Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756797AbZGPNlQ (ORCPT ); Thu, 16 Jul 2009 09:41:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756648AbZGPNlQ (ORCPT ); Thu, 16 Jul 2009 09:41:16 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:38279 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756609AbZGPNlP (ORCPT ); Thu, 16 Jul 2009 09:41:15 -0400 Subject: Re: [PATCH] mm: count only reclaimable lru pages From: Peter Zijlstra To: Wu Fengguang Cc: KOSAKI Motohiro , Minchan Kim , Johannes Weiner , David Howells , "riel@redhat.com" , Andrew Morton , LKML , Christoph Lameter , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "Barnes, Jesse" In-Reply-To: <20090716133454.GA20550@localhost> References: <20090716133454.GA20550@localhost> Content-Type: text/plain Date: Thu, 16 Jul 2009 15:40:51 +0200 Message-Id: <1247751651.6586.17.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1104 Lines: 27 On Thu, 2009-07-16 at 21:34 +0800, Wu Fengguang wrote: > global_lru_pages() / zone_lru_pages() can be used in two ways: > - to estimate max reclaimable pages in determine_dirtyable_memory() > - to calculate the slab scan ratio > > When swap is full or not present, the anon lru lists are not reclaimable > and thus won't be scanned. So the anon pages shall not be counted. Also > rename the function names to reflect the new meaning. > > It can greatly (and correctly) increase the slab scan rate under high memory > pressure (when most file pages have been reclaimed and swap is full/absent), > thus avoid possible false OOM kills. > > Cc: Minchan Kim > Cc: KOSAKI Motohiro > Signed-off-by: Wu Fengguang Makes sense. Acked-by: Peter Zijlstra -- 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/