From mboxrd@z Thu Jan 1 00:00:00 1970 From: Balbir Singh Subject: Re: [REPOST] [PATCH 1/3] Move zone_reclaim() outside of CONFIG_NUMA (v3) Date: Fri, 21 Jan 2011 12:49:11 +0530 Message-ID: <20110121071911.GJ2897@balbir.in.ibm.com> References: <20110120123039.30481.81151.stgit@localhost6.localdomain6> <20110120123608.30481.63446.stgit@localhost6.localdomain6> Reply-To: balbir@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 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 To: Christoph Lameter Return-path: Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-Id: kvm.vger.kernel.org * Christoph Lameter [2011-01-20 08:49:27]: > On Thu, 20 Jan 2011, Balbir Singh wrote: > > > --- a/include/linux/swap.h > > +++ b/include/linux/swap.h > > @@ -253,11 +253,11 @@ extern int vm_swappiness; > > extern int remove_mapping(struct address_space *mapping, struct page *page); > > extern long vm_total_pages; > > > > +extern int sysctl_min_unmapped_ratio; > > +extern int zone_reclaim(struct zone *, gfp_t, unsigned int); > > #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); > > #else > > #define zone_reclaim_mode 0 > > So the end result of this patch is that zone reclaim is compiled > into vmscan.o even on !NUMA configurations but since zone_reclaim_mode == > 0 noone can ever call that code? > The third patch, fixes this with the introduction of a config (cut-copy-paste below). If someone were to bisect to this point, what you say is correct. +#if defined(CONFIG_UNMAPPED_PAGECACHE_CONTROL) || defined(CONFIG_NUMA) extern int sysctl_min_unmapped_ratio; extern int zone_reclaim(struct zone *, gfp_t, unsigned int); -#ifdef CONFIG_NUMA -extern int zone_reclaim_mode; -extern int sysctl_min_slab_ratio; #else -#define zone_reclaim_mode 0 static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order) { return 0; } #endif Thanks for the review! -- Three Cheers, Balbir -- 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