From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pekka Enberg" Subject: Re: [PATCH 08/29] mm: kmem_cache_objs_to_pages() Date: Wed, 21 Feb 2007 17:47:59 +0200 Message-ID: <84144f020702210747t50d7d92ei1a2f5da8bf117d40@mail.gmail.com> References: <20070221144304.512721000@taijtu.programming.kicks-ass.net> <20070221144842.299190000@taijtu.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, "Trond Myklebust" , "Thomas Graf" , "David Miller" To: "Peter Zijlstra" Return-path: Received: from ug-out-1314.google.com ([66.249.92.170]:33725 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161299AbXBUPsB (ORCPT ); Wed, 21 Feb 2007 10:48:01 -0500 Received: by ug-out-1314.google.com with SMTP id 44so1070196uga for ; Wed, 21 Feb 2007 07:48:00 -0800 (PST) In-Reply-To: <20070221144842.299190000@taijtu.programming.kicks-ass.net> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hi Peter, On 2/21/07, Peter Zijlstra wrote: > Provide a method to calculate the number of pages needed to store a given > number of slab objects (upper bound when considering possible partial and > free slabs). So how does this work? You ask the slab allocator how many pages you need for a given number of objects and then those pages are available to it via the page allocator? Can other users also dip into those reserves? I would prefer we simply have an API for telling the slab allocator to keep certain number of pages in a reserve for a cache rather than exposing internals such as object size to rest of the world. Pekka