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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 53D43C3F2CD for ; Mon, 2 Mar 2020 19:36:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0FEB12080C for ; Mon, 2 Mar 2020 19:36:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="pUVh3p06" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0FEB12080C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9ECED6B0003; Mon, 2 Mar 2020 14:36:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 99D8C6B0005; Mon, 2 Mar 2020 14:36:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 88C876B0006; Mon, 2 Mar 2020 14:36:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0133.hostedemail.com [216.40.44.133]) by kanga.kvack.org (Postfix) with ESMTP id 721EE6B0003 for ; Mon, 2 Mar 2020 14:36:42 -0500 (EST) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 39733160C3 for ; Mon, 2 Mar 2020 19:36:42 +0000 (UTC) X-FDA: 76551429444.02.bears33_74affd5b35205 X-HE-Tag: bears33_74affd5b35205 X-Filterd-Recvd-Size: 7795 Received: from mail-pf1-f196.google.com (mail-pf1-f196.google.com [209.85.210.196]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Mon, 2 Mar 2020 19:36:41 +0000 (UTC) Received: by mail-pf1-f196.google.com with SMTP id n7so218214pfn.0 for ; Mon, 02 Mar 2020 11:36:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=kMbLmFmNY35d4+zrcJ8Avt+7fb1SsJEUi6gGO52WjWM=; b=pUVh3p06Aoy9RRjjq34SFPs3RDs/FzYH69zh3n/FTfYt4cekg/L3kDChQKj/3M4mV+ 2nVUAWk7A4aSemBgcQlUqi66yqReBaGo7nPgRkL24RslGjF/u9bqQuqRmhrulJM7HEmm vcYrtrvyHvD2bCp1w2FwTgD0OENMZdVu/USGlZ4AQBjAH82xb6Q+tOi4JPEwPJAnwsKc oAThkgchJPGnT0OV2KxRy31qlWtXSbxP4c84Vz0WOz4o6SZK6gGEwaSvp8+EY4X76zTD BOIaJhrHjd/n7RoATCDRYoyX43h+op6375Qw/uicgaHPtNQ3D1kjU2/8Rav5wizf0qAz 2FWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=kMbLmFmNY35d4+zrcJ8Avt+7fb1SsJEUi6gGO52WjWM=; b=Jm1TdOXRq1PPnkeZLQ4qCedO5p/TrgXbNlNKVZpMDbfhdutR+/KWpoFVr3Xb7ykN0z mLysVgYlsZFDynp2PnpoX3KHhbs9dQVXbJS+5qXglKJImPtRMiNAQjm3ifUkd1d4e1Cf dYJGcAESm8MUS2eOWRd0sFjB4u7ZN/gY7KP0MLZiN0L+4ElCXSPs6Ah8vA7ORVajslNf dlhswkjd0LanbobYJktAAJKdbbiQHgS52/6soOP4wGjloGxVifI00trUn0Wt39bYJHjQ vRUCmedWw2EV2aJ4dZDLVpkhNph0IeHhufCpScuQ85rmSLq4iDCPwoK8wBuk0DYyeN+q 0iUw== X-Gm-Message-State: ANhLgQ3MUwaKk98ybxWUo5ldc22kdLdtDUSAKEYtXpRcCV/HYACnp294 jIEZ6cHYFr+k3oze80uhpp4= X-Google-Smtp-Source: ADFU+vvFSAjP3wLA8JL6Rsi8dQuGLmQfq9SZDJpyKlY+BZNzsfIB/vBgpw1uEf3g35MTcy+Ut7np3A== X-Received: by 2002:a62:ed0b:: with SMTP id u11mr563966pfh.46.1583177800544; Mon, 02 Mar 2020 11:36:40 -0800 (PST) Received: from bbox-1.mtv.corp.google.com ([2620:15c:211:1:3e01:2939:5992:52da]) by smtp.gmail.com with ESMTPSA id hg6sm35441pjb.22.2020.03.02.11.36.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Mar 2020 11:36:39 -0800 (PST) From: Minchan Kim To: Andrew Morton Cc: LKML , linux-mm , linux-api@vger.kernel.org, oleksandr@redhat.com, Suren Baghdasaryan , Tim Murray , Daniel Colascione , Sandeep Patil , Sonny Rao , Brian Geffon , Michal Hocko , Johannes Weiner , Shakeel Butt , John Dias , Joel Fernandes , Jann Horn , alexander.h.duyck@linux.intel.com, sj38.park@gmail.com, Minchan Kim Subject: [PATCH v7 0/7] introduce memory hinting API for external process Date: Mon, 2 Mar 2020 11:36:23 -0800 Message-Id: <20200302193630.68771-1-minchan@kernel.org> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Now, we have MADV_PAGEOUT and MADV_COLD as madvise hinting API. With that= , application could give hints to kernel what memory range are preferred to= be reclaimed. However, in some platform(e.g., Android), the information required to make the hinting decision is not known to the app. Instead, it is known to a centralized userspace daemon(e.g., ActivityMana= gerService), and that daemon must be able to initiate reclaim on its own without any a= pp involvement. To solve the concern, this patch introduces new syscall - process_madvise= (2). Bascially, it's same with madvise(2) syscall but it has some differences. 