linux-kernel - Re: [RFC V3 PATCH] arm64: mm: swap: save and restore mte tags for large folios

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Date:   Wed, 15 Nov 2023 16:16:36 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Barry Song <21cnbao@...il.com>, steven.price@....com,
        akpm@...ux-foundation.org, ryan.roberts@....com,
        catalin.marinas@....com, will@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        shy828301@...il.com, v-songbaohua@...o.com,
        wangkefeng.wang@...wei.com, willy@...radead.org, xiang@...nel.org,
        ying.huang@...el.com, yuzhao@...gle.com
Subject: Re: [RFC V3 PATCH] arm64: mm: swap: save and restore mte tags for
 large folios

On 14.11.23 02:43, Barry Song wrote:
> This patch makes MTE tags saving and restoring support large folios,
> then we don't need to split them into base pages for swapping out
> on ARM64 SoCs with MTE.
> 
> arch_prepare_to_swap() should take folio rather than page as parameter
> because we support THP swap-out as a whole.
> 
> Meanwhile, arch_swap_restore() should use page parameter rather than
> folio as swap-in always works at the granularity of base pages right
> now.

... but then we always have order-0 folios and can pass a folio, or what 
am I missing?

> 
> arch_thp_swp_supported() is dropped since ARM64 MTE was the only one
> who needed it.

Can we do that separately?

-- 
Cheers,

David / dhildenb