From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id C84EF6B004A for ; Tue, 30 Nov 2010 20:38:32 -0500 (EST) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id oB11cUPW014264 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Wed, 1 Dec 2010 10:38:30 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 3D0BF45DE50 for ; Wed, 1 Dec 2010 10:38:30 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 19B5345DE4E for ; Wed, 1 Dec 2010 10:38:30 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id EE1C1E78003 for ; Wed, 1 Dec 2010 10:38:29 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.249.87.106]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 9C7341DB8012 for ; Wed, 1 Dec 2010 10:38:29 +0900 (JST) Date: Wed, 1 Dec 2010 10:32:54 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [PATCH 3/3] Provide control over unmapped pages Message-Id: <20101201103254.b823eae0.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20101130101602.17475.32611.stgit@localhost6.localdomain6> References: <20101130101126.17475.18729.stgit@localhost6.localdomain6> <20101130101602.17475.32611.stgit@localhost6.localdomain6> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Balbir Singh Cc: linux-mm@kvack.org, Christoph Lameter , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, kvm List-ID: On Tue, 30 Nov 2010 15:46:31 +0530 Balbir Singh wrote: > Provide control using zone_reclaim() and a boot parameter. The > code reuses functionality from zone_reclaim() to isolate unmapped > pages and reclaim them as a priority, ahead of other mapped pages. > > Signed-off-by: Balbir Singh > --- > include/linux/swap.h | 5 ++- > mm/page_alloc.c | 7 +++-- > mm/vmscan.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++- > 3 files changed, 79 insertions(+), 5 deletions(-) > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index eba53e7..78b0830 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -252,11 +252,12 @@ extern int vm_swappiness; > extern int remove_mapping(struct address_space *mapping, struct page *page); > extern long vm_total_pages; > > -#ifdef CONFIG_NUMA > -extern int zone_reclaim_mode; > extern int sysctl_min_unmapped_ratio; > extern int sysctl_min_slab_ratio; > extern int zone_reclaim(struct zone *, gfp_t, unsigned int); > +extern bool should_balance_unmapped_pages(struct zone *zone); > +#ifdef CONFIG_NUMA > +extern int zone_reclaim_mode; > #else > #define zone_reclaim_mode 0 > static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order) > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 62b7280..4228da3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1662,6 +1662,9 @@ zonelist_scan: > unsigned long mark; > int ret; > > + if (should_balance_unmapped_pages(zone)) > + wakeup_kswapd(zone, order); > + Hm, I'm not sure the final vision of this feature. Does this reclaiming feature can't be called directly via balloon driver just before alloc_page() ? Do you need to keep page caches small even when there are free memory on host ? Thanks, -Kame -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org