From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 25 Sep 2000 16:29:42 +0200 (CEST) From: Ingo Molnar Reply-To: mingo@elte.hu Subject: Re: [patch] vmfixes-2.4.0-test9-B2 In-Reply-To: <20000925161358.J22882@athlon.random> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrea Arcangeli Cc: Linus Torvalds , Rik van Riel , Roger Larsson , MM mailing list , linux-kernel@vger.kernel.org List-ID: On Mon, 25 Sep 2000, Andrea Arcangeli wrote: > driver (and I very much hope that with EXCLUSIVE gone away and the > wait_on_* fixed those hangs will go away because I don't see anything else > wrong at this moment). the EXCLUSIVE thing only optimizes the wakeup, it's not semantic! How better is it to let 100 processes race for one freed-up request slot? There is no guarantee at all that the reader will win. If reads and writes racing for request slots ever becomes a problem then we should introduce a separate read and write waitqueue. the EXCLUSIVE thing was noticed by Dimitris i think, and it makes tons of (performance) sense. Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/