From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933825AbbDVXpF (ORCPT ); Wed, 22 Apr 2015 19:45:05 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:50680 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755590AbbDVXpC (ORCPT ); Wed, 22 Apr 2015 19:45:02 -0400 Date: Wed, 22 Apr 2015 16:45:00 -0700 From: Andrew Morton To: Mel Gorman Cc: Linux-MM , Nathan Zimmer , Dave Hansen , Waiman Long , Scott Norton , Daniel J Blueman , LKML Subject: Re: [PATCH 10/13] x86: mm: Enable deferred struct page initialisation on x86-64 Message-Id: <20150422164500.121a355e6b578243cb3650e3@linux-foundation.org> In-Reply-To: <1429722473-28118-11-git-send-email-mgorman@suse.de> References: <1429722473-28118-1-git-send-email-mgorman@suse.de> <1429722473-28118-11-git-send-email-mgorman@suse.de> X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 22 Apr 2015 18:07:50 +0100 Mel Gorman wrote: > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -32,6 +32,7 @@ config X86 > select HAVE_UNSTABLE_SCHED_CLOCK > select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 > select ARCH_SUPPORTS_INT128 if X86_64 > + select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT if X86_64 && NUMA Put this in the "config X86_64" section and skip the "X86_64 &&"? Can we omit the whole defer_meminit= thing and permanently enable the feature? That's simpler, provides better test coverage and is, we hope, faster. And can this be used on non-NUMA? Presumably that won't speed things up any if we're bandwidth limited but again it's simpler and provides better coverage.