From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Dev Jain <dev.jain@arm.com>, akpm@linux-foundation.org, ljs@kernel.org
Cc: kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev,
baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com,
weixugc@google.com, liam@infradead.org, vbabka@kernel.org,
rppt@kernel.org, surenb@google.com, mhocko@suse.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
riel@surriel.com, harry@kernel.org, jannh@google.com,
lance.yang@linux.dev, ryan.roberts@arm.com,
anshuman.khandual@arm.com
Subject: Re: [PATCH v2 2/3] mm/memory: batch set uffd-wp markers during zapping
Date: Mon, 20 Jul 2026 09:20:11 +0100 [thread overview]
Message-ID: <5dbd012e-52cd-40cf-b9af-59787e2832b8@kernel.org> (raw)
In-Reply-To: <20260720065508.2695106-3-dev.jain@arm.com>
On 7/20/26 07:55, Dev Jain wrote:
> Enable batch setting of uffd-wp PTE markers.
>
> The code paths passing nr > 1 to zap_install_uffd_wp_if_needed() produce
> that nr through either folio_pte_batch() or swap_pte_batch(), therefore
> batching is correct:
>
> 1) All PTEs belong to the same type of VMA: anonymous or non-anonymous,
> wp-armed or non-wp-armed.
>
> 2) All PTEs are either marked with uffd-wp or not marked with uffd-wp;
> the same applies to the pte_swp_uffd_any() check.
>
> 3) uffd_supports_wp_marker() is independent of the function parameters.
>
> Use set_pte_at() in a loop instead of set_ptes(), because set_ptes()
> cannot handle nonpresent to nonpresent conversion for nr_pages > 1.
>
> Rename the helper to cond_install_uffd_wp_ptes().
>
> Signed-off-by: Dev Jain <dev.jain@arm.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-07-20 8:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 6:55 [PATCH v2 0/3] Batch unmap of uffd-wp file folios Dev Jain
2026-07-20 6:55 ` [PATCH v2 1/3] mm/memory: move pte_install_uffd_wp_if_needed() into memory.c Dev Jain
2026-07-20 8:19 ` David Hildenbrand (Arm)
2026-07-20 6:55 ` [PATCH v2 2/3] mm/memory: batch set uffd-wp markers during zapping Dev Jain
2026-07-20 8:20 ` David Hildenbrand (Arm) [this message]
2026-07-20 6:55 ` [PATCH v2 3/3] mm/rmap: batch unmap file folios belonging to uffd-wp VMAs Dev Jain
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