From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f178.google.com (mail-pd0-f178.google.com [209.85.192.178]) by kanga.kvack.org (Postfix) with ESMTP id D27C96B005A for ; Wed, 25 Sep 2013 19:22:45 -0400 (EDT) Received: by mail-pd0-f178.google.com with SMTP id w10so317854pde.23 for ; Wed, 25 Sep 2013 16:22:45 -0700 (PDT) Received: from /spool/local by e28smtp05.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 26 Sep 2013 04:52:40 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id 04C69E0053 for ; Thu, 26 Sep 2013 04:53:42 +0530 (IST) Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r8PNOrZe37617792 for ; Thu, 26 Sep 2013 04:54:54 +0530 Received: from d28av05.in.ibm.com (localhost [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id r8PNMZtP016130 for ; Thu, 26 Sep 2013 04:52:36 +0530 From: "Srivatsa S. Bhat" Subject: [RFC PATCH v4 20/40] mm: Provide a mechanism to request free memory from the region allocator 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> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org