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b=nFJ/Q0ZgIzG50WO/AI1/5yODoNQj7ueXInuMSDgVRCkvcZuqgZyA+wItoQ+lRHXid 3ZbWaTENm+BgSkvdsFyXdhu1QvyUsNNYcu3lpNBnR7fGH1p20yKHKo/PsDi8eGAfuf rvQ9qJ2a6MFod7iy42qyBxhTnwHW3deIUxQFTYcgFBlo53xiwUv64EH5fF++rRIBUm zmkf6b3FK+R5D2uJ+pfO0nqXewuq3OU0rK76J1cIBqvrXfjUBp54kL0Lk85gS4tAEf 64M6g5UaEFIvLzlCOBx1Xqm+YI2WF7q8gnR7VnRrIPew2Hz2g85yrxEY3NjbR4KsEA AKbZva0DwYzaQ== From: SJ Park To: Aveline Noir Cc: SJ Park , Andrew Morton , Shubhang Kaushik , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Fernand Sieber , Leonard Foerster , SeongJae Park , Shakeel Butt , Shubhang Kaushik , Christoph Lameter Subject: Re: [PATCH] mm/damon: align MMU notifier range when clearing PMD young bit Date: Fri, 23 Oct 2026 18:25:39 -0700 Message-ID: <20261024012540.89397-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <179273169185.2.1655708299473876346.damon-pmd-kvm-reply-draft@gmail.com> References: X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 1156B40005 X-Stat-Signature: 5i6ezgwycpmfg4se4ohw1n7c5obyji8j X-Rspamd-Server: rspam04 X-Spam-Status: No, score=-9.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1792805147-958126 X-HE-Meta: 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 kn/bulgZ K/aYAamxLvxjElDAFYwohPCEvV45VhRa9OXUbF150ErJHV/pgqAo8ljnWxhn3+uOavmTGaRqyiy6zcWu7t3JsWjdG7iiW6l5+0bjQGqmbAIvV5vgFnzl4/gGLBO4h5ifm0ZNo3B1sAmVYRu1weQUZXYE+Lx6yXTDDHprhq1SG6lXGc8Jy2CAbKq+hgnifb0xUxnEgKr2zr+NHSIhsH+yb1aqoSRcXt07kUTvzCKouuK3iHBS0tfAofOgZO4RJJ/UB740pZ6lw0/9gbRuZt36JKcgbpQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Fri, 23 Oct 2026 13:01:31 +0800 Aveline Noir wrote: > Hi SJ, > > On Thu, 22 Oct 2026 17:20:17 -0700 SJ Park wrote: > > I Cc-ed them. Please Cc all > > recipients who get_maitnainer.pl is recommending, from the next time. > > Sorry for that. Maybe I will use b4 next time :) > > > However, I think this patch explains its context very well, and therefore > > this link is not needed. > > Sure , That make sense. > > > Were you also able to confirm the expected wrong behavior (missing part > > of the sampled huge page and age secondary mapping), too? > > Yes. A test with nested x86-64 KVM confirmed both effects. With > 4 KiB EPT mappings, a midpoint PMD sample left the first 1 MiB young and > aged the next THP's first 1 MiB. With 2 MiB EPT mappings, both whole THPs > were aged. After the fix, only the sampled THP was aged in both cases. Thank you for confirming! Thanks, SJ [...]