Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030542AbVLWPA7 (ORCPT ); Fri, 23 Dec 2005 10:00:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030544AbVLWPA7 (ORCPT ); Fri, 23 Dec 2005 10:00:59 -0500 Received: from ms-smtp-02.nyroc.rr.com ([24.24.2.56]:62713 "EHLO ms-smtp-02.nyroc.rr.com") by vger.kernel.org with ESMTP id S1030543AbVLWPA6 (ORCPT ); Fri, 23 Dec 2005 10:00:58 -0500 Date: Fri, 23 Dec 2005 10:00:46 -0500 (EST) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Andrew Morton cc: Nicolas Pitre , hch@infradead.org, alan@lxorguk.ukuu.org.uk, arjan@infradead.org, mingo@elte.hu, linux-kernel@vger.kernel.org, torvalds@osdl.org, arjanv@infradead.org, jes@trained-monkey.org, zwane@arm.linux.org.uk, oleg@tv-sign.ru, dhowells@redhat.com, bcrl@kvack.org, ak@suse.de, rmk+lkml@arm.linux.org.uk Subject: Re: [patch 0/9] mutex subsystem, -V4 In-Reply-To: <20051223065118.95738acc.akpm@osdl.org> Message-ID: References: <20051222114147.GA18878@elte.hu> <20051222035443.19a4b24e.akpm@osdl.org> <20051222122011.GA20789@elte.hu> <20051222050701.41b308f9.akpm@osdl.org> <1135257829.2940.19.camel@laptopd505.fenrus.org> <20051222054413.c1789c43.akpm@osdl.org> <1135260709.10383.42.camel@localhost.localdomain> <20051222153014.22f07e60.akpm@osdl.org> <20051222233416.GA14182@infradead.org> <20051222221311.2f6056ec.akpm@osdl.org> <20051223065118.95738acc.akpm@osdl.org> 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: 1010 Lines: 27 On Fri, 23 Dec 2005, Andrew Morton wrote: > Nicolas Pitre wrote: > > > > How can't you get the fact that semaphores could _never_ be as simple as > > mutexes? This is a theoritical impossibility, which maybe turns out not > > to be so true on x86, but which is damn true on ARM where the fast path > > (the common case of a mutex) is significantly more efficient. > > > > I did notice your comments. I'll grant that mutexes will save some tens of > fastpath cycles on one minor architecture. Sorry, but that doesn't seem > very important. > "minor architecture"? Granted, I don't know of any ARM desktops or servers, but there's a large number of ARM devices out in the real world. Or are we giving up on Linux being an embedded OS? -- Steve - 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/