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{ "id": 815939, "url": "http://patchwork.ozlabs.org/api/covers/815939/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/cover/20170919232709.14690-1-edumazet@google.com/", "project": { "id": 7, "url": "http://patchwork.ozlabs.org/api/projects/7/?format=api", "name": "Linux network development", "link_name": "netdev", "list_id": "netdev.vger.kernel.org", "list_email": "netdev@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170919232709.14690-1-edumazet@google.com>", "list_archive_url": null, "date": "2017-09-19T23:27:02", "name": "[v2,net-next,0/7] net: speedup netns create/delete time", "submitter": { "id": 13357, "url": "http://patchwork.ozlabs.org/api/people/13357/?format=api", "name": "Eric Dumazet", "email": "edumazet@google.com" }, "mbox": "http://patchwork.ozlabs.org/project/netdev/cover/20170919232709.14690-1-edumazet@google.com/mbox/", "series": [ { "id": 3987, "url": "http://patchwork.ozlabs.org/api/series/3987/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=3987", "date": "2017-09-19T23:27:02", "name": "net: speedup netns create/delete time", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/3987/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/815939/comments/", "headers": { "Return-Path": "<netdev-owner@vger.kernel.org>", "X-Original-To": "patchwork-incoming@ozlabs.org", "Delivered-To": "patchwork-incoming@ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=netdev-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=google.com header.i=@google.com\n\theader.b=\"DK1Bdu9n\"; dkim-atps=neutral" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xxfD42Lx8z9sPr\n\tfor <patchwork-incoming@ozlabs.org>;\n\tWed, 20 Sep 2017 09:27:16 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751692AbdISX1O (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tTue, 19 Sep 2017 19:27:14 -0400", "from mail-pf0-f170.google.com ([209.85.192.170]:48727 \"EHLO\n\tmail-pf0-f170.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751556AbdISX1M (ORCPT\n\t<rfc822;netdev@vger.kernel.org>); Tue, 19 Sep 2017 19:27:12 -0400", "by mail-pf0-f170.google.com with SMTP id n24so602558pfk.5\n\tfor <netdev@vger.kernel.org>; Tue, 19 Sep 2017 16:27:12 -0700 (PDT)", "from localhost ([2620:15c:2cb:201:58bc:17b0:6372:1d5f])\n\tby smtp.gmail.com with ESMTPSA id\n\tz69sm4999602pfl.86.2017.09.19.16.27.11\n\t(version=TLS1_2 cipher=AES128-SHA bits=128/128);\n\tTue, 19 Sep 2017 16:27:11 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=google.com; s=20161025;\n\th=from:to:cc:subject:date:message-id;\n\tbh=ObM49A31oLRLWEDY5TtgjmA6ReI0Sxc7v1poiAYsuTA=;\n\tb=DK1Bdu9n0w+WAelLm0W3ZWW8l6gK33YuWzZT01BWxS02R4BvPlLv3YOM0loNwmGoJD\n\tupwfWvhMX/eG4IE0FYbXBIK0arwV/Gh9N2NKUbRIdNydqDkU/Uni0rp1U7M5xM+64gQm\n\t07rD0RmsluUAqQsyKY1FGlgkSlk+RPiWGPGjoovRc3MHfCtVbE44EF93vD3NJkiaS4JC\n\tFw6hl43PRo6VCjEXgqcQ9emgPMAVHMEz5vjy4rP7vKyPiatcjCkJlcUYBdMB4Uau6Rbj\n\tczUicG8DK7ymLqfwxuY8saSgRAfG7AZYu0gips44TnIbLQCN12ZcUrz9FJl9g9rn/Ksn\n\tc02A==", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id;\n\tbh=ObM49A31oLRLWEDY5TtgjmA6ReI0Sxc7v1poiAYsuTA=;\n\tb=AzMSbQM1xLA1XHrwSVzrrgIpqCAsJnFzwS347AaZ8EcTByC15nak0A74DntQh