From owner-cvs-src@FreeBSD.ORG Sat Mar 27 12:05:59 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2ED0416A4CE for ; Sat, 27 Mar 2004 12:05:59 -0800 (PST) Received: from relay.pair.com (relay.pair.com [209.68.1.20]) by mx1.FreeBSD.org (Postfix) with SMTP id 9D39943D48 for ; Sat, 27 Mar 2004 12:05:58 -0800 (PST) (envelope-from silby@silby.com) Received: (qmail 75276 invoked from network); 27 Mar 2004 20:05:57 -0000 Received: from niwun.pair.com (HELO localhost) (209.68.2.70) by relay.pair.com with SMTP; 27 Mar 2004 20:05:57 -0000 X-pair-Authenticated: 209.68.2.70 Date: Sat, 27 Mar 2004 14:05:56 -0600 (CST) From: Mike Silbersack To: Alan Cox In-Reply-To: <200403271950.i2RJoN9P033780@repoman.freebsd.org> Message-ID: <20040327140454.H3199@odysseus.silby.com> References: <200403271950.i2RJoN9P033780@repoman.freebsd.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: cvs-src@FreeBSD.org cc: src-committers@FreeBSD.org cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern subr_param.c sys_pipe.c src/sys/sys pipe.h X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Mar 2004 20:05:59 -0000 On Sat, 27 Mar 2004, Alan Cox wrote: > Log: > Revise the direct or optimized case to use uiomove_fromphys() by the reader > instead of ephemeral mappings using pmap_qenter() by the writer. The > writer is still, however, responsible for wiring the pages, just not > mapping them. Consequently, the allocation of KVA for the direct case is > unnecessary. Remove it and the sysctls limiting it, i.e., > kern.ipc.maxpipekvawired and kern.ipc.amountpipekvawired. The number > of temporarily wired pages is still, however, limited by > kern.ipc.maxpipekva. The best advantage of this change is that the workings of direct mapped pipes make much more sense to those of us who are not VM experts. :) Mike "Silby" Silbersack