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[2620:137:e000::1:18]) by mx.google.com with ESMTPS id k34-20020a634b62000000b003db0f2baa25si4326825pgl.90.2022.06.08.07.42.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jun 2022 07:42:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18; Authentication-Results: mx.google.com; dkim=pass header.i=@cmpxchg-org.20210112.gappssmtp.com header.s=20210112 header.b=zodZYwDc; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=cmpxchg.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ABAFE3BBE1; Wed, 8 Jun 2022 07:16:22 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241021AbiFHOQR (ORCPT + 99 others); Wed, 8 Jun 2022 10:16:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239694AbiFHOQQ (ORCPT ); Wed, 8 Jun 2022 10:16:16 -0400 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 886B83B025 for ; Wed, 8 Jun 2022 07:16:14 -0700 (PDT) Received: by mail-qt1-x82f.google.com with SMTP id hf10so14961849qtb.7 for ; Wed, 08 Jun 2022 07:16:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg-org.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=h7N335UFTXnHO0leC4IVZEdPoke4t13sB0ujYHwtWyk=; b=zodZYwDc6rWs8ZvzUFT3Om/6LcXy+l8BJIKcShifIxQQkwi6e+Op/p2WMi5fveqegX jRbtQH5mEzH4yGo7sj1s+nO6z/XVMoAxauIgSBcsrCSkWbrB+7cPf4B9w8oK5eYrR8bI vT0zN0kw+nWPmXd3Ux5P+bxGrWjN9kZSXuDS0f5bbtyQYusME83pKFdSwEPLl8QCpwyq IoYQ3x1cUjpf8NI6Riml2WnWuQBSeFsjzMBG6U8LEXQerMRwKal/n/T7ZoSKwCVJLkgU YlK8Ut8upBm1j6DRmDWzVZydXzfxgQ9V9RtQaqzozO4a79IiNzTu+MsTYYsbFKUwwNNm YT+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=h7N335UFTXnHO0leC4IVZEdPoke4t13sB0ujYHwtWyk=; b=XlLON0OF+KGH8fFNaZTgAflZ+7eZAK2k0KvDn/qJEHSdPLmBFXIYZ2q03jQYvratyY 0Tsb5vRMILQuEW9jT699hq/TaacrgiXg6o4YTMxWcjVG00xrtlOl66PVzlr8rMSbvLJy uQblxwxXkGdjC22DcJ3UT/u2cHK85ab0tnPsCaQGPfotAPyKNwXe1c3Wlv7CJuROcOi1 DXupAGqP7panJZq1WSQv5yjvXg6c6zGSv6S1MqKmEWdflcl4KQyurJ/4rJt42n+bEwgr ji4HYqoTO+mrjcc8RumCnWOyj2h/Qk7dkf3PW4Ac6wYnPcxi8VJzy/dFlLNF1aOUGspX 2+1A== X-Gm-Message-State: AOAM533o4DQcjzaytrxrVfeEHR0eS86no9hqAVUySYeSFZMAeD5xhhdo fczYYA/j1GFFGchGcn9RFwe/Pg== X-Received: by 2002:a05:622a:11c5:b0:304:d8cd:2058 with SMTP id n5-20020a05622a11c500b00304d8cd2058mr25095671qtk.324.1654697773504; Wed, 08 Jun 2022 07:16:13 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::1:4759]) by smtp.gmail.com with ESMTPSA id ca21-20020a05622a1f1500b0030504576cbfsm926861qtb.61.2022.06.08.07.16.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jun 2022 07:16:12 -0700 (PDT) Date: Wed, 8 Jun 2022 10:16:12 -0400 From: Johannes Weiner To: Ying Huang Cc: linux-mm@kvack.org, Hao Wang , Abhishek Dhanotia , Dave Hansen , Yang Shi , Tim Chen , Davidlohr Bueso , Adam Manzanares , linux-kernel@vger.kernel.org, kernel-team@fb.com, Hasan Al Maruf , Wei Xu , "Aneesh Kumar K.V" , Yang Shi Subject: Re: [PATCH] mm: mempolicy: N:M interleave policy for tiered memory nodes Message-ID: References: <20220607171949.85796-1-hannes@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 08, 2022 at 12:19:52PM +0800, Ying Huang wrote: > In general, I think the use case is valid. Excellent! > But we are changing memory tiering now, including > > - make memory tiering explict > > - support more than 2 tiers > > - expose memory tiering via sysfs > > Details can be found int the following threads, > > https://lore.kernel.org/lkml/CAAPL-u9Wv+nH1VOZTj=9p9S70Y3Qz3+63EkqncRDdHfubsrjfw@mail.gmail.com/ > https://lore.kernel.org/lkml/20220603134237.131362-1-aneesh.kumar@linux.ibm.com/ > > With these changes, we may need to revise your implementation. For > example, put interleave knobs in memory tier sysfs interface, support > more than 2 tiers, etc. Yeah, I was expecting the interface to be the main sticking point ;) I'll rebase this patch as the mentioned discussions find consensus. Thanks!