From: Wei Yang <richard.weiyang@gmail.com>
To: Lance Yang <lance.yang@linux.dev>
Cc: akpm@linux-foundation.org, david@redhat.com,
lorenzo.stoakes@oracle.com, ziy@nvidia.com,
baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com,
npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com,
baohua@kernel.org, ioworker0@gmail.com,
richard.weiyang@gmail.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH mm-new 1/2] mm/khugepaged: optimize PTE scanning with if-else-if-else-if chain
Date: Fri, 3 Oct 2025 13:21:18 +0000 [thread overview]
Message-ID: <20251003132118.qe2wipbrzwkbaatq@master> (raw)
In-Reply-To: <20251002073255.14867-2-lance.yang@linux.dev>
On Thu, Oct 02, 2025 at 03:32:54PM +0800, Lance Yang wrote:
>From: Lance Yang <lance.yang@linux.dev>
>
>As pointed out by Dev, the PTE checks for disjoint conditions in the
>scanning loops can be optimized. is_swap_pte, (pte_none && is_zero_pfn),
>and pte_uffd_wp are mutually exclusive.
>
>This patch refactors the loops in both __collapse_huge_page_isolate() and
>hpage_collapse_scan_pmd() to use a continuous if-else-if-else-if chain
>instead of separate if blocks.
>
>Also, this is a preparatory step to make it easier to merge the
>almost-duplicated scanning logic in these two functions, as suggested
>by David.
>
>Suggested-by: Dev Jain <dev.jain@arm.com>
>Suggested-by: David Hildenbrand <david@redhat.com>
>Signed-off-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
--
Wei Yang
Help you, Help me
next prev parent reply other threads:[~2025-10-03 13:21 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-02 7:32 [PATCH mm-new 0/2] mm/khugepaged: refactor and merge PTE scanning logic Lance Yang
2025-10-02 7:32 ` [PATCH mm-new 1/2] mm/khugepaged: optimize PTE scanning with if-else-if-else-if chain Lance Yang
2025-10-03 13:21 ` Wei Yang [this message]
2025-10-03 16:33 ` Dev Jain
2025-10-04 3:08 ` Lance Yang
2025-10-03 17:04 ` Zi Yan
2025-10-02 7:32 ` [PATCH mm-new 2/2] mm/khugepaged: merge PTE scanning logic into a new helper Lance Yang
2025-10-03 17:05 ` Dev Jain
2025-10-04 3:03 ` Lance Yang
2025-10-04 4:42 ` Dev Jain
2025-10-04 5:24 ` Lance Yang
2025-10-04 9:42 ` Wei Yang
2025-10-04 13:11 ` Dev Jain
2025-10-05 2:35 ` Lance Yang
2025-10-05 2:38 ` Zi Yan
2025-10-05 2:44 ` Lance Yang
2025-10-03 17:11 ` Zi Yan
2025-10-04 3:06 ` Lance Yang
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