0iyCp\n\tU03RF9rmOzRG2b5jn9BRKbx8WObbBivGc5qVoyf2Y+/tiPYDzeXH8rQZCojoJROx9nzT\n\tW644a+GGIN8HijzSzpl4pZZmSAIl6rMhEMOMUorEW4TIIofxqeMnzZIH+QziIt+GJhOK\n\tPOX1QpKxmuYqopvrwVZ9pASfUuI47QNQc0IOrR3t1Tf7YXzlc6OO+plg5PPwM9bPQZWx\n\touAPooaQJOVrAkHQ6wb2CvNXEWUd+95Jgk5/CO5VeMBcBxR/mZJaQhtdHbotMBHlwaGq\n\t0t2w==", "X-Gm-Message-State": "AHPjjUj/Dx/sESsU9TvX6i5qcKfRO+Cym1xf2jkGuFfjXjGxt25XQrGy\n\tliazGu/J9saGta/o05SF9Xw6AkMpkEI=", "X-Google-Smtp-Source": "AOwi7QCy6tE1V6yttYVarX9NJjP1qIl8W0HLrv+3OWDvx7FoJHcefpdNPJO2eDtnqP86bgpPlHZVMQ==", "X-Received": "by 10.101.83.4 with SMTP id m4mr242454pgq.266.1505863632321;\n\tTue, 19 Sep 2017 16:27:12 -0700 (PDT)", "From": "Eric Dumazet <edumazet@google.com>", "To": "\"David S . Miller\" <davem@davemloft.net>", "Cc": "netdev <netdev@vger.kernel.org>,\n\t\"Eric W . Biederman\" <ebiederm@xmission.com>,\n\tEric Dumazet <edumazet@google.com>, Eric Dumazet <eric.dumazet@gmail.com>", "Subject": "[PATCH v2 net-next 0/7] net: speedup netns create/delete time", "Date": "Tue, 19 Sep 2017 16:27:02 -0700", "Message-Id": "<20170919232709.14690-1-edumazet@google.com>", "X-Mailer": "git-send-email 2.14.1.690.gbb1197296e-goog", "Sender": "netdev-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<netdev.vger.kernel.org>", "X-Mailing-List": "netdev@vger.kernel.org" }, "content": "When rate of netns creation/deletion is high enough,\nwe observe softlockups in cleanup_net() caused by huge list\nof netns and way too many rcu_barrier() calls.\n\nThis patch series does some optimizations in kobject,\nand add batching to tunnels so that netns dismantles are\nless costly.\n\nIPv6 addrlabels also get a per netns list, and tcp_metrics\nalso benefit from batch flushing.\n\nThis gives me one order of magnitude gain.\n(~50 ms -> ~5 ms for one netns create/delete pair)\n\nTested:\n\nfor i in `seq 1 40`\ndo\n (for j in `seq 1 100` ; do unshare -n /bin/true >/dev/null ; done) &\ndone\nwait ; grep net_namespace /proc/slabinfo\n\nBefore patch series :\n\n$ time ./add_del_unshare.sh\nnet_namespace 116 258 5504 1 2 : tunables 8 4 0 : slabdata 116 258 0\n\nreal\t3m24.910s\nuser\t0m0.747s\nsys\t0m43.162s\n\nAfter :\n$ time ./add_del_unshare.sh\nnet_namespace 135 291 5504 1 2 : tunables 8 4 0 : slabdata 135 291 0\n\nreal\t0m22.117s\nuser\t0m0.728s\nsys\t0m35.328s\n\n\nEric Dumazet (7):\n kobject: add kobject_uevent_net_broadcast()\n kobject: copy env blob in one go\n kobject: factorize skb setup in kobject_uevent_net_broadcast()\n ipv6: addrlabel: per netns list\n tcp: batch tcp_net_metrics_exit\n ipv6: speedup ipv6 tunnels dismantle\n ipv4: speedup ipv6 tunnels dismantle\n\n include/net/ip_tunnels.h | 3 +-\n include/net/netns/ipv6.h | 5 +++\n lib/kobject_uevent.c | 94 ++++++++++++++++++++++++++----------------------\n net/ipv4/ip_gre.c | 22 +++++-------\n net/ipv4/ip_tunnel.c | 12 +++++--\n net/ipv4/ip_vti.c | 7 ++--\n net/ipv4/ipip.c | 7 ++--\n net/ipv4/tcp_metrics.c | 14 +++++---\n net/ipv6/addrlabel.c | 81 ++++++++++++++++-------------------------\n net/ipv6/ip6_gre.c | 8 +++--\n net/ipv6/ip6_tunnel.c | 20 ++++++-----\n net/ipv6/ip6_vti.c | 23 +++++++-----\n net/ipv6/sit.c | 9 +++--\n 13 files changed, 157 insertions(+), 148 deletions(-)" }