From: David Hildenbrand <david@redhat.com>
To: Lance Yang <ioworker0@gmail.com>, akpm@linux-foundation.org
Cc: 21cnbao@gmail.com, ryan.roberts@arm.com, dev.jain@arm.com,
shy828301@gmail.com, ziy@nvidia.com, libang.li@antgroup.com,
baolin.wang@linux.alibaba.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Liam.Howlett@oracle.com,
lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com,
Jason@zx2c4.com, Mingzhe Yang <mingzhe.yang@ly.com>
Subject: Re: [RFC 1/1] mm/madvise: fail MADV_PAGEOUT on VM_DROPPABLE VMA
Date: Mon, 20 Jan 2025 09:03:48 +0100 [thread overview]
Message-ID: <8cc676db-14eb-442d-b41e-64132f27fa13@redhat.com> (raw)
In-Reply-To: <20250120013038.6657-1-ioworker0@gmail.com>
On 20.01.25 02:30, Lance Yang wrote:
> MADV_PAGEOUT should fail on VMAs with the VM_DROPPABLE flag. While
> MADV_PAGEOUT is intended to move anonymous pages to swap, VM_DROPPABLE
> should not be swapped out.
>
> There is an issue where using MADV_PAGEOUT on a VMA with the VM_DROPPABLE
> flag behaves like MADV_DONTNEED, causing the pages to be dropped. This
> could break the semantics of MADV_PAGEOUT, IMO.
It behaves exactly correct I think. They can be dropped any time, which
includes on misplaced MADV_PAGEOUT.
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-01-20 8:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-20 1:30 Lance Yang
2025-01-20 2:02 ` Barry Song
2025-01-20 8:03 ` David Hildenbrand [this message]
2025-01-20 10:45 ` Lorenzo Stoakes
2025-01-20 13:47 ` Lance Yang
2025-01-20 13:56 ` David Hildenbrand
2025-01-21 2:28 ` Lance Yang
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