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[156.151.31.85]) by mx.google.com with ESMTPS id k190si1345975ith.139.2019.01.11.09.53.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Jan 2019 09:53:24 -0800 (PST) Received-SPF: pass (google.com: domain of daniel.m.jordan@oracle.com designates 156.151.31.85 as permitted sender) client-ip=156.151.31.85; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=pKSoOo23; spf=pass (google.com: domain of daniel.m.jordan@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=daniel.m.jordan@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id x0BHcvS3129655; Fri, 11 Jan 2019 17:53:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2018-07-02; bh=L3ihz0Ird+e4+UHksRLQl2xkZDvYaSIUNPIJGpUrwR4=; b=pKSoOo23bd9rQm7LCdqSKg1G3TbIQjAP5IxsKDKvbWCf27qE+Oo1cVc1Ev24h7ZQm95w NVH/B37nO4BBLl+Pbujb4ItV0IGuLEL549K+1kQ1XTMftflXMA/UJkHyw0Wp9tn/aYRi tM1J6AdjwzbxRDf72I9u37v74I8acuxEPO8oqpE1PLMkTXbmTqfBFG+QI++PZegDd49l ZuQPR9YBECsVKdR2QqhyFJQPQqxA7sZPo4Z2HKeY6a/jhX2X9CbOWckVyZdzRGr1dnZC YD0CbFc/4AaDsE7Vgy/XosNKYzhcP/m+58AWyBRs077+XSZs7tg97VTrFZMGRys2jXpD qg== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp2120.oracle.com with ESMTP id 2ptn7re58j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Jan 2019 17:53:20 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x0BHr3Li015213 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Jan 2019 17:53:03 GMT Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x0BHqijW009240; Fri, 11 Jan 2019 17:52:44 GMT Received: from ca-dmjordan1.us.oracle.com (/10.211.9.48) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 11 Jan 2019 09:52:44 -0800 Date: Fri, 11 Jan 2019 09:53:01 -0800 From: Daniel Jordan To: Michal Hocko Cc: Baptiste Lepers , mgorman@techsingularity.net, akpm@linux-foundation.org, dhowells@redhat.com, linux-mm@kvack.org, hannes@cmpxchg.org Subject: Re: Lock overhead in shrink_inactive_list / Slow page reclamation Message-ID: <20190111175301.csgxlwpbsfecuwug@ca-dmjordan1.us.oracle.com> References: <20190111135938.GG14956@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190111135938.GG14956@dhcp22.suse.cz> User-Agent: NeoMutt/20180323-268-5a959c X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9133 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=788 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901110144 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000298, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jan 11, 2019 at 02:59:38PM +0100, Michal Hocko wrote: > On Fri 11-01-19 16:52:17, Baptiste Lepers wrote: > > Hello, > > > > We have a performance issue with the page cache. One of our workload > > spends more than 50% of it's time in the lru_locks called by > > shrink_inactive_list in mm/vmscan.c. > > Who does contend on the lock? Are there direct reclaimers or is it > solely kswapd with paths that are faulting the new page cache in? Yes, and could you please post your performance data showing the time in lru_lock? Whatever you have is fine, but using perf with -g would give callstacks and help answer Michal's question about who's contending. Happy to help profile and debug offline.