From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31F38C433F5 for ; Mon, 11 Oct 2021 08:14:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1154E60E9C for ; Mon, 11 Oct 2021 08:14:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234888AbhJKIQV (ORCPT ); Mon, 11 Oct 2021 04:16:21 -0400 Received: from szxga03-in.huawei.com ([45.249.212.189]:24235 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231300AbhJKIQT (ORCPT ); Mon, 11 Oct 2021 04:16:19 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.53]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4HSWkx3fKQzQj9t; Mon, 11 Oct 2021 16:13:13 +0800 (CST) Received: from dggpeml500005.china.huawei.com (7.185.36.59) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Mon, 11 Oct 2021 16:14:18 +0800 Received: from [10.174.178.155] (10.174.178.155) by dggpeml500005.china.huawei.com (7.185.36.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.8; Mon, 11 Oct 2021 16:14:17 +0800 To: , , , CC: , , , , , , , , "David Hildenbrand" , , "Wangkefeng (OS Kernel Lab)" From: Yongqiang Liu Subject: [QUESTION] ltp: mavise06 failed when the task scheduled to another cpu Message-ID: <5ed4bc3d-9c30-8cae-e826-b2d0c37c2f6e@huawei.com> Date: Mon, 11 Oct 2021 16:14:16 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.178.155] X-ClientProxiedBy: dggeme720-chm.china.huawei.com (10.1.199.116) To dggpeml500005.china.huawei.com (7.185.36.59) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, when runing this case in 5.10-lts kernel, it will trigger the folloing failure:  ......     madvise06.c:74: TINFO:  memory.kmem.usage_in_bytes: 1752 Kb     madvise06.c:208: TPASS: more than 102400 Kb were moved to the swap cache     madvise06.c:217: TINFO: PageFault(madvice / no mem access): 102401     madvise06.c:221: TINFO: PageFault(madvice / mem access): 102417     madvise06.c:82: TINFO: After page access     madvise06.c:84: TINFO:  Swap: 307372 Kb     madvise06.c:86: TINFO:  SwapCached: 101820 Kb     madvise06.c:88: TINFO:  Cached: 103004Kb     madvise06.c:74: TINFO:  memory.kmem.usage_in_bytes: 0Kb     madvise06.c:225: TFAIL: 16 pages were faulted out of 2 max and we found that when we call the madvise the task was scheduled to another cpu: ...... tst_res(TINFO, "before madvise MEMLIMIT CPU:%d", sched_getcpu());--->cpu0 TEST(madvise(target, MEM_LIMIT, MADV_WILLNEED)); tst_res(TINFO, "after madvise MEMLIMIT CPU:%d", sched_getcpu());--->cpu1 ...... tst_res(TINFO, "before madvise PASS_THRESHOLDCPU:%d", sched_getcpu());-->cpu1 TEST(madvise(target, PASS_THRESHOLD, MADV_WILLNEED)); tst_res(TINFO, "after madvise PASS_THRESHOLDCPU:%d", sched_getcpu());-->cpu0 ..... Is the PERCPU data swap_slot was not handled well? with the following patch almost fix the error: e9b9734b7465 sched/fair: Reduce cases for active balance 8a41dfcda7a3 sched/fair: Don't set LBF_ALL_PINNED unnecessarily fc488ffd4297 sched/fair: Skip idle cfs_rq but bind the task to a cpu also can solve this problem. Kind regards,