From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 9 Apr 2007 10:16:06 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed) In-Reply-To: <20070409164029.GT2986@holomorphy.com> Message-ID: References: <20070401071029.23757.78021.sendpatchset@schroedinger.engr.sgi.com> <200704011246.52238.ak@suse.de> <1175544797.22373.62.camel@localhost.localdomain> <461169CF.6060806@google.com> <4614E293.3010908@shadowen.org> <20070409164029.GT2986@holomorphy.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: Andy Whitcroft , Martin Bligh , Dave Hansen , Andi Kleen , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, KAMEZAWA Hiroyuki List-ID: On Mon, 9 Apr 2007, William Lee Irwin III wrote: > Whatever's going on with the rest of this, I really like this > instrumentation patch. It may be worthwhile to allow pc_start() to be > overridden so things like performance counter MSR's are usable, but > the framework looks very useful. Yeah. I also did some measurements on quicklists on x86_64 and it seems that caching page table pages is also useful: no quicklist pte_alloc 1569048 4.3s(401ns/2.7us/179.7us) pmd_alloc 780988 2.1s(337ns/2.7us/86.1us) pud_alloc 780072 2.2s(424ns/2.8us/300.6us) pgd_alloc 260022 1s(920ns/4us/263.1us) quicklist: pte_alloc 452436 573.4ms(8ns/1.3us/121.1us) pmd_alloc 196204 174.5ms(7ns/889ns/46.1us) pud_alloc 195688 172.4ms(7ns/881ns/151.3us) pgd_alloc 65228 9.8ms(8ns/150ns/6.1us) -- 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