From patchwork Fri Sep 30 14:19:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12995517 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11BC4C433FE for ; Fri, 30 Sep 2022 14:20:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A41366B0078; Fri, 30 Sep 2022 10:20:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9CA8E8D0003; Fri, 30 Sep 2022 10:20:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 81DA48D0002; Fri, 30 Sep 2022 10:20:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 6C5806B0078 for ; Fri, 30 Sep 2022 10:20:36 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 2F6ADABF26 for ; Fri, 30 Sep 2022 14:20:36 +0000 (UTC) X-FDA: 79968962472.20.6FF99FC Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf26.hostedemail.com (Postfix) with ESMTP id BFDF5140021 for ; Fri, 30 Sep 2022 14:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664547634; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5Os3ebntrNckY9ikYeoLSgVh4tT4cYPUxPafC1slc+E=; b=agUYkZXHcYsfF7Wsa/RAZkhDCUvIPfqMKi9JGJeCRwA62L+0LcRq+7hpyqcUEipR8fcPIp Yb4aFSYwAPdsahWQoxVkxPARfsigLIy1COPFaqgYeHCExEf0xHK+F4dWXez0p40bExVeLU tBRrmIazGPWTLk/i7rxlhfWMkIjjPjs= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-168-gjvSGRHeOl-RFUWtXhoFUQ-1; Fri, 30 Sep 2022 10:20:33 -0400 X-MC-Unique: gjvSGRHeOl-RFUWtXhoFUQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C1544101E150; Fri, 30 Sep 2022 14:20:32 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id 92C461121315; Fri, 30 Sep 2022 14:20:30 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, David Hildenbrand , Andrew Morton , Shuah Khan , Hugh Dickins , Vlastimil Babka , Peter Xu , Andrea Arcangeli , "Matthew Wilcox (Oracle)" , Jason Gunthorpe , John Hubbard Subject: [PATCH v1 5/7] mm/pagewalk: add walk_page_range_vma() Date: Fri, 30 Sep 2022 16:19:29 +0200 Message-Id: <20220930141931.174362-6-david@redhat.com> In-Reply-To: <20220930141931.174362-1-david@redhat.com> References: <20220930141931.174362-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664547635; a=rsa-sha256; cv=none; b=5r0kfO20siYI2aweM/71jwihNQ3Qm1xWBE5YvIMjPAUUWOf3KNeH7rEWr/LNEozXvolQcH WAhDDO2tJYsobj7KlMG1Fq7zQJBVCH7YuEHY7aUuO9y8AciVtE3Eyhi6zmVJdZjuIqHTEb Vg7WWCVTPQYpuKWomI6K4P5tPDpVdyA= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=agUYkZXH; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf26.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664547635; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=5Os3ebntrNckY9ikYeoLSgVh4tT4cYPUxPafC1slc+E=; b=JN5B93hjLF+JxZQW0MCpP9l+23edAWh4TtonIRP+V2f9jOY8bIDS33MQ132/gWyLElgpta JueNZHeGARzL6wu6UWaaCgd3U9NPaLmUxTdZA5L3v4By/RFyo4hdTFt2ZZGjI9WAfEG8Li rdn4VW51aenWZyro8HgrFQq+u84EvbM= X-Stat-Signature: axkijw43nnusspxxdeui35kns8fqb318 X-Rspamd-Queue-Id: BFDF5140021 X-Rspamd-Server: rspam04 Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=agUYkZXH; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf26.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com X-Rspam-User: X-HE-Tag: 1664547635-23538 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: Let's add walk_page_range_vma(), which is similar to walk_page_vma(), however, is only interested in a subset of the VMA range. To be used in KSM code to stop using follow_page() next. Signed-off-by: David Hildenbrand --- include/linux/pagewalk.h | 3 +++ mm/pagewalk.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h index f3fafb731ffd..2f8f6cc980b4 100644 --- a/include/linux/pagewalk.h +++ b/include/linux/pagewalk.h @@ -99,6 +99,9 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, unsigned long end, const struct mm_walk_ops *ops, pgd_t *pgd, void *private); +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private); int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private); int walk_page_mapping(struct address_space *mapping, pgoff_t first_index, diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 131b2b335b2c..757c075da231 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -514,6 +514,33 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, return __walk_page_range(start, end, &walk); } +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private) +{ + struct mm_walk walk = { + .ops = ops, + .mm = vma->vm_mm, + .vma = vma, + .private = private, + }; + int err; + + if (start >= end || !walk.mm) + return -EINVAL; + if (start < vma->vm_start || end > vma->vm_end) + return -EINVAL; + + mmap_assert_locked(walk.mm); + + err = walk_page_test(start, end, &walk); + if (err > 0) + return 0; + if (err < 0) + return err; + return __walk_page_range(start, end, &walk); +} + int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private) {