Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755996Ab3IYXWp (ORCPT ); Wed, 25 Sep 2013 19:22:45 -0400 Received: from e28smtp08.in.ibm.com ([122.248.162.8]:41998 "EHLO e28smtp08.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753228Ab3IYXWn (ORCPT ); Wed, 25 Sep 2013 19:22:43 -0400 From: "Srivatsa S. Bhat" Subject: [RFC PATCH v4 20/40] mm: Provide a mechanism to request free memory from the region allocator 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 04:48:29 +0530 Message-ID: <20130925231828.26184.18736.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-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13092523-2000-0000-0000-00000DDDF069 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1843 Lines: 55 Implement helper functions to request freepages from the region allocator in order to add them to the buddy freelists. For simplicity, all operations related to the region allocator are performed at the granularity of entire memory regions. That is, when the buddy allocator requests freepages from the region allocator, the latter picks a free region and always allocates all the freepages belonging to that entire region. Signed-off-by: Srivatsa S. Bhat --- mm/page_alloc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c727bba..d71d671 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -939,6 +939,29 @@ static void add_to_region_allocator(struct zone *z, struct free_list *free_list, del_from_freelist_bulk(ralloc_list, free_list, order, region_id); } +/* Delete freepages from the region allocator and add them to buddy freelists */ +static int del_from_region_allocator(struct zone *zone, unsigned int order, + int migratetype) +{ + struct region_allocator *reg_alloc; + struct list_head *ralloc_list; + struct free_list *free_list; + int next_region; + + reg_alloc = &zone->region_allocator; + + next_region = reg_alloc->next_region; + if (next_region < 0) + return -ENOMEM; + + ralloc_list = ®_alloc->region[next_region].region_area[order].list; + free_list = &zone->free_area[order].free_list[migratetype]; + + add_to_freelist_bulk(ralloc_list, free_list, order, next_region); + + return 0; +} + /* * Freeing function for a buddy system allocator. * -- 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/