From patchwork Mon Jun 13 09:47:12 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9172495 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6B87E6075D for ; Mon, 13 Jun 2016 09:54:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5BBF8200F5 for ; Mon, 13 Jun 2016 09:54:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4F04920855; Mon, 13 Jun 2016 09:54:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EFBA8200F5 for ; Mon, 13 Jun 2016 09:54:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965240AbcFMJyI (ORCPT ); Mon, 13 Jun 2016 05:54:08 -0400 Received: from mga04.intel.com ([192.55.52.120]:7050 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965115AbcFMJxk (ORCPT ); Mon, 13 Jun 2016 05:53:40 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP; 13 Jun 2016 02:53:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,466,1459839600"; d="scan'208";a="996446984" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga002.jf.intel.com with ESMTP; 13 Jun 2016 02:53:38 -0700 From: Liang Li To: kvm@vger.kernel.org Cc: virtio-dev@lists.oasis-open.org, qemu-devel@nongun.org, linux-kernel@vger.kernel.org, mst@redhat.com, Liang Li , Paolo Bonzini , Cornelia Huck , Amit Shah Subject: [PATCH 5/6] mm: add the related functions to get free page info Date: Mon, 13 Jun 2016 17:47:12 +0800 Message-Id: <1465811233-21136-6-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465811233-21136-1-git-send-email-liang.z.li@intel.com> References: <1465811233-21136-1-git-send-email-liang.z.li@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Save the free page info into a page bitmap, will be used in virtio balloon device driver. Signed-off-by: Liang Li Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah --- mm/page_alloc.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6903b69..96b408f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4515,6 +4515,46 @@ void show_free_areas(unsigned int filter) show_swap_cache_info(); } +unsigned long get_max_pfn(void) +{ + return max_pfn; +} +EXPORT_SYMBOL(get_max_pfn); + +static void mark_free_pages_bitmap(struct zone *zone, + unsigned long *bitmap, unsigned long len) +{ + unsigned long pfn, flags, limit, page_num; + unsigned int order, t; + struct list_head *curr; + + if (zone_is_empty(zone)) + return; + + spin_lock_irqsave(&zone->lock, flags); + + limit = min(len, max_pfn); + for_each_migratetype_order(order, t) { + list_for_each(curr, &zone->free_area[order].free_list[t]) { + pfn = page_to_pfn(list_entry(curr, struct page, lru)); + page_num = 1UL << order; + if (pfn + page_num < limit) + bitmap_set(bitmap, pfn, page_num); + } + } + + spin_unlock_irqrestore(&zone->lock, flags); +} + +void get_free_pages(unsigned long *bitmap, unsigned long len) +{ + struct zone *zone; + + for_each_populated_zone(zone) + mark_free_pages_bitmap(zone, bitmap, len); +} +EXPORT_SYMBOL(get_free_pages); + static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) { zoneref->zone = zone;