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b=a3UyS6ahk2trguKf8SG4/QJFZe6zvkoD9WodHhelT7yKMjUNTDpJd0fxm/guCEknI 8C6G5eoi5i0mnIK/SV8AGZuLzTobgjxKc3KnFSfwaiXnkWDrtm12G+AIByCr+p+gkp U5knNUaj82pN4HfbyJI3+78xqsA1Ugyw4C2Lk+gE= Date: Fri, 8 May 2026 16:38:42 -0700 From: Andrew Morton To: Dev Jain Cc: david@kernel.org, ljs@kernel.org, hughd@google.com, chrisl@kernel.org, kasong@tencent.com, riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, rppt@kernel.org, surenb@google.com, mhocko@suse.com, baolin.wang@linux.alibaba.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, youngjun.park@lge.com, pfalcato@suse.de, ryan.roberts@arm.com, anshuman.khandual@arm.com Subject: Re: [PATCH v3 0/9] Optimize anonymous large folio unmapping Message-Id: <20260508163842.ad2b2202f827d3f86228758d@linux-foundation.org> In-Reply-To: <20260506094504.2588857-1-dev.jain@arm.com> References: <20260506094504.2588857-1-dev.jain@arm.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: bpq8j1yizt7aj1tqj1mmdqmzoywjksq4 X-Rspamd-Queue-Id: AD46C160011 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1778283525-477135 X-HE-Meta: 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 kqa998VA Fcd/ZW6zApqHnBxbJiZHMfCYSXmNGNzyYTmTaX6kMFXiGPdr0wxN0WhXWbdDxeziwe73WwzvWUl3zK51vJ0R6acDHdoetCvBqm5UYoEWTxbRkdqJkdpxs/+xvnvbc5VN4i4B3F7CAPsek4RW9TRr3z2oD1DDbQdo/75Yh38SRCzZ+ZDXoVixSPo3Nyc3ZH0A54Q7WYDqAp1343W5kOGjobeeCXvKz2OBcbceJftyrSF4BkR4p1CZKFKnA6gjWeg6O5zBDRqpQdGM77FXIebhaN+3nceunev93IJywWrhp+Lf4SYm5GkdS13MRQqpaYuzVf8QQ7N0/Sa+U+rw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 6 May 2026 15:14:55 +0530 Dev Jain wrote: > Speed up unmapping of anonymous large folios by clearing the ptes, and > setting swap ptes, in one go. > > ... > > Performance as measured on a Linux VM on Apple M3 (arm64): > > Vanilla - Mean: 37401913 ns, std dev: 12% > Patched - Mean: 17420282 ns, std dev: 11% > > No regression observed on 4K folios. > > Performance as measured on bare metal x86: > > Vanilla - mean: 54986286 ns, std dev: 1.5% > Patched - mean: 51930795 ns, std dev: 3% That looks nice. I'll pass at this time, wait for reviewer input. Most reviewers are jetlagged and exhausted, so a resend might be needed ;) Saskiko said a few things: https://sashiko.dev/#/patchset/20260506094504.2588857-1-dev.jain@arm.com