From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Lameter Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB Date: Wed, 14 May 2008 12:21:27 -0700 (PDT) Message-ID: References: <20080510030831.796641881@sgi.com> <20080510030919.604216074@sgi.com> <4825709A.2020407@firstfloor.org> <20080510221515.3540a6cc@bree.surriel.com> <2f11576a0805120038s334dc56cuaf16b8b7c6f87098@mail.gmail.com> <84144f020805120054t1370236ei5ff52279457e026e@mail.gmail.com> <482B2617.5010605@firstfloor.org> <1210789112.4093.14.camel@calx> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Andi Kleen , Pekka Enberg , KOSAKI Motohiro , Rik van Riel , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Mel Gorman , Matthew Wilcox , "Zhang, Yanmin" To: Matt Mackall Return-path: Received: from relay2.sgi.com ([192.48.171.30]:43936 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752993AbYENTVa (ORCPT ); Wed, 14 May 2008 15:21:30 -0400 In-Reply-To: <1210789112.4093.14.camel@calx> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Wed, 14 May 2008, Matt Mackall wrote: > > Interrupt exit in general would have to inspect the per cpu structures of > > all slab caches on the system? > > Why's that? When we're not under pressure (fast path), we can delay (and > batch) remote frees. When we are under pressure (slow path), we can do > everything immediately. Fastpath is what? I guess slow path means we called into the page allocator?