From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 582BB8D003A for ; Thu, 20 Jan 2011 10:00:25 -0500 (EST) Date: Thu, 20 Jan 2011 09:00:09 -0600 (CST) From: Christoph Lameter Subject: Re: [REPOST] [PATCH 3/3] Provide control over unmapped pages (v3) In-Reply-To: <20110120123649.30481.93286.stgit@localhost6.localdomain6> Message-ID: References: <20110120123039.30481.81151.stgit@localhost6.localdomain6> <20110120123649.30481.93286.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Balbir Singh Cc: linux-mm@kvack.org, akpm@linux-foundation.org, npiggin@kernel.dk, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kosaki.motohiro@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com List-ID: On Thu, 20 Jan 2011, Balbir Singh wrote: > + unmapped_page_control > + [KNL] Available if CONFIG_UNMAPPED_PAGECACHE_CONTROL > + is enabled. It controls the amount of unmapped memory > + that is present in the system. This boot option plus > + vm.min_unmapped_ratio (sysctl) provide granular control min_unmapped_ratio is there to guarantee that zone reclaim does not reclaim all unmapped pages. What you want here is a max_unmapped_ratio. > { > @@ -2297,6 +2320,12 @@ loop_again: > shrink_active_list(SWAP_CLUSTER_MAX, zone, > &sc, priority, 0); > > + /* > + * We do unmapped page reclaim once here and once > + * below, so that we don't lose out > + */ > + reclaim_unmapped_pages(priority, zone, &sc); > + > if (!zone_watermark_ok_safe(zone, order, Hmmmm. Okay that means background reclaim does it. If so then we also want zone reclaim to be able to work in the background I think. max_unmapped_ratio could also be useful to the zone reclaim logic. -- 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