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Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.2 #2 (Red Hat Linux)) id 1x1JKd-0000000AiYv-1nB5; Tue, 01 Sep 2026 07:55:00 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 916683002ED; Tue, 01 Sep 2026 09:54:57 +0200 (CEST) Date: Tue, 1 Sep 2026 09:54:57 +0200 From: Peter Zijlstra To: Jianyong Wu Cc: Ingo Molnar , Juri Lelli , Vincent Guittot , Chen Yu , Tim Chen , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Shrikanth Hegde , Phil Auld , Andrew Morton , David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, jianyong.wu@outlook.com, zhongyuan@hygon.cn, huangsj@hygon.cn, wangfengyu@hygon.cn, yingzhiwei@hygon.cn, justin.he@arm.com Subject: Re: [RFC PATCH v2 09/23] sched/cache: Account percpu sd task NUMA preference Message-ID: <20260901075457.GO4120091@noisy.programming.kicks-ass.net> References: <20260827122816.756234-1-wujianyong@hygon.cn> <20260827122816.756234-10-wujianyong@hygon.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260827122816.756234-10-wujianyong@hygon.cn> X-Stat-Signature: or9ztskb7asmqkdga1tbpyccnkbocakw X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 0C4604000C X-Rspam-User: X-HE-Tag: 1788249309-554958 X-HE-Meta: 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 +6VuBN+r pWlpcvFsKjGQ3Esibrv+063mJ8bzjB1Q15+NZtkCncKpmaR5mxVi1CcqtvOPaPwueB7DnfLlThahhWVy1XOJfybkzYhJWRpjkFn41rMKfYkTI0m90ZrR6IFB1hOJTHU0RNX5P49A8zRS2KfjHE0sYKKjQG3zzdL+NRrLINIHL+SUGHbCVF5SgqvwXdPR3Z5ZdHbCWb/UOCpYjwOG6FTkTuTI5BcE+EQdu2OopOPVy09O98E4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 27, 2026 at 08:28:02PM +0800, Jianyong Wu wrote: > Account for per-NUMA task count preferences within per-CPU sched domains, > mirroring the existing implementation of LLC task preference logic. So in general I would really appreciate a few words on *why* you're doing things. I mean, I can read the patch and see what it does, but I cannot divinate (esp. not without yet having read the rest of the patches) why you're doing things. This is esp. important for large series -- or series that do complicated things -- or like this case: both!