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a="183307834" X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="183307834" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2021 07:39:32 -0700 IronPort-SDR: 2a6rd7eHfNnn9G08o28SW4+k/wLRHR+FGambmhbJqOqXg0uAiCDbJ2QlFnXrRDPpsID/+yb+X9 g6MrJ2FjD/LA== X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="481068021" Received: from yihleong-mobl.amr.corp.intel.com (HELO [10.255.228.69]) ([10.255.228.69]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2021 07:39:31 -0700 Subject: Re: [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs To: Mel Gorman Cc: Andrew Morton , Hillf Danton , Dave Hansen , Vlastimil Babka , Michal Hocko , LKML , Linux-MM , "Tang, Feng" References: <20210525080119.5455-1-mgorman@techsingularity.net> <7177f59b-dc05-daff-7dc6-5815b539a790@intel.com> <20210528085545.GJ30378@techsingularity.net> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210528085545.GJ30378@techsingularity.net> Content-Type: text/plain; charset=iso-8859-15 Content-Language: en-US X-Rspamd-Queue-Id: 5A6F2C009183 Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf03.hostedemail.com: domain of dave.hansen@intel.com has no SPF policy when checking 192.55.52.151) smtp.mailfrom=dave.hansen@intel.com X-Rspamd-Server: rspam04 X-Stat-Signature: qk6bo6urunqwtnewnh3a3j1gdwaakpnn X-HE-Tag: 1622212765-124972 Content-Transfer-Encoding: quoted-printable 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 5/28/21 1:55 AM, Mel Gorman wrote: > - * onlined. > - */ > - nr_local_cpus =3D max(1U, cpumask_weight(cpumask_of_node(zone_to_nid(= zone)))) + cpu_online; > - high =3D total_pages / nr_local_cpus; > + * onlined. For memory nodes that have no CPUs, split pcp->high acros= s > + * all online CPUs to mitigate the risk that reclaim is triggered > + * prematurely due to pages stored on pcp lists. > + */ > + nr_split_cpus =3D cpumask_weight(cpumask_of_node(zone_to_nid(zone))) = + cpu_online; > + if (!nr_split_cpus) > + nr_split_cpus =3D num_online_cpus(); > + high =3D total_pages / nr_split_cpus; Updated version looks fine to me, thanks! BTW, to do some of this testing, Feng was doing a plain old kernel build. On the one system where this got run, he noted a ~2% regression in build times. Nothing major, but you might want to be on the lookout in case 0day or the other test harnesses find something similar once this series gets to them. Acked-by: Dave Hansen