From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752810Ab2LKE4r (ORCPT ); Mon, 10 Dec 2012 23:56:47 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:48780 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751918Ab2LKE4q (ORCPT ); Mon, 10 Dec 2012 23:56:46 -0500 X-IronPort-AV: E=Sophos;i="4.84,257,1355068800"; d="scan'208";a="6372884" From: Tang Chen To: jiang.liu@huawei.com, wujianguo@huawei.com, hpa@zytor.com, akpm@linux-foundation.org, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, linfeng@cn.fujitsu.com, yinghai@kernel.org, isimatu.yasuaki@jp.fujitsu.com, rob@landley.net, kosaki.motohiro@jp.fujitsu.com, minchan.kim@gmail.com, mgorman@suse.de, rientjes@google.com, rusty@rustcorp.com.au, lliubbo@gmail.com, jaegeuk.hanse@gmail.com, tony.luck@intel.com, glommer@parallels.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org Subject: [PATCH v3 3/5][RESEND] page_alloc: Introduce zone_movable_limit[] to keep movable limit for nodes Date: Tue, 11 Dec 2012 12:55:49 +0800 Message-Id: <1355201749-27182-1-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1355193207-21797-4-git-send-email-tangchen@cn.fujitsu.com> References: <1355193207-21797-4-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/11 12:55:55, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/11 12:55:56, Serialize complete at 2012/12/11 12:55:56 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch introduces a new array zone_movable_limit[] to store the ZONE_MOVABLE limit from movablecore_map boot option for all nodes. The function sanitize_zone_movable_limit() will find out to which node the ranges in movable_map.map[] belongs, and calculates the low boundary of ZONE_MOVABLE for each node. change log: Do find_usable_zone_for_movable() to initialize movable_zone so that sanitize_zone_movable_limit() could use it. Reported-by: Wu Jianguo Signed-off-by: Tang Chen Signed-off-by: Liu Jiang Reviewed-by: Wen Congyang Reviewed-by: Lai Jiangshan Tested-by: Lin Feng --- mm/page_alloc.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 78 insertions(+), 1 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 1c91d16..52c368e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -206,6 +206,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; static unsigned long __initdata required_kernelcore; static unsigned long __initdata required_movablecore; static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; +static unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES]; /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ int movable_zone; @@ -4340,6 +4341,77 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid, return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); } +/** + * sanitize_zone_movable_limit - Sanitize the zone_movable_limit array. + * + * zone_movable_limit is initialized as 0. This function will try to get + * the first ZONE_MOVABLE pfn of each node from movablecore_map, and + * assigne them to zone_movable_limit. + * zone_movable_limit[nid] == 0 means no limit for the node. + * + * Note: Each range is represented as [start_pfn, end_pfn) + */ +static void __meminit sanitize_zone_movable_limit(void) +{ + int map_pos = 0, i, nid; + unsigned long start_pfn, end_pfn; + + if (!movablecore_map.nr_map) + return; + + /* Iterate all ranges from minimum to maximum */ + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { + /* + * If we have found lowest pfn of ZONE_MOVABLE of the node + * specified by user, just go on to check next range. + */ + if (zone_movable_limit[nid]) + continue; + +#ifdef CONFIG_ZONE_DMA + /* Skip DMA memory. */ + if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA]) + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA]; +#endif + +#ifdef CONFIG_ZONE_DMA32 + /* Skip DMA32 memory. */ + if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA32]) + start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA32]; +#endif + +#ifdef CONFIG_HIGHMEM + /* Skip lowmem if ZONE_MOVABLE is highmem. */ + if (zone_movable_is_highmem() && + start_pfn < arch_zone_lowest_possible_pfn[ZONE_HIGHMEM]) + start_pfn = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM]; +#endif + + if (start_pfn >= end_pfn) + continue; + + while (map_pos < movablecore_map.nr_map) { + if (end_pfn <= movablecore_map.map[map_pos].start_pfn) + break; + + if (start_pfn >= movablecore_map.map[map_pos].end_pfn) { + map_pos++; + continue; + } + + /* + * The start_pfn of ZONE_MOVABLE is either the minimum + * pfn specified by movablecore_map, or 0, which means + * the node has no ZONE_MOVABLE. + */ + zone_movable_limit[nid] = max(start_pfn, + movablecore_map.map[map_pos].start_pfn); + + break; + } + } +} + #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, @@ -4358,6 +4430,10 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid, return zholes_size[zone_type]; } +static void __meminit sanitize_zone_movable_limit(void) +{ +} + #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, @@ -4768,7 +4844,6 @@ static void __init find_zone_movable_pfns_for_nodes(void) goto out; /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ - find_usable_zone_for_movable(); usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; restart: @@ -4923,6 +4998,8 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) /* Find the PFNs that ZONE_MOVABLE begins at in each node */ memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); + find_usable_zone_for_movable(); + sanitize_zone_movable_limit(); find_zone_movable_pfns_for_nodes(); /* Print out the zone ranges */ -- 1.7.1