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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48E5BCCA480 for ; Fri, 8 Jul 2022 21:05:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240416AbiGHVFR (ORCPT ); Fri, 8 Jul 2022 17:05:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240405AbiGHVFP (ORCPT ); Fri, 8 Jul 2022 17:05:15 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFE40A025A for ; Fri, 8 Jul 2022 14:05:10 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8D488628E1 for ; Fri, 8 Jul 2022 21:05:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB674C341C0; Fri, 8 Jul 2022 21:05:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1657314310; bh=w0JVjaATOQH+zJxeDV67tx8Jt8V9XhM8rP+c20gOyk4=; h=Date:To:From:Subject:From; b=a2Q+LV8CaC+S7JGJrTXJiT3rtt5zzt68yyMhjrlMHeWOfz4WukQANcbCRSCYj2z0y 9eYRwF8IiphS2DUmFH0cBlUtnPceMdREcgMy9yciKdJX0TqGcBqYxiecjsz5CQoS0f IxZyec+5zZHoVFCCEs/Wlo8Ke8yJS9ir0a59W/8U= Date: Fri, 08 Jul 2022 14:05:09 -0700 To: mm-commits@vger.kernel.org, ziy@nvidia.com, willy@infradead.org, vbabka@suse.cz, tsbogend@alpha.franken.de, songliubraving@fb.com, sj@kernel.org, shy828301@gmail.com, rongwei.wang@linux.alibaba.com, rientjes@google.com, peterx@redhat.com, pasha.tatashin@soleen.com, minchan@kernel.org, mhocko@suse.com, mattst88@gmail.com, linmiaohe@huawei.com, kirill.shutemov@linux.intel.com, jcmvbkbc@gmail.com, James.Bottomley@HansenPartnership.com, ink@jurassic.park.msu.ru, hughd@google.com, deller@gmx.de, david@redhat.com, ckennelly@google.com, chris@zankel.net, axelrasmussen@google.com, axboe@kernel.dk, asml.silence@gmail.com, arnd@arndb.de, alex.shi@linux.alibaba.com, aarcange@redhat.com, zokeefe@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-madvise-add-madv_collapse-to-process_madvise.patch added to mm-unstable branch Message-Id: <20220708210509.DB674C341C0@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm/madvise: add MADV_COLLAPSE to process_madvise() has been added to the -mm mm-unstable branch. Its filename is mm-madvise-add-madv_collapse-to-process_madvise.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-madvise-add-madv_collapse-to-process_madvise.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: "Zach O'Keefe" Subject: mm/madvise: add MADV_COLLAPSE to process_madvise() Date: Wed, 6 Jul 2022 16:59:30 -0700 Allow MADV_COLLAPSE behavior for process_madvise(2) if caller has CAP_SYS_ADMIN or is requesting collapse of it's own memory. This is useful for the development of userspace agents that seek to optimize THP utilization system-wide by using userspace signals to prioritize what memory is most deserving of being THP-backed. Link: https://lkml.kernel.org/r/20220706235936.2197195-13-zokeefe@google.com Signed-off-by: Zach O'Keefe Acked-by: David Rientjes Cc: Alex Shi Cc: Andrea Arcangeli Cc: Arnd Bergmann Cc: Axel Rasmussen Cc: Chris Kennelly Cc: Chris Zankel Cc: David Hildenbrand Cc: Helge Deller Cc: Hugh Dickins Cc: Ivan Kokshaysky Cc: James Bottomley Cc: Jens Axboe Cc: "Kirill A. Shutemov" Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Miaohe Lin Cc: Michal Hocko Cc: Minchan Kim Cc: Pasha Tatashin Cc: Pavel Begunkov Cc: Peter Xu Cc: Rongwei Wang Cc: SeongJae Park Cc: Song Liu Cc: Thomas Bogendoerfer Cc: Vlastimil Babka Cc: Yang Shi Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/madvise.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/mm/madvise.c~mm-madvise-add-madv_collapse-to-process_madvise +++ a/mm/madvise.c @@ -1171,13 +1171,15 @@ madvise_behavior_valid(int behavior) } static bool -process_madvise_behavior_valid(int behavior) +process_madvise_behavior_valid(int behavior, struct task_struct *task) { switch (behavior) { case MADV_COLD: case MADV_PAGEOUT: case MADV_WILLNEED: return true; + case MADV_COLLAPSE: + return task == current || capable(CAP_SYS_ADMIN); default: return false; } @@ -1455,7 +1457,7 @@ SYSCALL_DEFINE5(process_madvise, int, pi goto free_iov; } - if (!process_madvise_behavior_valid(behavior)) { + if (!process_madvise_behavior_valid(behavior, task)) { ret = -EINVAL; goto release_task; } _ Patches currently in -mm which might be from zokeefe@google.com are mm-khugepaged-remove-redundant-transhuge_vma_suitable-check.patch mm-khugepaged-add-struct-collapse_control.patch mm-khugepaged-dedup-and-simplify-hugepage-alloc-and-charging.patch mm-khugepaged-pipe-enum-scan_result-codes-back-to-callers.patch mm-khugepaged-add-flag-to-predicate-khugepaged-only-behavior.patch mm-thp-add-flag-to-enforce-sysfs-thp-in-hugepage_vma_check.patch mm-khugepaged-record-scan_pmd_mapped-when-scan_pmd-finds-hugepage.patch mm-madvise-introduce-madv_collapse-sync-hugepage-collapse.patch mm-khugepaged-rename-prefix-of-shared-collapse-functions.patch mm-madvise-add-huge_memory-mm_madvise_collapse-tracepoint.patch mm-madvise-add-madv_collapse-to-process_madvise.patch proc-smaps-add-pmdmappable-field-to-smaps.patch selftests-vm-modularize-collapse-selftests.patch selftests-vm-dedup-hugepage-allocation-logic.patch selftests-vm-add-madv_collapse-collapse-context-to-selftests.patch selftests-vm-add-selftest-to-verify-recollapse-of-thps.patch selftests-vm-add-selftest-to-verify-multi-thp-collapse.patch