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Thu, 20 Feb 2020 19:55:25 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 2y8ud6v9fm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 20 Feb 2020 19:55:25 +0000 Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 01KJtIre029033; Thu, 20 Feb 2020 19:55:21 GMT Received: from ca-dmjordan1.us.oracle.com (/10.211.9.48) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 20 Feb 2020 11:55:18 -0800 Date: Thu, 20 Feb 2020 14:55:35 -0500 From: Daniel Jordan To: Tejun Heo Cc: Daniel Jordan , Johannes Weiner , Michal Hocko , Andrew Morton , Roman Gushchin , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, Peter Zijlstra Subject: Re: [PATCH] mm: memcontrol: asynchronous reclaim for memory.high Message-ID: <20200220195535.7xblt45akld6eftj@ca-dmjordan1.us.oracle.com> References: <20200219181219.54356-1-hannes@cmpxchg.org> <20200219183731.GC11847@dhcp22.suse.cz> <20200219191618.GB54486@cmpxchg.org> <20200219195332.GE11847@dhcp22.suse.cz> <20200219214112.4kt573kyzbvmbvn3@ca-dmjordan1.us.oracle.com> <20200219220859.GF54486@cmpxchg.org> <20200220154524.dql3i5brnjjwecft@ca-dmjordan1.us.oracle.com> <20200220155651.GG698990@mtj.thefacebook.com> <20200220182326.ubcjycaubgykiy6e@ca-dmjordan1.us.oracle.com> <20200220184545.GH698990@mtj.thefacebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200220184545.GH698990@mtj.thefacebook.com> User-Agent: NeoMutt/20180716 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9537 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=694 mlxscore=0 adultscore=0 spamscore=0 suspectscore=0 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002200143 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9537 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 impostorscore=0 mlxlogscore=757 malwarescore=0 mlxscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002200143 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 Thu, Feb 20, 2020 at 01:45:45PM -0500, Tejun Heo wrote: > The setup cost can be lazy optimized but it'd still have to bounce the > tiny pieces of work to different threads instead of processing them in > one fell swoop from the same context, which most likely is gonna be > untenably expensive. I see, your last mail is clearer now. If it's easy to do, a pointer to where this happens would help so we're on the same page. thanks, Daniel