From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Mike Rapoport <rppt@kernel.org>, Breno Leitao <leitao@debian.org>
Cc: Ard Biesheuvel <ardb@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Oscar Salvador <osalvador@suse.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Danilo Krummrich <dakr@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
kas@kernel.org, kexec@lists.infradead.org,
Brendan Jackman <brendan.jackman@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
shakeel.butt@linux.dev, linux-efi@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-cxl@vger.kernel.org, driver-core@lists.linux.dev,
linux-arm-kernel@lists.infradead.org, rmikey@meta.com,
riel@surriel.com, harry@kernel.org, kernel-team@meta.com
Subject: Re: [PATCH v6 4/7] mm/memblock: add a reserved-region flag for poisoned frames
Date: Wed, 28 Oct 2026 09:39:42 +0100 [thread overview]
Message-ID: <524ee7d9-790d-48b6-8613-841da042c32a@kernel.org> (raw)
In-Reply-To: <ato62palTbNjLwN7@kernel.org>
On 10/22/26 18:33, Mike Rapoport wrote:
> Hi Breno,
>
> On Fri, Oct 16, 2026 at 05:15:44AM -0700, Breno Leitao wrote:
>> memblock allocates from and frees to buddy whatever is not reserved, and
>> knows nothing about frames an earlier kernel found hardware-poisoned.
>> Such a frame can back the memmap, a page table or a percpu area before
>> any hwpoison code runs, and otherwise reaches the buddy allocator like
>> any other free frame.
>>
>> Add MEMBLOCK_RSRV_HWPOISON for a reserved range holding those frames.
>
> How much this would fragment memblock.reserved?
>
> memblock is not very scalable, to say the least, and each new flag
> increases the size of memblock arrays which obviously hurts performance.
I assume that if you have too many regions there, you have different problems
than scalability problems.
We should cut out larger chunks, and if they are all over your address space you
should scrap that machine.
--
Cheers,
David
next prev parent reply other threads:[~2026-10-28 8:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-16 12:15 [PATCH v6 0/7] mm/memory-failure: keep hardware-poisoned pages out of the next kexec Breno Leitao
2026-10-16 12:15 ` [PATCH v6 1/7] mm/memory-failure: efi: add the LINUX_EFI_POISONED_MEMORY configuration table Breno Leitao
2026-10-16 12:15 ` [PATCH v6 2/7] mm/memory-failure: libstub: install the poisoned-memory EFI table Breno Leitao
2026-10-16 12:15 ` [PATCH v6 3/7] mm/memory-failure: add hwpoison_boot_page() to flag an inherited frame Breno Leitao
2026-10-16 12:15 ` [PATCH v6 4/7] mm/memblock: add a reserved-region flag for poisoned frames Breno Leitao
2026-10-22 16:33 ` Mike Rapoport
2026-10-28 8:39 ` David Hildenbrand (Arm) [this message]
2026-10-28 13:49 ` Breno Leitao
2026-10-28 17:13 ` Mike Rapoport
2026-10-16 12:15 ` [PATCH v6 5/7] drivers/base/memory: count the poison a block already holds when creating it Breno Leitao
2026-10-16 12:15 ` [PATCH v6 6/7] mm/memory-failure: efi: reserve the inherited poisoned-memory units Breno Leitao
2026-10-16 12:15 ` [PATCH v6 7/7] mm/memory-failure: efi: record hardware-poisoned frames into the poisoned-memory table Breno Leitao
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