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[98.15.154.102]) by smtp.gmail.com with ESMTPSA id k190sm5520250qkf.59.2022.02.07.08.18.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Feb 2022 08:18:05 -0800 (PST) Date: Mon, 7 Feb 2022 11:18:04 -0500 From: Johannes Weiner To: Huang Ying Cc: Peter Zijlstra , Mel Gorman , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Feng Tang , Yang Shi , Baolin Wang , Andrew Morton , Michal Hocko , Rik van Riel , Mel Gorman , Dave Hansen , Zi Yan , Wei Xu , osalvador , Shakeel Butt , zhongjiang-ali Subject: Re: [PATCH -V11 1/3] NUMA Balancing: add page promotion counter Message-ID: References: <20220128082751.593478-1-ying.huang@intel.com> <20220128082751.593478-2-ying.huang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220128082751.593478-2-ying.huang@intel.com> X-Stat-Signature: attoru98bb3j8udp139unu8ap7aonxqt X-Rspam-User: nil Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=cmpxchg-org.20210112.gappssmtp.com header.s=20210112 header.b=MUHve6+7; spf=pass (imf07.hostedemail.com: domain of hannes@cmpxchg.org designates 209.85.222.170 as permitted sender) smtp.mailfrom=hannes@cmpxchg.org; dmarc=pass (policy=none) header.from=cmpxchg.org X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 69E6940007 X-HE-Tag: 1644250686-230314 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 Fri, Jan 28, 2022 at 04:27:49PM +0800, Huang Ying wrote: > In a system with multiple memory types, e.g. DRAM and PMEM, the CPU > and DRAM in one socket will be put in one NUMA node as before, while > the PMEM will be put in another NUMA node as described in the > description of the commit c221c0b0308f ("device-dax: "Hotplug" > persistent memory for use like normal RAM"). So, the NUMA balancing > mechanism will identify all PMEM accesses as remote access and try to > promote the PMEM pages to DRAM. > > To distinguish the number of the inter-type promoted pages from that > of the inter-socket migrated pages. A new vmstat count is added. The > counter is per-node (count in the target node). So this can be used > to identify promotion imbalance among the NUMA nodes. > > Signed-off-by: "Huang, Ying" > Reviewed-by: Yang Shi > Tested-by: Baolin Wang > Reviewed-by: Baolin Wang > Cc: Andrew Morton > Cc: Michal Hocko > Cc: Rik van Riel > Cc: Mel Gorman > Cc: Peter Zijlstra > Cc: Dave Hansen > Cc: Zi Yan > Cc: Wei Xu > Cc: osalvador > Cc: Shakeel Butt > Cc: zhongjiang-ali > Cc: linux-kernel@vger.kernel.org > Cc: linux-mm@kvack.org Acked-by: Johannes Weiner