From: Hugh Dickins <hughd@google.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,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH mm-new 1/3] mm/khugepaged: skip unsuitable VMAs earlier in khugepaged_scan_mm_slot()
Date: Mon, 15 Sep 2025 22:32:14 -0700 (PDT) [thread overview]
Message-ID: <bc86d5f7-5b23-14fb-0365-b47f5a6f13c9@google.com> (raw)
In-Reply-To: <20250914143547.27687-2-lance.yang@linux.dev>
On Sun, 14 Sep 2025, Lance Yang wrote:
> From: Lance Yang <lance.yang@linux.dev>
>
> Let's skip unsuitable VMAs early in the khugepaged scan; specifically,
> mlocked VMAs should not be touched.
Why? That's a change in behaviour, isn't it?
I'm aware that hugepage collapse on an mlocked VMA can insert a fault
latency, not universally welcome; but I've not seen discussion, let
alone agreement, that current behaviour should be changed.
Somewhere in yet-to-be-read mail? Please give us a link.
Hugh
next prev parent reply other threads:[~2025-09-16 5:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-14 14:35 [PATCH mm-new 0/3] mm/khugepaged: optimize collapse candidate detection Lance Yang
2025-09-14 14:35 ` [PATCH mm-new 1/3] mm/khugepaged: skip unsuitable VMAs earlier in khugepaged_scan_mm_slot() Lance Yang
2025-09-14 16:16 ` Dev Jain
2025-09-15 3:02 ` Lance Yang
2025-09-16 5:32 ` Hugh Dickins [this message]
2025-09-16 6:21 ` Lance Yang
2025-09-16 6:42 ` Hugh Dickins
2025-09-16 7:05 ` Lance Yang
2025-09-16 9:29 ` Kiryl Shutsemau
2025-09-16 9:39 ` Lorenzo Stoakes
2025-09-16 9:48 ` Kiryl Shutsemau
2025-09-16 9:58 ` Lorenzo Stoakes
2025-09-16 10:00 ` Lance Yang
2025-09-16 9:59 ` Lance Yang
2025-09-14 14:35 ` [PATCH mm-new 2/3] mm: clean up and expose is_guard_pte_marker() Lance Yang
2025-09-14 16:38 ` Dev Jain
2025-09-15 4:24 ` Lance Yang
2025-09-15 13:54 ` Lorenzo Stoakes
2025-09-15 14:26 ` Lance Yang
2025-09-17 10:32 ` David Hildenbrand
2025-09-14 14:35 ` [PATCH mm-new 3/3] mm/khugepaged: abort collapse scan on guard PTEs Lance Yang
2025-09-14 17:03 ` Dev Jain
2025-09-15 3:36 ` Lance Yang
2025-09-15 14:08 ` Lorenzo Stoakes
2025-09-15 14:42 ` Lance Yang
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