Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 22 Jan 2003 14:28:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 22 Jan 2003 14:28:15 -0500 Received: from air-2.osdl.org ([65.172.181.6]:61111 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id ; Wed, 22 Jan 2003 14:28:14 -0500 Date: Wed, 22 Jan 2003 11:32:06 -0800 (PST) From: "Randy.Dunlap" X-X-Sender: To: Jamie Lokier cc: Ed Tomlinson , Subject: Re: {sys_,/dev/}epoll waiting timeout In-Reply-To: <20030122193446.GA5438@bjl1.asuk.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 22 Jan 2003, Jamie Lokier wrote: | Randy.Dunlap wrote: | > | > Why assume HZ=1000? Would not: | > | > | > | > timeout = (unsigned long)(timeout*HZ+(HZ-1))/HZ+1; | > | > | > | > make more sense? | > | | > | No, that's silly. Why do you want to multiply by HZ and then divide by HZ? | > | > OK, I don't get it. All Ed did was replace 1000 with HZ and | > 999 with (HZ-1). What's bad about that? Seems to me like | > the right thing to do. Much more portable. | > | > What if HZ changes? Who's going to audit the kernel for changes? | | You're being dense. The input timeout is measured in milliseconds; | see poll(2). The calculated timeout is measured in jiffies. Hence | multiply by jiffies and divide by milliseconds. Like I said, I didn't get it. Now I do. Thanks. -- ~Randy - 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/