From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, <ziy@nvidia.com>,
<linux-mm@kvack.org>
Subject: Re: [PATCH] mm: memory: use nth_page() in clear/copy_subpage()
Date: Tue, 2 Jan 2024 14:53:21 +0800 [thread overview]
Message-ID: <9bb17dcd-4651-41d2-9982-4632147a82f8@huawei.com> (raw)
In-Reply-To: <ff4e0024-c256-46e9-a203-ad62c21896f7@redhat.com>
On 2023/12/29 19:15, David Hildenbrand wrote:
> On 29.12.23 09:49, Matthew Wilcox wrote:
>> On Fri, Dec 29, 2023 at 04:22:07PM +0800, Kefeng Wang wrote:
>>> The clear and copy of huge gigantic page has converted to use nth_page()
>>> to handle the possible discontinuous struct page(SPARSEMEM without
>>> VMEMMAP),
>>> but not change for the non-gigantic part, fix it too.
>>
>> Can there be discontiguities within a non-gigantic huge page? My
>> impression was that you can't have a discontiguity at such a small
>> boundary.
>
> No, we can't. MAX_ORDER allocations from the buddy always completely fit
> into a memory section.
On ARM64, we have 32M(16*2M) HugeTLB, it maybe not within a mem section,
right?
But after v5.13 commit 782276b4d0ad ("arm64: Force SPARSEMEM_VMEMMAP
as the only memory management model"), it looks only old lts, eg, 5.10
could meet this issue.
next prev parent reply other threads:[~2024-01-02 6:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-29 8:22 Kefeng Wang
2023-12-29 8:49 ` Matthew Wilcox
2023-12-29 11:15 ` David Hildenbrand
2024-01-02 6:53 ` Kefeng Wang [this message]
2024-01-02 16:11 ` David Hildenbrand
2024-01-03 6:23 ` Kefeng Wang
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