From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261380AbVAGRvt (ORCPT ); Fri, 7 Jan 2005 12:51:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261400AbVAGRsj (ORCPT ); Fri, 7 Jan 2005 12:48:39 -0500 Received: from zcars04e.nortelnetworks.com ([47.129.242.56]:43973 "EHLO zcars04e.nortelnetworks.com") by vger.kernel.org with ESMTP id S261379AbVAGRqK (ORCPT ); Fri, 7 Jan 2005 12:46:10 -0500 Message-ID: <41DECAA8.3040909@nortelnetworks.com> Date: Fri, 07 Jan 2005 11:45:12 -0600 X-Sybari-Space: 00000000 00000000 00000000 00000000 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040115 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alan Cox CC: Linus Torvalds , Oleg Nesterov , William Lee Irwin III , Linux Kernel Mailing List Subject: Re: Make pipe data structure be a circular list of pages, rather than References: <41DE9D10.B33ED5E4@tv-sign.ru> <1105113998.24187.361.camel@localhost.localdomain> In-Reply-To: <1105113998.24187.361.camel@localhost.localdomain> 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 Alan Cox wrote: > On Gwe, 2005-01-07 at 16:17, Linus Torvalds wrote: > >>it a "don't do that then", and I'll wait to see if people do. I can't >>think of anything that cares about performance that does that anyway: >>becuase system calls are reasonably expensive regardless, anybody who >>cares at all about performance will have buffered things up in user space. > > > Actually I found a load of apps that do this but they don't care about > performance. Lots of people have signal handlers that just do > > write(pipe_fd, &signr, sizeof(signr)) > > so they can drop signalled events into their event loops I would be one of those people, although I do pass the signal information as well. Chris