Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755373Ab3IYXTD (ORCPT ); Wed, 25 Sep 2013 19:19:03 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:38120 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752591Ab3IYXTA (ORCPT ); Wed, 25 Sep 2013 19:19:00 -0400 From: "Srivatsa S. Bhat" Subject: [RFC PATCH v4 05/40] mm: Add data-structures to describe memory regions within the zones' freelists To: akpm@linux-foundation.org, mgorman@suse.de, dave@sr71.net, hannes@cmpxchg.org, tony.luck@intel.com, matthew.garrett@nebula.com, riel@redhat.com, arjan@linux.intel.com, srinivas.pandruvada@linux.intel.com, willy@linux.intel.com, kamezawa.hiroyu@jp.fujitsu.com, lenb@kernel.org, rjw@sisk.pl Cc: gargankita@gmail.com, paulmck@linux.vnet.ibm.com, svaidy@linux.vnet.ibm.com, andi@firstfloor.org, isimatu.yasuaki@jp.fujitsu.com, santosh.shilimkar@ti.com, kosaki.motohiro@gmail.com, srivatsa.bhat@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Thu, 26 Sep 2013 04:44:40 +0530 Message-ID: <20130925231437.26184.47160.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20130925231250.26184.31438.stgit@srivatsabhat.in.ibm.com> References: <20130925231250.26184.31438.stgit@srivatsabhat.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13092523-5140-0000-0000-000003E417BC Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5923 Lines: 171 In order to influence page allocation decisions (i.e., to make page-allocation region-aware), we need to be able to distinguish pageblocks belonging to different zone memory regions within the zones' (buddy) freelists. So, within every freelist in a zone, provide pointers to describe the boundaries of zone memory regions and counters to track the number of free pageblocks within each region. Also, fixup the references to the freelist's list_head inside struct free_area. Signed-off-by: Srivatsa S. Bhat --- include/linux/mmzone.h | 17 ++++++++++++++++- mm/compaction.c | 2 +- mm/page_alloc.c | 23 ++++++++++++----------- mm/vmstat.c | 2 +- 4 files changed, 30 insertions(+), 14 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index a22358c..2ac8025 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -83,8 +83,23 @@ static inline int get_pageblock_migratetype(struct page *page) return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end); } +struct mem_region_list { + struct list_head *page_block; + unsigned long nr_free; +}; + +struct free_list { + struct list_head list; + + /* + * Demarcates pageblocks belonging to different regions within + * this freelist. + */ + struct mem_region_list mr_list[MAX_NR_ZONE_REGIONS]; +}; + struct free_area { - struct list_head free_list[MIGRATE_TYPES]; + struct free_list free_list[MIGRATE_TYPES]; unsigned long nr_free; }; diff --git a/mm/compaction.c b/mm/compaction.c index c437893..511b191 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -858,7 +858,7 @@ static int compact_finished(struct zone *zone, struct free_area *area = &zone->free_area[order]; /* Job done if page is free of the right migratetype */ - if (!list_empty(&area->free_list[cc->migratetype])) + if (!list_empty(&area->free_list[cc->migratetype].list)) return COMPACT_PARTIAL; /* Job done if allocation would set block type */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d747f92..e9d8082 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -606,12 +606,13 @@ static inline void __free_one_page(struct page *page, higher_buddy = higher_page + (buddy_idx - combined_idx); if (page_is_buddy(higher_page, higher_buddy, order + 1)) { list_add_tail(&page->lru, - &zone->free_area[order].free_list[migratetype]); + &zone->free_area[order].free_list[migratetype].list); goto out; } } - list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); + list_add(&page->lru, + &zone->free_area[order].free_list[migratetype].list); out: zone->free_area[order].nr_free++; } @@ -832,7 +833,7 @@ static inline void expand(struct zone *zone, struct page *page, continue; } #endif - list_add(&page[size].lru, &area->free_list[migratetype]); + list_add(&page[size].lru, &area->free_list[migratetype].list); area->nr_free++; set_page_order(&page[size], high); } @@ -894,10 +895,10 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, /* Find a page of the appropriate size in the preferred list */ for (current_order = order; current_order < MAX_ORDER; ++current_order) { area = &(zone->free_area[current_order]); - if (list_empty(&area->free_list[migratetype])) + if (list_empty(&area->free_list[migratetype].list)) continue; - page = list_entry(area->free_list[migratetype].next, + page = list_entry(area->free_list[migratetype].list.next, struct page, lru); list_del(&page->lru); rmv_page_order(page); @@ -969,7 +970,7 @@ int move_freepages(struct zone *zone, order = page_order(page); list_move(&page->lru, - &zone->free_area[order].free_list[migratetype]); + &zone->free_area[order].free_list[migratetype].list); set_freepage_migratetype(page, migratetype); page += 1 << order; pages_moved += 1 << order; @@ -1076,10 +1077,10 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) break; area = &(zone->free_area[current_order]); - if (list_empty(&area->free_list[migratetype])) + if (list_empty(&area->free_list[migratetype].list)) continue; - page = list_entry(area->free_list[migratetype].next, + page = list_entry(area->free_list[migratetype].list.next, struct page, lru); area->nr_free--; @@ -1323,7 +1324,7 @@ void mark_free_pages(struct zone *zone) } for_each_migratetype_order(order, t) { - list_for_each(curr, &zone->free_area[order].free_list[t]) { + list_for_each(curr, &zone->free_area[order].free_list[t].list) { unsigned long i; pfn = page_to_pfn(list_entry(curr, struct page, lru)); @@ -3193,7 +3194,7 @@ void show_free_areas(unsigned int filter) types[order] = 0; for (type = 0; type < MIGRATE_TYPES; type++) { - if (!list_empty(&area->free_list[type])) + if (!list_empty(&area->free_list[type].list)) types[order] |= 1 << type; } } @@ -4049,7 +4050,7 @@ static void __meminit zone_init_free_lists(struct zone *zone) { int order, t; for_each_migratetype_order(order, t) { - INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); + INIT_LIST_HEAD(&zone->free_area[order].free_list[t].list); zone->free_area[order].nr_free = 0; } } diff --git a/mm/vmstat.c b/mm/vmstat.c index 9bb3145..c967043 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -901,7 +901,7 @@ static void pagetypeinfo_showfree_print(struct seq_file *m, area = &(zone->free_area[order]); - list_for_each(curr, &area->free_list[mtype]) + list_for_each(curr, &area->free_list[mtype].list) freecount++; seq_printf(m, "%6lu ", freecount); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/