From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH 11/11] cgroup: use percpu refcnt for cgroup_subsys_states Date: Fri, 14 Jun 2013 22:35:22 -0700 Message-ID: <20130615053522.GA7017@htj.dyndns.org> References: <1371096298-24402-1-git-send-email-tj@kernel.org> <1371096298-24402-12-git-send-email-tj@kernel.org> <20130614132026.GD10084@dhcp22.suse.cz> <20130614223125.GD6593@mtj.dyndns.org> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=3jWlDHrguJdMtwMCSoPO9IITrSseBK5yvkpUmPJ5NUE=; b=0iD8HdOSJIiAQK5p9vkTF1AEjdVfCVA19VShicS96kmnAUi0/6a3oW2n7JOFoa45fZ u4B6AFXawQqzaNlwEpytN77yMJlbr77cHJ0BtEOG58f1d4Rd26cVSbpEqIwWGrsAt3OP fcikcQIFu6az4prmPzpfB0vpd/MVQylztyHerPuCZIJTbqCXlEGGR9XaNBzqneQnmrXH yiQoG6arDe/lwa5Xk+k0hp4QeHcFsQMh/H6hzXmi5u/Q1y6+lQ62F+Xxmsz7jxha7uk3 9cfJTdWP8PJWnyT6QYh++BebIuhIJ2/ohNapTb6Wo0cC46EvsTGko7hWatMa2kYo0fwa vu7A== Content-Disposition: inline In-Reply-To: <20130614223125.GD6593-9pTldWuhBndy/B6EtB590w@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michal Hocko Cc: lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, Mike Snitzer , Vivek Goyal , "Alasdair G. Kergon" , Jens Axboe , Mikulas Patocka , Glauber Costa On Fri, Jun 14, 2013 at 03:31:25PM -0700, Tejun Heo wrote: > I'll play with it a bit more on an actual machine and post more > results. Test program attached. So, here are the results from the same test on a dual-socket 2-way NUMA opteron 8 core machine. Running on one CPU. copy size atomic percpu diff in pct 0 535964443 616756827 +15.07% 32 399988186 378678713 -5.33% 64 389067476 355073979 -8.74% 128 342192631 315615300 -7.77% 256 281208005 260598931 -7.33% 512 188070912 193225269 +2.74% Running on all eight cores. copy size atomic percpu diff in pct 0 121324328 4889425511 +3,930.05% 32 96170193 2999613380 +3,019.07% 64 98139061 2813894184 +2,767.25% 128 112610025 2503229487 +2,122.92% 256 96828114 2069865752 +2,037.67% 512 95858297 1537726109 +1,504.17% Ration of all cores / single core. copy size atomic percpu 0 0.23 7.93 32 0.24 7.92 64 0.25 7.92 128 0.33 7.93 256 0.34 7.94 512 0.51 7.96 Note exactly 8 - the cores do share quite a bit of resources after all - but pretty close. Thanks. -- tejun