2020-09-04 3:10 ` Dave Young
2020-09-04 4:02 ` chenzhou
2020-09-04 4:16 ` Dave Young
2020-09-04 6:39 ` chenzhou
2020-08-01 13:08 ` [PATCH v11 4/5] arm64: kdump: add memory for devices by DT property linux, usable-memory-range Chen Zhou
2020-08-01 13:08 ` [PATCH v11 5/5] kdump: update Documentation about crashkernel Chen Zhou
2020-08-08 10:02 ` Dave Young
2020-08-10 3:28 ` chenzhou
2020-08-10 5:59 ` Dave Young
2020-08-10 6:03 ` Dave Young
2020-08-18 7:07 ` chenzhou
2020-08-19 12:03 ` Dave Young
2020-08-28 1:59 ` chenzhou
2020-09-01 17:13 ` Catalin Marinas
2020-09-02 16:42 ` Catalin Marinas
2020-09-02 17:13 ` Catalin Marinas
2020-09-03 11:56 ` chenzhou [this message]
2020-08-06 11:37 ` [PATCH v11 0/5] support reserving crashkernel above 4G on arm64 kdump Dave Young
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