linux-kernel - Re: [PATCH 0/2] Fix subsection vmemmap

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Message-ID: <b2681eed-d4d5-43c9-90e0-3e706db3e201@quicinc.com>
Date: Fri, 6 Dec 2024 17:13:39 +0800
From: Zhenhua Huang <quic_zhenhuah@...cinc.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <ardb@...nel.org>,
        <ryan.roberts@....com>, <mark.rutland@....com>, <joey.gouly@....com>,
        <dave.hansen@...ux.intel.com>, <akpm@...ux-foundation.org>,
        <chenfeiyang@...ngson.cn>, <chenhuacai@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Fix subsection vmemmap_populate logic



On 2024/11/28 15:26, Zhenhua Huang wrote:
> 
> 
> On 2024/11/21 15:12, Zhenhua Huang wrote:
>> To perform memory hotplug operations, the memmap (aka struct page) 
>> will be
>> updated. For arm64 with 4K page size, the typical granularity is 128M,
>> which corresponds to a 2M memmap buffer.
>> Commit 2045a3b8911b ("mm/sparse-vmemmap: generalise 
>> vmemmap_populate_hugepages()")
>> optimizes this 2M buffer to be mapped with PMD huge pages. However,
>> commit ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
>> which supports 2M subsection hotplug granularity, causes other issues
>> (refer to the change log of patch #1). The logic is adjusted to populate
>> with huge pages only if the hotplug address/size is section-aligned.
> 
> Could any expert please help review ?

Gentle reminder for review..

> 
>>
>> Zhenhua Huang (2):
>>    arm64: mm: vmemmap populate to page level if not section aligned
>>    arm64: mm: implement vmemmap_check_pmd for arm64
>>
>>   arch/arm64/mm/mmu.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>