Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762841AbXEPFv0 (ORCPT ); Wed, 16 May 2007 01:51:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761295AbXEPFvT (ORCPT ); Wed, 16 May 2007 01:51:19 -0400 Received: from smtp104.mail.mud.yahoo.com ([209.191.85.214]:41992 "HELO smtp104.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1761166AbXEPFvT (ORCPT ); Wed, 16 May 2007 01:51:19 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=X7y9yoMdC+oHEF05aZLz1sIfzhNIFZjXfvuRnY+ZXAkrJnrAma1EnLor9NvZJTLwOZmnz1m+PPGKleiDrreEFalTiG+T43y3s/A1CIrh/pQaGJgR1/TnOylXigsZY/yqwyqkvaGYGT06dmseqUKON6hLjvRywvifT3IiGciIXp0= ; X-YMail-OSG: bjlv_ugVM1ko4fvmZ2hVvpNDheujzr5cJDyydvr_2qXo2SrBh1.fCpgEe7gNdIk1kWXLao1Bew-- Message-ID: <464A9BD1.1030300@yahoo.com.au> Date: Wed, 16 May 2007 15:51:13 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton CC: Christoph Lameter , linux-kernel@vger.kernel.org, Satyam Sharma , Nate Diller Subject: Re: Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user References: <20070515202442.eeaa49a0.akpm@linux-foundation.org> <464A8DF5.2010903@yahoo.com.au> <20070515222912.ae836e00.akpm@linux-foundation.org> In-Reply-To: <20070515222912.ae836e00.akpm@linux-foundation.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1025 Lines: 26 Andrew Morton wrote: > On Wed, 16 May 2007 14:52:05 +1000 Nick Piggin wrote: >>>On the other hand non highmem platforms are burdened with always repeating >>>the same KM_USER0 in every function call. Isnt it enough to know that >>>standard functions use KM_USER0 for their operations? >> >>Couldn't that be filtered out inline? > > > It is - there is no runtime overhead for non-highmem machines. > > The problem nowadays is all the developers who don't need, have, compile > for or test on highmem machines. Well sure, if that's all Christoph is worried about, then it isn't really valid because in generic code we have to follow the architecture abstraction API -- there is no "non highmem platform" in generic code :) -- SUSE Labs, Novell Inc. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/