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Thu, 15 Oct 2026 04:36:53 +0000 X-Mizu-Trace-ID: c19b6154bdd8c5f2 X-Migadu-Flow: FLOW_OUT From: Lance Yang To: kas@kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, vbabka@kernel.org, jannh@google.com Subject: Re: [PATCH v5 2/9] mm/khugepaged: count collapses where khugepaged makes them Date: Thu, 15 Oct 2026 12:36:38 +0800 Message-ID: <20261015043638.57643-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261014171145.3292736-3-kas@kernel.org> References: <20261014171145.3292736-3-kas@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 25DB91C0006 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: bgyo7ft8f1dt1e5we9efsotq6p9wkf6d X-HE-Tag: 1792039014-566769 X-HE-Meta: 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 y9RIcwoy YoC4VLjnT8fuE2wZbS3fWhltw4lmEQzFCRDJmPilNM8PCWDnTtpEkKiXRPimFqnTV+EsEb7Y5hF22ASV27l3xdgsxECBDL+DD2L0tRSEVfbSqqki0eFE34z8PkIWOSqfjFrUBvz9kri+8cgRao4rJfti4wsX+quK6e3ocE5EuxE4HTI+E3Hi56Q7L3IQK5ORZ97O4YFrYAQpPUqVyvPeJAJ27Ndhr1PjtYSj/nCIcfNb9z2CQjZHYuVsk9Uu03Xig6AIKX7b1/60DhRFd6n4I28KufnRPeJLwzGHxfbf2ga6Sp00L7vFtb7IAHA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 14, 2026 at 06:11:35PM +0100, Kiryl Shutsemau (Meta) wrote: >collapse_single_pmd() bumps khugepaged_pages_collapsed for its caller, and >tests cc->is_khugepaged to know whether it should: the counter belongs to >the daemon, and MADV_COLLAPSE must not touch it. > >The daemon sees every result of every collapse it asks for, so it can keep >its own counter without the shared path testing who called. > >Assisted-by: LLM >Acked-by: David Hildenbrand (Arm) >Reviewed-by: Zi Yan >Reviewed-by: Baolin Wang >Signed-off-by: Kiryl Shutsemau (Meta) >--- Reviewed-by: Lance Yang