Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752568Ab0DOKY6 (ORCPT ); Thu, 15 Apr 2010 06:24:58 -0400 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:55646 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751946Ab0DOKY5 (ORCPT ); Thu, 15 Apr 2010 06:24:57 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: KOSAKI Motohiro Subject: [PATCH 3/4] mm: introduce free_pages_bulk Cc: kosaki.motohiro@jp.fujitsu.com, Dave Chinner , Mel Gorman , Chris Mason , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org In-Reply-To: <20100415185310.D1A1.A69D9226@jp.fujitsu.com> References: <20100415085420.GT2493@dastard> <20100415185310.D1A1.A69D9226@jp.fujitsu.com> Message-Id: <20100415192412.D1AA.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 15 Apr 2010 19:24:53 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3010 Lines: 94 Now, vmscan is using __pagevec_free() for batch freeing. but pagevec consume slightly lots stack (sizeof(long)*8), and x86_64 stack is very strictly limited. Then, now we are planning to use page->lru list instead pagevec for reducing stack. and introduce new helper function. This is similar to __pagevec_free(), but receive list instead pagevec. and this don't use pcp cache. it is good characteristics for vmscan. Signed-off-by: KOSAKI Motohiro --- include/linux/gfp.h | 1 + mm/page_alloc.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+), 0 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 4c6d413..dbcac56 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -332,6 +332,7 @@ extern void free_hot_cold_page(struct page *page, int cold); #define __free_page(page) __free_pages((page), 0) #define free_page(addr) free_pages((addr),0) +void free_pages_bulk(struct zone *zone, struct list_head *list); void page_alloc_init(void); void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); void drain_all_pages(void); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ba9aea7..1f68832 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2049,6 +2049,50 @@ void free_pages(unsigned long addr, unsigned int order) EXPORT_SYMBOL(free_pages); +/* + * Frees a number of pages from the list + * Assumes all pages on list are in same zone and order==0. + * + * This is similar to __pagevec_free(), but receive list instead pagevec. + * and this don't use pcp cache. it is good characteristics for vmscan. + */ +void free_pages_bulk(struct zone *zone, struct list_head *list) +{ + unsigned long flags; + struct page *page; + struct page *page2; + int nr_pages = 0; + + list_for_each_entry_safe(page, page2, list, lru) { + int wasMlocked = __TestClearPageMlocked(page); + + if (free_pages_prepare(page, 0)) { + /* Make orphan the corrupted page. */ + list_del(&page->lru); + continue; + } + if (unlikely(wasMlocked)) { + local_irq_save(flags); + free_page_mlock(page); + local_irq_restore(flags); + } + nr_pages++; + } + + spin_lock_irqsave(&zone->lock, flags); + __count_vm_events(PGFREE, nr_pages); + zone->all_unreclaimable = 0; + zone->pages_scanned = 0; + __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages); + + list_for_each_entry_safe(page, page2, list, lru) { + /* have to delete it as __free_one_page list manipulates */ + list_del(&page->lru); + __free_one_page(page, zone, 0, page_private(page)); + } + spin_unlock_irqrestore(&zone->lock, flags); +} + /** * alloc_pages_exact - allocate an exact number physically-contiguous pages. * @size: the number of bytes to allocate -- 1.6.5.2 -- 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/