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 5404CC3B186 for ; Wed, 12 Feb 2020 23:39:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F349421734 for ; Wed, 12 Feb 2020 23:39:52 +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="FRvI5l7p" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F349421734 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 8A63D6B04CA; Wed, 12 Feb 2020 18:39:52 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 82F716B04CB; Wed, 12 Feb 2020 18:39:52 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6A9BD6B04CC; Wed, 12 Feb 2020 18:39:52 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0046.hostedemail.com [216.40.44.46]) by kanga.kvack.org (Postfix) with ESMTP id 4FF046B04CA for ; Wed, 12 Feb 2020 18:39:52 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 0CDFF2C2A for ; Wed, 12 Feb 2020 23:39:52 +0000 (UTC) X-FDA: 76483095024.04.honey38_732fdf2d8d02f X-HE-Tag: honey38_732fdf2d8d02f X-Filterd-Recvd-Size: 7093 Received: from mail-pg1-f193.google.com (mail-pg1-f193.google.com [209.85.215.193]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Wed, 12 Feb 2020 23:39:51 +0000 (UTC) Received: by mail-pg1-f193.google.com with SMTP id b9so1895420pgk.12 for ; Wed, 12 Feb 2020 15:39:51 -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=maCkSEFpOGFtAnibDn0I8ai2JTyywVBbgNcmf7oqPjw=; b=FRvI5l7pXfY+eb7PcI9dLXj2jZE2ViOj48HYHkHvl9gbl+eg9y7yYwPof96dHndGJ8 mVYDf7GIi2wOFnw0VDodP6JaRiYGLdfMwRVBP303xxccf2pB/Q9Rg+qxfC4kiZ4yMecb smnEMiD1aP5+EYX5Zif2IjRtsYE+pm7X75oetFwJffJZ6iQAAw5hCew6o2cyTwflGcmt w5qymEz1NowkqfxQ5vvxdfGBTE88jTMzVr13h3aKLE0X3xzNiAbodJ8ayH6RzWQZLdYt QAKIWlpOtVFowSygIoiMEadNzuRWVxDL113fFBDwCEh6sGMEv0/Kpe/fUFEzWhI8sQKz OyIA== 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=maCkSEFpOGFtAnibDn0I8ai2JTyywVBbgNcmf7oqPjw=; b=OOpYn2P/sVe6YXdzdSo4xaBs5SnKxHFdv/ZteCyCciwJV0TmQleY5aEG2lY88A5RVf ++dZ/J9UDCKZPCAJYmYYYI2/nSzh8kKJ+fu7Ow4Qrt9wp67ZodGGIDe6g7MZnCwBDF0e FfxCWBQx28xXTfy3tlDkfAv9fB6DNquYEQKxzAWdIOMpYNRmLleAnqYV2I60EToIX8qm MHml2Mu9ri9imfhlescwl0Wsdyh8LahfPJrlhJifjULSPW9qVhpBDJzt5Vp0Sy0lln1K 0w03sYeVnKQFaz/kUCKjSo7mS9C/urx5+Ey1HreiKND+6TZaqpgeawPaOq4PgzJ/lsqG jXbA== X-Gm-Message-State: APjAAAXeKWDmF7h1IiLIK3uqj5cjKS4fGDkSLuQdFu3WCGUBD4sN5A88 A4kHtmzckFAKewXZXbFp1SI= X-Google-Smtp-Source: APXvYqyOU7R1CIXlJxfxeSynAEoVQtBrKo+86izmUdz3lEWoFckBWfx1cL3tXyX9kMspcBQkuKCG4w== X-Received: by 2002:aa7:98c6:: with SMTP id e6mr10857499pfm.251.1581550790211; Wed, 12 Feb 2020 15:39:50 -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 k5sm296664pju.29.2020.02.12.15.39.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Feb 2020 15:39:49 -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 , Alexander Duyck , Minchan Kim Subject: [PATCH v4 0/8] introduce memory hinting API for external process Date: Wed, 12 Feb 2020 15:39:38 -0800 Message-Id: <20200212233946.246210-1-minchan@kernel.org> X-Mailer: git-send-email 2.25.0.225.g125e21ebc7-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 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 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 | 149 ++++++++++++++++---- 26 files changed, 170 insertions(+), 46 deletions(-) --=20 2.25.0.225.g125e21ebc7-goog