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 0CB56C2BA83 for ; Fri, 14 Feb 2020 17:05:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9193520656 for ; Fri, 14 Feb 2020 17:05:43 +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="PG+iPDIX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9193520656 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 0E9696B0644; Fri, 14 Feb 2020 12:05:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0726E6B0645; Fri, 14 Feb 2020 12:05:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E7D436B0646; Fri, 14 Feb 2020 12:05:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id C93866B0644 for ; Fri, 14 Feb 2020 12:05:42 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 74C15180AD807 for ; Fri, 14 Feb 2020 17:05:42 +0000 (UTC) X-FDA: 76489359324.07.pot06_890bea9c4ee09 X-HE-Tag: pot06_890bea9c4ee09 X-Filterd-Recvd-Size: 7744 Received: from mail-pj1-f67.google.com (mail-pj1-f67.google.com [209.85.216.67]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Fri, 14 Feb 2020 17:05:41 +0000 (UTC) Received: by mail-pj1-f67.google.com with SMTP id dw13so4111248pjb.4 for ; Fri, 14 Feb 2020 09:05:41 -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=DNlByY054icvI6mdU8f/7zppc96H8+Hj/ekQYXNSLtg=; b=PG+iPDIXxskkfRMUJ5ywooQu/7tHQ1k/SbkMSTelZdJJeTH0qzLSJkj+/qtsJzLqdr S3D3du4ZMClP79gCmH6VSQSPbbZigTC+l5VqHDNKWrELIJxIT6eNruvuM9alnMAZndw2 6x+u3omu+FlPlk9VkvEcK/PMhps3ZQS8xDr9nok8CQnEEYcWAjXJAcdgHwbfa4IZQafP Co1xKRyGEodbKPlyK3W9i/B2x5xd3KmLjPamuSYPWlOQJHGwX9ashaFJX+Eggk65H+CL bopnx+uS8t+WMMpJ0IE+FtB2Zm3oGgKHCbCZidQPVKoI1nUK7EFQQONb1iYi1PH6LMTZ l7pg== 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=DNlByY054icvI6mdU8f/7zppc96H8+Hj/ekQYXNSLtg=; b=h7dUoq0O0Z8+TAX/daYroSyoppAKyAV2bpeeIDcEvMZQCHPi4JpD/GJKPZ9BBrt+iP ilW07akEySqImOs3eaNx3fIztA+YZL+l+h8u829MPB4lacfgDGwzeHKMgRroxAnr/Sdr OIGZebBJu6DX+eQrw1bn5cLaXcpH7ULYaA2VSaqekk2FK71iG3umxU7YHt35JI31fBSc jb0f28llFLHhKts6TSZMhKO5ksVcuG7kaifEkrbiUimZhs164Gum+b0gRSXooe0Qjf5w SwFm+aVP5LSdqxnNeMaM850SM1KBWL4Ko7MmbtXgvHz8oxhdB34uiToh8+YXE7dgfnQF nbTg== X-Gm-Message-State: APjAAAXxu7vjIySBJwR6AslzdYXBpswuBN/ytykA8h7unszehVYeuJSY yJTc99tb2pPFM4wVT5cBR88= X-Google-Smtp-Source: APXvYqwVi2UegPb1oX4Cfj9nK1b3+YMr3+jpWlK6EWbFDOQEPfELPcREZMhSMA5sDOLmJmNAcaykfg== X-Received: by 2002:a17:90a:c708:: with SMTP id o8mr4872545pjt.104.1581699940461; Fri, 14 Feb 2020 09:05:40 -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 a13sm7662924pfg.65.2020.02.14.09.05.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Feb 2020 09:05:34 -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 , sj38.park@gmail.com, alexander.h.duyck@linux.intel.com, Jann Horn , Minchan Kim Subject: [PATCH v5 0/7] introduce memory hinting API for external process Date: Fri, 14 Feb 2020 09:05:13 -0800 Message-Id: <20200214170520.160271-1-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. Minchan Kim (6): mm: pass task to do_madvise mm: introduce external memory hinting API mm: validate mm in do_madvise mm: check fatal signal pending of target process pid: export pidfd_get_pid 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 * 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: export pidfd_get_pid 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 | 142 ++++++++++++++++---- 26 files changed, 165 insertions(+), 44 deletions(-) --=20 2.25.0.265.gbab2e86ba0-goog