From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx162.postini.com [74.125.245.162]) by kanga.kvack.org (Postfix) with SMTP id 381296B0034 for ; Tue, 13 Aug 2013 17:35:05 -0400 (EDT) Message-ID: <520AA687.3070303@sgi.com> Date: Tue, 13 Aug 2013 16:35:03 -0500 From: Nathan Zimmer MIME-Version: 1.0 Subject: Re: [RFC v3 0/5] Transparent on-demand struct page initialization embedded in the buddy allocator References: <1375465467-40488-1-git-send-email-nzimmer@sgi.com> <1376344480-156708-1-git-send-email-nzimmer@sgi.com> <520A6DFC.1070201@sgi.com> <520A7514.9020008@sgi.com> In-Reply-To: <520A7514.9020008@sgi.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mike Travis Cc: Linus Torvalds , Peter Anvin , Ingo Molnar , Linux Kernel Mailing List , linux-mm , Robin Holt , Rob Landley , Daniel J Blueman , Andrew Morton , Greg Kroah-Hartman , Yinghai Lu , Mel Gorman On 08/13/2013 01:04 PM, Mike Travis wrote: > > On 8/13/2013 10:51 AM, Linus Torvalds wrote: >> by the time you can log in. And if it then takes another ten minutes >> until you have the full 16TB initialized, and some things might be a >> tad slower early on, does anybody really care? The machine will be up >> and running with plenty of memory, even if it may not be *all* the >> memory yet. > Before the patches adding memory took ~45 mins for 16TB and almost 2 hours > for 32TB. Adding it late sped up early boot but late insertion was still > very slow, where the full 32TB was still not fully inserted after an hour. > Doing it in parallel along with the memory hotplug lock per node, we got > it down to the 10-15 minute range. Yes but to get it to the 10-15 minute range I had to change an number of system locks. The system_sleep, the memory_hotplug, zonelist_mutex and there was some general alteration to various wmark routines. Some of those fixes I don't know if they would stand up to proper scrutiny but were quick and dirty hacks to allow for progress. Nate -- 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/ . Don't email: email@kvack.org