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 2BB52C32774 for ; Mon, 22 Aug 2022 19:22:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238014AbiHVTWX (ORCPT ); Mon, 22 Aug 2022 15:22:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237609AbiHVTVP (ORCPT ); Mon, 22 Aug 2022 15:21:15 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5743638AE for ; Mon, 22 Aug 2022 12:21:14 -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 sin.source.kernel.org (Postfix) with ESMTPS id 9D78CCE16DE for ; Mon, 22 Aug 2022 19:21:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2A6CC433D6; Mon, 22 Aug 2022 19:21:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1661196069; bh=6OKLYcW8/jkQFpd09ztzV3ku3U5PoBwQvosdI/uGdL0=; h=Date:To:From:Subject:From; b=mCgjAbbmIULcvKYDrZJzchSLfQzj+fIwE13dJjUcfF3AQsy4oKX5U+i9ZOiOx9+5M cCxHFi5RdkqHOvKGoNhtkjj07yuO8Evp/laMxN+N+zZqoAZQfcyAHyzttKFgfW77xu b7CuOGrhaA6cKdoY026Apj0DoKASkcH5l5PyIOCI= Date: Mon, 22 Aug 2022 12:21:08 -0700 To: mm-commits@vger.kernel.org, yuzhao@google.com, will@kernel.org, vbabka@suse.cz, svens@linux.ibm.com, sj@kernel.org, Liam.Howlett@Oracle.com, dhowells@redhat.com, david@redhat.com, catalin.marinas@arm.com, willy@infradead.org, akpm@linux-foundation.org From: Andrew Morton Subject: + acct-use-vma-iterator-instead-of-linked-list.patch added to mm-unstable branch Message-Id: <20220822192109.A2A6CC433D6@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: acct: use VMA iterator instead of linked list has been added to the -mm mm-unstable branch. Its filename is acct-use-vma-iterator-instead-of-linked-list.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/acct-use-vma-iterator-instead-of-linked-list.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: "Matthew Wilcox (Oracle)" Subject: acct: use VMA iterator instead of linked list Date: Mon, 22 Aug 2022 15:06:26 +0000 The VMA iterator is faster than the linked list. Link: https://lkml.kernel.org/r/20220822150128.1562046-47-Liam.Howlett@oracle.com Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Liam R. Howlett Acked-by: Vlastimil Babka Cc: Catalin Marinas Cc: David Hildenbrand Cc: David Howells Cc: SeongJae Park Cc: Sven Schnelle Cc: Will Deacon Cc: Yu Zhao Signed-off-by: Andrew Morton --- kernel/acct.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) --- a/kernel/acct.c~acct-use-vma-iterator-instead-of-linked-list +++ a/kernel/acct.c @@ -555,15 +555,14 @@ void acct_collect(long exitcode, int gro unsigned long vsize = 0; if (group_dead && current->mm) { + struct mm_struct *mm = current->mm; + VMA_ITERATOR(vmi, mm, 0); struct vm_area_struct *vma; - mmap_read_lock(current->mm); - vma = current->mm->mmap; - while (vma) { + mmap_read_lock(mm); + for_each_vma(vmi, vma) vsize += vma->vm_end - vma->vm_start; - vma = vma->vm_next; - } - mmap_read_unlock(current->mm); + mmap_read_unlock(mm); } spin_lock_irq(¤t->sighand->siglock); _ Patches currently in -mm which might be from willy@infradead.org are support-highmem-pages-in-vmap_pages_range_noflush.patch mm-add-vma-iterator.patch mmap-use-the-vma-iterator-in-count_vma_pages_range.patch proc-remove-vma-rbtree-use-from-nommu.patch arm64-remove-mmap-linked-list-from-vdso.patch parisc-remove-mmap-linked-list-from-cache-handling.patch powerpc-remove-mmap-linked-list-walks.patch s390-remove-vma-linked-list-walks.patch x86-remove-vma-linked-list-walks.patch xtensa-remove-vma-linked-list-walks.patch cxl-remove-vma-linked-list-walk.patch optee-remove-vma-linked-list-walk.patch um-remove-vma-linked-list-walk.patch coredump-remove-vma-linked-list-walk.patch exec-use-vma-iterator-instead-of-linked-list.patch fs-proc-task_mmu-stop-using-linked-list-and-highest_vm_end.patch acct-use-vma-iterator-instead-of-linked-list.patch perf-use-vma-iterator.patch sched-use-maple-tree-iterator-to-walk-vmas.patch fork-use-vma-iterator.patch mm-khugepaged-stop-using-vma-linked-list.patch mm-ksm-use-vma-iterators-instead-of-vma-linked-list.patch mm-mlock-use-vma-iterator-and-maple-state-instead-of-vma-linked-list.patch mm-pagewalk-use-vma_find-instead-of-vma-linked-list.patch i915-use-the-vma-iterator.patch nommu-remove-uses-of-vma-linked-list.patch