1. It needs pidfd of target process to provide the hint 2. It supports only MADV_{COLD|PAGEOUT|MERGEABLE|UNMEREABLE} at this mome= nt. Other hints in madvise will be opened when there are explicit requests= from community to prevent unexpected bugs we couldn't support. 3. Only privileged processes can do something for other process's address space. For more detail of the new API, please see "mm: introduce external memory= hinting API" description in this patchset. * from v6 - https://lore.kernel.org/linux-api/20200219014433.88424-1-minc= han@kernel.org/ * fix comments and descriptions - Suren * Add Reviewed-by - Suren * fix build break reported by 0-day * from v5 - https://lore.kernel.org/linux-mm/20200214170520.160271-1-minc= han@kernel.org/ * use null task and requestor's mm for io_madvise - Jann and Jens * use right commit description for moving pidfd_get_pid - Christoph * from v4 - https://lore.kernel.org/linux-mm/20200212233946.246210-1-minc= han@kernel.org/ * pass mm down to functions, not accessing task->mm - Jann * clean up - Alexander * add Reviewed-by - Alexander, SeongJae * patch reordering * from v3 - https://lore.kernel.org/linux-mm/20200128001641.5086-1-mincha= n@kernel.org/ * verify task->mm aftere access_mm - Oleg * split some patches for easy review - Alexander * clean up fatal signal checking - Suren * from v2 - https://lore.kernel.org/linux-mm/20200116235953.163318-1-minc= han@kernel.org/ * check signal callee and caller to bail out - Kirill Tkhai * put more clarification for justification of new API * from v1 - https://lore.kernel.org/linux-mm/20200110213433.94739-1-minch= an@kernel.org/ * fix syscall number - SeongJae * use get_pid_task - Kirill Tkhai * extend API to support pid as well as pidfd - Kirill Tkhai Minchan Kim (5): mm: pass task and mm to do_madvise mm: introduce external memory hinting API mm: check fatal signal pending of target process pid: move pidfd_get_pid function to pid.c mm: support both pid and pidfd for process_madvise Oleksandr Natalenko (2): mm/madvise: employ mmget_still_valid for write lock mm/madvise: allow KSM hints for remote API arch/alpha/kernel/syscalls/syscall.tbl | 1 + arch/arm/tools/syscall.tbl | 1 + arch/arm64/include/asm/unistd.h | 2 +- arch/arm64/include/asm/unistd32.h | 2 + arch/ia64/kernel/syscalls/syscall.tbl | 1 + arch/m68k/kernel/syscalls/syscall.tbl | 1 + arch/microblaze/kernel/syscalls/syscall.tbl | 1 + arch/mips/kernel/syscalls/syscall_n32.tbl | 1 + arch/mips/kernel/syscalls/syscall_n64.tbl | 1 + arch/parisc/kernel/syscalls/syscall.tbl | 1 + arch/powerpc/kernel/syscalls/syscall.tbl | 1 + arch/s390/kernel/syscalls/syscall.tbl | 1 + arch/sh/kernel/syscalls/syscall.tbl | 1 + arch/sparc/kernel/syscalls/syscall.tbl | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/xtensa/kernel/syscalls/syscall.tbl | 1 + fs/io_uring.c | 2 +- include/linux/mm.h | 3 +- include/linux/pid.h | 1 + include/linux/syscalls.h | 3 + include/uapi/asm-generic/unistd.h | 4 +- kernel/exit.c | 17 --- kernel/pid.c | 17 +++ kernel/sys_ni.c | 1 + mm/madvise.c | 144 ++++++++++++++++---- 26 files changed, 167 insertions(+), 44 deletions(-) --=20 2.25.0.265.gbab2e86ba0-goog