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bh=4ZgROYSFX3uxrNR5jpP0XfaMHw/DaoPH2lgDKlwezuY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=iB3y2nsFBMKfAAVx/mDQIl6NqTb6vNM3Wtbs7LJ6JXVXIHixsjFy24NuALtMNEA78 RswEHWxDTSjCj6WcaaKlbRDyoBJV5eMAHIbYfUvKldVz5+B3vNtd1gsXGTb/Lvt7cR +bq95bOiWJZ38nQSoH8qqkA0NDUCoaHuFP/SsL+gqEkmmI9/OggVa5UeCXomRA24G9 XH8P2uO/zy7NZsKblD+4lExNvMGoO1R6C4HouLVtnCH17Gl87e3W9OpHGlw4mJ1Hsf p757BDd/K5HWCppehd5KakAhD01doOIQea7Wh6d2MANIXStfCVRH/vxKGtfltY1Wmp rQGEza6WYsRag== From: SJ Park To: CharSyam Cc: SJ Park , damon@lists.linux.dev, linux-mm@kvack.org, akpm@linux-foundation.org, bijantabatab@micron.com, ravis.opensrc@micron.com, bijan311@gmail.com Subject: Re: [PATCH] mm/damon/vaddr: preserve migration weights above UINT_MAX Date: Tue, 27 Oct 2026 17:54:52 -0700 Message-ID: <20261028005452.157810-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 5BE97180003 X-Stat-Signature: dz35o71xn7acnocem3xpbtnqwgf1sree X-Rspamd-Server: rspam01 X-Spam-Status: No, score=-8.8 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-HE-Tag: 1793148901-606388 X-HE-Meta: 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 fhwgprnf 4bDSGGwf9v/sGvJuwObiOSbYMPR/dopBZYQYWjqs7sCktN0j3WbrYb95ehunVYTo5ywE5jPp8yatI/+NMBUDvlDKrm1US7Wip2RbwVnpfeWKfGkxiF2JjJWnHFlWnD5xXLgHAjiI0+obBBFj9TZNmWxShYMgCFhQqAIae4TFfnHp/hmawWPfHEWMNtGnD+2htRQuGmwqZccSqpMKlYPIpT7TsnpdbfRSAfafIGqoOVvXlp9j9IUJ+2KqSkjv+wCx7T+AE5B2b926du9AezfNCUXEaSjmlx5KeU0gbom8tAg5WpLEEei+X+LDS9C0s/pG/RKU+Zf9p1bpn1b4= 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 Apparently Bijan's micron email is no more working. I added Bijan's gmail to Cc list. On Wed, 28 Oct 2026 08:57:06 +0900 CharSyam wrote: > Hi, SJ. > > Thanks for your reply. You're welcome! > > 1. I found this by code inspection, not from a real-world bug report. > I consider it a correctness issue for valid inputs. Thank you for clarifying. > 2. I would prefer a u64 total over rejecting those inputs, since the > interface does not document a limit on the sum of weights. But I doubt the value of documenting it. I wonder if real users will find the behavior at all. I think it would be not too late to consider documenting it after we get an issue report from a real world user. Even just keeping the current behavior looks not really bad to me, as long as it is easy to test and only shoot the foot of users who didn't run test for their weird inputs. We can revisit after a real issue report is delivered. What do you think? > 3. Given the lack of a reported real-world impact, I do not think Cc: > stable is needed. Makes sense, I agree. Please avoid top-posting [1] from the next time. [1] https://subspace.kernel.org/etiquette.html#do-not-top-post-when-replying Thanks, SJ [...]