From: Catalin Marinas <catalin.marinas@arm•com>
To: Jinjie Ruan <ruanjinjie@huawei•com>
Cc: corbet@lwn•net, skhan@linuxfoundation•org, will@kernel•org,
chenhuacai@kernel•org, kernel@xen0n•name, maddy@linux•ibm.com,
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Subject: Re: [PATCH v10 6/8] arm64: kexec: Add support for crashkernel CMA reservation
Date: Thu, 26 Mar 2026 10:54:01 +0000 [thread overview]
Message-ID: <acUQSSNgxCCK5LnI@arm.com> (raw)
In-Reply-To: <20260325025904.2811960-7-ruanjinjie@huawei.com>
On Wed, Mar 25, 2026 at 10:59:02AM +0800, Jinjie Ruan wrote:
> Commit 35c18f2933c5 ("Add a new optional ",cma" suffix to the
> crashkernel= command line option") and commit ab475510e042 ("kdump:
> implement reserve_crashkernel_cma") added CMA support for kdump
> crashkernel reservation.
>
> Crash kernel memory reservation wastes production resources if too
> large, risks kdump failure if too small, and faces allocation difficulties
> on fragmented systems due to contiguous block constraints. The new
> CMA-based crashkernel reservation scheme splits the "large fixed
> reservation" into a "small fixed region + large CMA dynamic region": the
> CMA memory is available to userspace during normal operation to avoid
> waste, and is reclaimed for kdump upon crash—saving memory while
> improving reliability.
>
> So extend crashkernel CMA reservation support to arm64. The following
> changes are made to enable CMA reservation:
>
> - Parse and obtain the CMA reservation size along with other crashkernel
> parameters.
> - Call reserve_crashkernel_cma() to allocate the CMA region for kdump.
> - Include the CMA-reserved ranges for kdump kernel to use.
> - Exclude the CMA-reserved ranges from the crash kernel memory to
> prevent them from being exported through /proc/vmcore, which is already
> done in the crash core.
>
> Update kernel-parameters.txt to document CMA support for crashkernel on
> arm64 architecture.
>
> Acked-by: Rob Herring (Arm) <robh@kernel•org>
> Acked-by: Baoquan He <bhe@redhat•com>
> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel•org>
> Acked-by: Ard Biesheuvel <ardb@kernel•org>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei•com>
Acked-by: Catalin Marinas <catalin.marinas@arm•com>
next prev parent reply other threads:[~2026-03-26 10:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 2:58 [PATCH v10 0/8] arm64/riscv: Add support for crashkernel CMA reservation Jinjie Ruan
2026-03-25 2:58 ` [PATCH v10 1/8] riscv: kexec_file: Fix crashk_low_res not exclude bug Jinjie Ruan
2026-03-25 2:58 ` [PATCH v10 2/8] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr() Jinjie Ruan
2026-03-25 2:58 ` [PATCH v10 3/8] powerpc/crash: sort crash memory ranges before preparing elfcorehdr Jinjie Ruan
2026-03-25 2:59 ` [PATCH v10 4/8] crash: Exclude crash kernel memory in crash core Jinjie Ruan
2026-03-26 10:53 ` Catalin Marinas
2026-03-25 2:59 ` [PATCH v10 5/8] crash: Use crash_exclude_core_ranges() on powerpc Jinjie Ruan
2026-03-25 2:59 ` [PATCH v10 6/8] arm64: kexec: Add support for crashkernel CMA reservation Jinjie Ruan
2026-03-26 10:54 ` Catalin Marinas [this message]
2026-03-25 2:59 ` [PATCH v10 7/8] riscv: " Jinjie Ruan
2026-03-25 2:59 ` [PATCH v10 8/8] crash: Fix race condition between crash kernel loading and memory hotplug Jinjie Ruan
2026-03-26 4:00 ` [PATCH v10 0/8] arm64/riscv: Add support for crashkernel CMA reservation Andrew Morton
2026-03-26 13:09 ` Jinjie Ruan
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