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[2603:7000:c01:2716:ea:7f88:5fd9:1cd]) by smtp.gmail.com with ESMTPSA id b128-20020ae9eb86000000b006a7137330e2sm6105984qkg.132.2022.06.13.06.16.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jun 2022 06:16:14 -0700 (PDT) Date: Mon, 13 Jun 2022 09:16:13 -0400 From: Johannes Weiner To: Ying Huang Cc: Aneesh Kumar K V , linux-mm@kvack.org, akpm@linux-foundation.org, Wei Xu , Greg Thelen , Yang Shi , Davidlohr Bueso , Tim C Chen , Brice Goglin , Michal Hocko , Linux Kernel Mailing List , Hesham Almatary , Dave Hansen , Jonathan Cameron , Alistair Popple , Dan Williams , Feng Tang , Jagdish Gediya , Baolin Wang , David Rientjes Subject: Re: [PATCH v6 01/13] mm/demotion: Add support for explicit memory tiers Message-ID: References: <20220610135229.182859-1-aneesh.kumar@linux.ibm.com> <20220610135229.182859-2-aneesh.kumar@linux.ibm.com> <7e0b41422dbd0976cb43c2f126e9371d5e311e77.camel@intel.com> <48096ad7-ce6d-79b7-1edd-7e6652ab2a4d@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655131954; a=rsa-sha256; cv=none; b=CJMr9/t/cheiswnNWIaEi4o+3zmId5tSKghfkLyVI5CyBQRor+9OTUkv0fevosxcsIBhdg 0EQ9CzYxjNwy23Y+yEEnoCMxWoFA1WqXXdN5KymQL50YeaqIRBNYNeoq9yaGv6ILtzcW1J 3zt4o+teknLhzL7FEx3cKsqVNxjMwXQ= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=cmpxchg-org.20210112.gappssmtp.com header.s=20210112 header.b=Z169z99Y; dmarc=pass (policy=none) header.from=cmpxchg.org; spf=pass (imf19.hostedemail.com: domain of hannes@cmpxchg.org designates 209.85.222.182 as permitted sender) smtp.mailfrom=hannes@cmpxchg.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655131954; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vTUVTphSjRqOLzEAq4AJERTLad8wEOEYyPCB9Gzzk28=; b=lNR8GwWVzk2PbHlLoDSDJXFrCQ/qkXHtZUuKbLAzliCecjcMQvo1DfiBCwNx32r6hfsnPC k34rjHkB7RfBWy0za1kocQArGorbEmh2t6afR8Zi7m30lszQX1i3YlAIJGk/FVkk1FVA6g 4NO2NNpyh4WZdDC7hCKICJ+EkjZuTw4= Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=cmpxchg-org.20210112.gappssmtp.com header.s=20210112 header.b=Z169z99Y; dmarc=pass (policy=none) header.from=cmpxchg.org; spf=pass (imf19.hostedemail.com: domain of hannes@cmpxchg.org designates 209.85.222.182 as permitted sender) smtp.mailfrom=hannes@cmpxchg.org X-Rspam-User: X-Rspamd-Server: rspam12 X-Stat-Signature: k81pnthwgza5xa5j5u9nieoc3gixtdun X-Rspamd-Queue-Id: 91F1C1A063B X-HE-Tag: 1655131954-517990 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 Mon, Jun 13, 2022 at 01:30:08PM +0800, Ying Huang wrote: > On Mon, 2022-06-13 at 09:01 +0530, Aneesh Kumar K V wrote: > > On 6/13/22 8:52 AM, Ying Huang wrote: > > > On Fri, 2022-06-10 at 19:22 +0530, Aneesh Kumar K.V wrote: > > > > +config TIERED_MEMORY > > > > + def_bool NUMA > > > > + > > > > > > As Yang pointed out, why not just use CONFIG_NUMA? I suspect the > > > added value of CONIFIG_TIRED_MEMORY. > > > > I decided to use TIERED_MEMORY to bring more clarity. It should be same > > now that we have moved CONFIG_MIGRATION dependencies to runtime. IMHO > > having CONFIG_TIERED_MEMORY is better than using CONFIG_NUMA. > > I don't think CONFIG_TIERED_MEMORY bring no much value. It's better > to use CONFIG_NUMA directly. But this is just my opinion. I agree. As long as it's always built with CONFIG_NUMA, it's simply NUMA code. Easy enough to modularize it later if somebody really wants this to be configurable separately.