From: Simon Horman <horms@kernel.org>
To: Guo Ren <guoren@kernel.org>
Cc: Chen Jiahao <chenjiahao16@huawei.com>,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
kexec@lists.infradead.org, linux-doc@vger.kernel.org,
paul.walmsley@sifive.com, palmer@dabbelt.com,
conor.dooley@microchip.com, heiko@sntech.de, bjorn@rivosinc.com,
alex@ghiti.fr, akpm@linux-foundation.org, atishp@rivosinc.com,
bhe@redhat.com, thunder.leizhen@huawei.com
Subject: Re: [PATCH -next v3 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
Date: Fri, 7 Apr 2023 14:03:52 +0200 [thread overview]
Message-ID: <ZDAGqL6CZGrL499u@kernel.org> (raw)
In-Reply-To: <CAJF2gTRtj=-XONv3cMZFd+qCtqUQqYZo5Lv7cgQbkGKTB0j7yg@mail.gmail.com>
On Fri, Apr 07, 2023 at 05:06:24PM +0800, Guo Ren wrote:
> On Thu, Apr 6, 2023 at 10:06 PM Chen Jiahao <chenjiahao16@huawei.com> wrote:
> >
> > On riscv, the current crash kernel allocation logic is trying to
> > allocate within 32bit addressible memory region by default, if
> > failed, try to allocate without 4G restriction.
> >
> > In need of saving DMA zone memory while allocating a relatively large
> > crash kernel region, allocating the reserved memory top down in
> > high memory, without overlapping the DMA zone, is a mature solution.
> > Here introduce the parameter option crashkernel=X,[high,low].
> >
> > One can reserve the crash kernel from high memory above DMA zone range
> > by explicitly passing "crashkernel=X,high"; or reserve a memory range
> > below 4G with "crashkernel=X,low".
> Asked-by: Guo Ren <guoren@kernel.org>
Perhaps 'Acked-by' :)
next prev parent reply other threads:[~2023-04-07 12:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-06 22:02 [PATCH -next v3 0/2] support allocating crashkernel above 4G explicitly on riscv Chen Jiahao
2023-04-06 22:02 ` [PATCH -next v3 1/2] riscv: kdump: Implement crashkernel=X,[high,low] Chen Jiahao
2023-04-07 9:06 ` Guo Ren
2023-04-07 12:03 ` Simon Horman [this message]
2023-04-11 1:38 ` Guo Ren
2023-04-07 12:03 ` Simon Horman
2023-04-07 12:58 ` Leizhen (ThunderTown)
2023-04-08 2:00 ` Leizhen (ThunderTown)
2023-04-10 9:52 ` chenjiahao (C)
2023-04-10 9:20 ` chenjiahao (C)
2023-04-06 22:02 ` [PATCH -next v3 2/2] docs: kdump: Update the crashkernel description for riscv Chen Jiahao
2023-04-07 8:34 ` Guo Ren
2023-04-07 12:04 ` Simon Horman
2023-04-08 2:01 ` Leizhen (ThunderTown)
2023-04-07 12:05 ` [PATCH -next v3 0/2] support allocating crashkernel above 4G explicitly on riscv Simon Horman
2023-04-10 10:02 ` chenjiahao (C)
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