From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965322AbcFMJyJ (ORCPT ); Mon, 13 Jun 2016 05:54:09 -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 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,466,1459839600"; d="scan'208";a="996446984" 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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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; -- 1.9.1