From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CFE2FC43334 for ; Wed, 8 Jun 2022 14:16:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 474CF6B0072; Wed, 8 Jun 2022 10:16:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3FCFF6B0073; Wed, 8 Jun 2022 10:16:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2C5596B0074; Wed, 8 Jun 2022 10:16:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 16E626B0072 for ; Wed, 8 Jun 2022 10:16:15 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id E327821452 for ; Wed, 8 Jun 2022 14:16:14 +0000 (UTC) X-FDA: 79555268268.03.F18924D Received: from mail-qt1-f173.google.com (mail-qt1-f173.google.com [209.85.160.173]) by imf29.hostedemail.com (Postfix) with ESMTP id 7BB97120065 for ; Wed, 8 Jun 2022 14:16:14 +0000 (UTC) Received: by mail-qt1-f173.google.com with SMTP id x18so12096884qtj.3 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=NoV9P5rwCyDGxD5syoD2B2xBRX/s/1FYNXNgfBUrt6r+f2Vn7kablngCvhXZGPB0Fw auMsEckBkz8OngrGYdfUPKTYmKqNeTbLB5sSG1d6WXtkZuWQlo+NE49e+4q4KfndVbnY hqID0CMfz3K5DnWTTx8A0QorNCzeX8mCG01BlzKB8K1D1Qs+W8nCbOwrH50UxlUGvRYN JhE/Hfy7RJl0/kHjG+09UJJIgaX9KRqUwgcmxqK08jwILMx1f+ajTX+0zmYnQM2jJp+i QlMcwm8iva31hgTFPjzmx37PhLCrsnrdDvyF1KdDgzO6xzTaG1pqlg5SBmz0vfhlT/de rhhg== X-Gm-Message-State: AOAM532INuqsr2P+0VigTnP1Lf7L6oQLj+OpND5anKJBIyvL5lqqjZZP a6o7oN1MnMfSQL5JTteXRXWPJjDzeoPmAA== X-Google-Smtp-Source: ABdhPJxVj0WsWXId7O8rVRKJ3c5Bgp+IUhbOfvsP/9LHyLgbkhXYY1p5hwNBNfBiykdYX+DJR5WB1g== 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-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 7BB97120065 X-Stat-Signature: umaoctzbi6hwzytpcjbu14ifk3684k19 Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=cmpxchg-org.20210112.gappssmtp.com header.s=20210112 header.b=zodZYwDc; dmarc=pass (policy=none) header.from=cmpxchg.org; spf=pass (imf29.hostedemail.com: domain of hannes@cmpxchg.org designates 209.85.160.173 as permitted sender) smtp.mailfrom=hannes@cmpxchg.org X-HE-Tag: 1654697774-828970 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: 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!