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{ "id": 816310, "url": "http://patchwork.ozlabs.org/api/covers/816310/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/cover/cover.1505920769.git.joseph.salisbury@canonical.com/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<cover.1505920769.git.joseph.salisbury@canonical.com>", "list_archive_url": null, "date": "2017-09-20T15:32:22", "name": "[SRU,Zesty,0/1] sched/fair: Prefer sibiling only if local group is under-utilized", "submitter": { "id": 7793, "url": "http://patchwork.ozlabs.org/api/people/7793/?format=api", "name": "Joseph Salisbury", "email": "joseph.salisbury@canonical.com" }, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/cover/cover.1505920769.git.joseph.salisbury@canonical.com/mbox/", "series": [], "comments": "http://patchwork.ozlabs.org/api/covers/816310/comments/", "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.ubuntu.com\n\t(client-ip=91.189.94.19; helo=huckleberry.canonical.com;\n\tenvelope-from=kernel-team-bounces@lists.ubuntu.com;\n\treceiver=<UNKNOWN>)", "Received": [ "from huckleberry.canonical.com (huckleberry.canonical.com\n\t[91.189.94.19])\n\tby ozlabs.org (Postfix) with ESMTP id 3xy3dq2YZPz9s8J;\n\tThu, 21 Sep 2017 01:32:31 +1000 (AEST)", "from localhost ([127.0.0.1] helo=huckleberry.canonical.com)\n\tby huckleberry.canonical.com with esmtp (Exim 4.86_2)\n\t(envelope-from <kernel-team-bounces@lists.ubuntu.com>)\n\tid 1dugzB-0007bJ-UJ; Wed, 20 Sep 2017 15:32:25 +0000", "from youngberry.canonical.com ([91.189.89.112])\n\tby huckleberry.canonical.com with esmtps\n\t(TLS1.0:DHE_RSA_AES_128_CBC_SHA1:128)\n\t(Exim 4.86_2) (envelope-from <joseph.salisbury@canonical.com>)\n\tid 1dugzA-0007af-HQ\n\tfor kernel-team@lists.ubuntu.com; Wed, 20 Sep 2017 15:32:24 +0000", "from 1.general.jsalisbury.us.vpn ([10.172.67.212] helo=salisbury)\n\tby youngberry.canonical.com with esmtpsa\n\t(TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.76) (envelope-from <joseph.salisbury@canonical.com>)\n\tid 1dugzA-00037p-7b\n\tfor kernel-team@lists.ubuntu.com; Wed, 20 Sep 2017 15:32:24 +0000", "by salisbury (Postfix, from userid 1000)\n\tid 3AA0C7E2809; Wed, 20 Sep 2017 11:32:23 -0400 (EDT)" ], "From": "Joseph Salisbury <joseph.salisbury@canonical.com>", "To": "kernel-team@lists.ubuntu.com", "Subject": "[SRU][Zesty][PATCH 0/1] sched/fair: Prefer sibiling only if local\n\tgroup is under-utilized", "Date": "Wed, 20 Sep 2017 11:32:22 -0400", "Message-Id": "<cover.1505920769.git.joseph.salisbury@canonical.com>", "X-Mailer": "git-send-email 2.7.4", "X-BeenThere": "kernel-team@lists.ubuntu.com", "X-Mailman-Version": "2.1.20", "Precedence": "list", "List-Id": "Kernel team discussions <kernel-team.lists.ubuntu.com>", "List-Unsubscribe": "<https://lists.ubuntu.com/mailman/options/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe>", "List-Archive": "<https://lists.ubuntu.com/archives/kernel-team>", "List-Post": "<mailto:kernel-team@lists.ubuntu.com>", "List-Help": "<mailto:kernel-team-request@lists.ubuntu.com?subject=help>", "List-Subscribe": "<https://lists.ubuntu.com/mailman/listinfo/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "BugLink: http://bugs.launchpad.net/bugs/1713576\n\n== SRU Justification ==\nThere is a significantly higher number of task migrations when the load is \nfixed and not balanced across cores. \n\nBenchmark results are posted in the bug description and in the commits git log. \n\nThis bug is resolved by mainline commit 05b40e057734811ce452344fb3690d09965a7b6a, which is \nin mailine as of 4.12-rc1.\n\n \n== Fix ==\ncommit 05b40e057734811ce452344fb3690d09965a7b6a\nAuthor: Srikar Dronamraju <srikar@linux.vnet.ibm.com>\nDate: Wed Mar 22 23:27:50 2017 +0530\n\n sched/fair: Prefer sibiling only if local group is under-utilized\n\n== Regression Potential ==\nMedium, since this commit does touch the scheduler. However, the commit only makes a change to \nallow a local group to pull a task, if the source group has more number of \ntasks than the local group.\n\n== Test Case ==\nA test kernel was built with this patch and tested by the original bug reporter.\nThe bug reporter states the test kernel resolved the bug.\n\nSrikar Dronamraju (1):\n sched/fair: Prefer sibiling only if local group is under-utilized\n\n kernel/sched/fair.c | 7 ++++---\n 1 file changed, 4 insertions(+), 3 deletions(-)" }