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 X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 468F3C072B1 for ; Thu, 30 May 2019 06:57:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 251DE247CC for ; Thu, 30 May 2019 06:57:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727614AbfE3G5v (ORCPT ); Thu, 30 May 2019 02:57:51 -0400 Received: from out30-45.freemail.mail.aliyun.com ([115.124.30.45]:48610 "EHLO out30-45.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbfE3G5v (ORCPT ); Thu, 30 May 2019 02:57:51 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R141e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=yang.shi@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0TT.K-Od_1559199467; Received: from US-143344MP.local(mailfrom:yang.shi@linux.alibaba.com fp:SMTPD_---0TT.K-Od_1559199467) by smtp.aliyun-inc.com(127.0.0.1); Thu, 30 May 2019 14:57:47 +0800 To: Mel Gorman , Michal Hocko , Andrew Morton Cc: "linux-mm@kvack.org" , linux-kernel From: Yang Shi Subject: [HELP] How to get task_struct from mm Message-ID: <5cf71366-ba01-8ef0-3dbd-c9fec8a2b26f@linux.alibaba.com> Date: Thu, 30 May 2019 14:57:46 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi folks, As what we discussed about page demotion for PMEM at LSF/MM, the demotion should respect to the mempolicy and allowed mems of the process which the page (anonymous page only for now) belongs to. The vma that the page is mapped to can be retrieved from rmap walk easily, but we need know the task_struct that the vma belongs to. It looks there is not such API, and container_of seems not work with pointer member. Any suggestion? Thanks, Yang