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Mon, 16 Feb 2026 02:06:04 -0800 (PST) Received: from google.com ([2a00:79e0:2031:6:16a9:1c52:52a1:18af]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-824c6a409e6sm9933774b3a.18.2026.02.16.02.06.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Feb 2026 02:06:03 -0800 (PST) Date: Mon, 16 Feb 2026 19:05:59 +0900 From: Sergey Senozhatsky To: Sergey Senozhatsky Cc: "David Hildenbrand (Arm)" , Lance Yang , Andrew Morton , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv2] mm: khugepaged: make scan loops suspend aware Message-ID: References: <20260211031512.261127-1-senozhatsky@chromium.org> <104bc764-5a20-4ac2-95a8-b31f41255766@kernel.org> <3571cf8b-9fb3-41b2-a402-a8537ee2c399@kernel.org> <16ce9ce2-8081-482c-a6ea-0932ebd081f1@kernel.org> <56345542-544a-48e4-b127-49a850deee9b@linux.dev> <5dc7d3a2-a358-481d-9352-d8356d3343c2@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: BE96318000E X-Stat-Signature: nhu9cib9g119gomfpr1opf7ibka78ius X-Rspam-User: X-HE-Tag: 1771236365-21811 X-HE-Meta: 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 wXrlf7TP ccAmnPaWLXYz5WvhV2jmmuyxMULtPwGAVeSVuhulUkSgAje8Tpfiw7TLEBs9jA3K0Jnp+jTCEMNerNMKYByGm5EZWOjbfsQyB2JNyqj9Am9JoKqqpDf6SGQJIfE3UNUmeKra9v4WtHEGUNbrbP/nNwZ4LiDf8wtrPgVFXEetY8C3GKQp/SmbqJ7yibq2SlAARbvekC2vKKbBoTfvRLybHD30/IN7oljs8puFbXB4Z5HdpF8x+CsPGICbclYjjCAapNdzb+sFeEujxTrDAr5kEJAarXY97CNk3Qnym6bmxP5TOjTEk64ObJcPHcG/sC0ORz+OsqFug74e62a8+/8r97KICYBi5v+0Nf2x1cF7MXDQ0RzU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On (26/02/16 18:50), Sergey Senozhatsky wrote: > On (26/02/16 10:24), David Hildenbrand (Arm) wrote: > > > Maybe we also need check points inside these loops to bail out early? > > > > I'd only do that if we have evidence that it's actually helpful. > > > > @Sergey, with which base page size are you running (4k vs. 16k vs 64k)? I > > assume your report is on aarch64, correct? > > I had reports from a 2 CPU Intel n50 device, with 4096 PAGE_SIZE. > I'm trying to repro on that device now (by running suspend/resume ^^^ on a similar device, not exactly the same. So I guess I wouldn't rule out the possibility of a h/w issue.