Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 21 Sep 2002 00:35:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 21 Sep 2002 00:35:38 -0400 Received: from mx2.elte.hu ([157.181.151.9]:60893 "HELO mx2.elte.hu") by vger.kernel.org with SMTP id ; Sat, 21 Sep 2002 00:35:37 -0400 Date: Sat, 21 Sep 2002 06:48:40 +0200 (CEST) From: Ingo Molnar Reply-To: Ingo Molnar To: Bill Huey Cc: Ulrich Drepper , linux-kernel Subject: Re: [ANNOUNCE] Native POSIX Thread Library 0.1 In-Reply-To: <20020920215029.GB1527@gnuppy.monkey.org> 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 Content-Length: 1020 Lines: 26 On Fri, 20 Sep 2002, Bill Huey wrote: > The JVM with incremental GC is being targetted for media oriented tasks > using the new NIO, 3d library, etc... slowness in safepoints would > cripple it for these tasks. It's a critical item and not easily address > by the current 1:1 model. actually, in the previous mail i've outlined a sensible way to help safepoints in the kernel, for the case of the 1:1 model. I'd not call that 'not easily addressed' :-) there's an even more advanced way to expose preempted user contexts in the 1:1 model: by putting most of the the register info (which is now dumped into the kernel stack) into a page that is also mapped into user-space. This too introduces (constant) syscall entry/exit overhead, but can be done if justified. Ingo - 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/