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[195.135.220.15]) by mx.google.com with ESMTPS id y38si7455455edd.0.2019.06.17.08.49.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2019 08:49:28 -0700 (PDT) Received-SPF: pass (google.com: domain of osalvador@suse.de designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of osalvador@suse.de designates 195.135.220.15 as permitted sender) smtp.mailfrom=osalvador@suse.de X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id ADE99ADEC; Mon, 17 Jun 2019 15:49:27 +0000 (UTC) Date: Mon, 17 Jun 2019 17:49:23 +0200 From: Oscar Salvador To: Alastair D'Silva Cc: 'Michal Hocko' , 'Alastair D'Silva' , 'Arun KS' , 'Mukesh Ojha' , 'Logan Gunthorpe' , 'Wei Yang' , 'Peter Zijlstra' , 'Ingo Molnar' , linux-mm@kvack.org, 'Qian Cai' , 'Thomas Gleixner' , 'Andrew Morton' , 'Mike Rapoport' , 'Baoquan He' , 'David Hildenbrand' , 'Josh Poimboeuf' , 'Pavel Tatashin' , 'Juergen Gross' , 'Oscar Salvador' , 'Jiri Kosina' , linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory Message-ID: <20190617154923.GB2407@linux> References: <20190617043635.13201-1-alastair@au1.ibm.com> <20190617043635.13201-5-alastair@au1.ibm.com> <20190617074715.GE30420@dhcp22.suse.cz> <068b01d524e2$4a5f5c30$df1e1490$@d-silva.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <068b01d524e2$4a5f5c30$df1e1490$@d-silva.org> User-Agent: Mutt/1.10.1 (2018-07-13) 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 17, 2019 at 05:57:16PM +1000, Alastair D'Silva wrote: > I was getting stalls when removing ~1TB of memory. Would you mind sharing one of those stalls-splats? I am bit spectic here because as I Michal pointed out, we do cond_resched once per section removed. -- Oscar Salvador SUSE L3