From: Pedro Falcato <pfalcato@suse.de>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>, Zi Yan <ziy@nvidia.com>,
"Liam R. Howlett" <liam@infradead.org>,
Lorenzo Stoakes <ljs@kernel.org>,
Vlastimil Babka <vbabka@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
linux-mm@kvack.org
Subject: Re: [PATCH v2 4/4] mm: migrate_device: use walk_page_range_vma() in migrate_vma_collect()
Date: Thu, 18 Jun 2026 12:53:53 +0100 [thread overview]
Message-ID: <ajPcPPyXecvXee6h@pedro-suse> (raw)
In-Reply-To: <20260618092845.3905740-5-wangkefeng.wang@huawei.com>
On Thu, Jun 18, 2026 at 05:28:45PM +0800, Kefeng Wang wrote:
> The migrate_vma_collect() uses walk_page_range() to walk the page
> table. Fortunately, migrate_vma_setup() already validates that the
> entire range falls within a single VMA.
>
> Since there is no .test_walk in migrate_vma_walk_ops and VM_PFNMAP
> was filtered by migrate_vma_setup(), it's safe to replace
> walk_page_range() with walk_page_range_vma() to eliminate an
> unnecessary find_vma() lookup.
>
> Reviewed-by: Zi Yan <ziy@nvidia.com>
> Acked-by: David Hildenbrand (Arm) <david@kernel.org>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
--
Pedro
prev parent reply other threads:[~2026-06-18 11:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-18 9:28 [PATCH v2 0/4] mm: convert to walk_page_range_vma() to eliminate find_vma() Kefeng Wang
2026-06-18 9:28 ` [PATCH v2 1/4] mm: mincore: use walk_page_range_vma() in do_mincore() Kefeng Wang
2026-06-18 11:34 ` David Hildenbrand (Arm)
2026-06-18 11:49 ` Pedro Falcato
2026-06-18 12:58 ` David Hildenbrand (Arm)
2026-06-18 13:01 ` Kefeng Wang
2026-06-18 15:02 ` Pedro Falcato
2026-06-18 9:28 ` [PATCH v2 2/4] mm: mprotect: use walk_page_range_vma() in mprotect_fixup() Kefeng Wang
2026-06-18 11:52 ` Pedro Falcato
2026-06-18 9:28 ` [PATCH v2 3/4] mm: mlock: use walk_page_range_vma() in mlock_vma_pages_range() Kefeng Wang
2026-06-18 11:53 ` Pedro Falcato
2026-06-18 9:28 ` [PATCH v2 4/4] mm: migrate_device: use walk_page_range_vma() in migrate_vma_collect() Kefeng Wang
2026-06-18 11:53 ` Pedro Falcato [this message]
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