From: Barry Song <21cnbao@gmail.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: akpm@linux-foundation.org, david@kernel.org,
catalin.marinas@arm.com, will@kernel.org,
lorenzo.stoakes@oracle.com, ryan.roberts@arm.com,
Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org,
surenb@google.com, mhocko@suse.com, riel@surriel.com,
harry.yoo@oracle.com, jannh@google.com, willy@infradead.org,
linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/3] mm: rmap: support batched unmapping for file large folios
Date: Thu, 11 Dec 2025 20:36:51 +0800 [thread overview]
Message-ID: <CAGsJ_4yVCbP9EJ2KZu-83PL-LViB+zn3NPC5E61LKf+nWWNsWw@mail.gmail.com> (raw)
In-Reply-To: <af330c9ea188bd0f28189b1e6e5803f6de9d2abe.1765439381.git.baolin.wang@linux.alibaba.com>
On Thu, Dec 11, 2025 at 4:17 PM Baolin Wang
<baolin.wang@linux.alibaba.com> wrote:
>
> Similar to folio_referenced_one(), we can apply batched unmapping for file
> large folios to optimize the performance of file folios reclamation.
>
> Performance testing:
> Allocate 10G clean file-backed folios by mmap() in a memory cgroup, and try to
> reclaim 8G file-backed folios via the memory.reclaim interface. I can observe
> 75% performance improvement on my Arm64 32-core server.
>
> W/o patch:
> real 0m1.018s
> user 0m0.000s
> sys 0m1.018s
>
> W/ patch:
> real 0m0.249s
> user 0m0.000s
> sys 0m0.249s
>
> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
It appears quite straightforward to introduce file folios support based on the
current lazyfree implementation.
Acked-by: Barry Song <baohua@kernel.org>
prev parent reply other threads:[~2025-12-11 12:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-11 8:16 [PATCH v2 0/3] support batch checking of references and unmapping for large folios Baolin Wang
2025-12-11 8:16 ` [PATCH v2 1/3] arm64: mm: support batch clearing of the young flag " Baolin Wang
2025-12-11 8:16 ` [PATCH v2 2/3] mm: rmap: support batched checks of the references " Baolin Wang
2025-12-11 8:16 ` [PATCH v2 3/3] mm: rmap: support batched unmapping for file " Baolin Wang
2025-12-11 12:36 ` Barry Song [this message]
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