Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766988AbXEBRxn (ORCPT ); Wed, 2 May 2007 13:53:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1766985AbXEBRxn (ORCPT ); Wed, 2 May 2007 13:53:43 -0400 Received: from nz-out-0506.google.com ([64.233.162.226]:27682 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1766988AbXEBRxl (ORCPT ); Wed, 2 May 2007 13:53:41 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=IDnsEX1AtWTtul/rob/tjktSmmAMZ5ukoqZWWAM8nkOY7Dks+6xmSBj2VfxY8jzgALOuMPMYQtIrmwHueEDlAI4iG71ocAU/0S2r8xXQJ1FUvBlhDa5TbO0MIZiYwQQdPh/vxLRC87PDXB5yqE4hc3AC1wnGI98sAOg9cmXCsMo= Message-ID: Date: Wed, 2 May 2007 10:53:40 -0700 From: "Ulrich Drepper" To: "Davide Libenzi" Subject: Re: [patch 14/22] pollfs: pollable futex Cc: "Davi Arnaut" , "Eric Dumazet" , "Andrew Morton" , "Linus Torvalds" , "Linux Kernel Mailing List" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20070502052235.914764000@haxent.com.br> <20070502053427.123392000@haxent.com.br> <20070502095503.a06f5472.dada1@cosmosbay.com> <20070502104936.674a4b54.dada1@cosmosbay.com> <4638C37D.7050503@haxent.com.br> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 963 Lines: 20 On 5/2/07, Davide Libenzi wrote: > Is it? Please do tell me more... Come on, we went through all this. Having to do syscalls for event retrieval plus the limited channel available for feedback (the POLL* bits) is to limiting. This is where the kevent stuff innovated and really fixed the problems. Userlevel ring buffers are more efficient. Yes, a unifying event look is what is wanted. But it does not have to be poll based. Given the right abstraction you can fit in the kevent technology or similar things. And seeing all these requirements of this approach: kevent is also much more resource efficient. No "one file desriptor per thread per object". These are important factors. - 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/