From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760578AbYDQH0S (ORCPT ); Thu, 17 Apr 2008 03:26:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753539AbYDQH0H (ORCPT ); Thu, 17 Apr 2008 03:26:07 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:55541 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752034AbYDQH0G (ORCPT ); Thu, 17 Apr 2008 03:26:06 -0400 Date: Thu, 17 Apr 2008 00:25:52 -0700 From: Andrew Morton To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Linus Torvalds Subject: Re: [v2.6.26] what's brewing in x86.git for v2.6.26 Message-Id: <20080417002552.5742ad65.akpm@linux-foundation.org> In-Reply-To: <20080416202338.GA6007@elte.hu> References: <20080416202338.GA6007@elte.hu> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 16 Apr 2008 22:23:38 +0200 Ingo Molnar wrote: > > what's brewing in x86.git for v2.6.26? How much of this has not been in -mm? How much of this has not been in linux-next? > too many topics to list them all - there are 884 patches from 74 authors > at the moment. > > a few highlights: > > - 4096 CPUs support. (Yes, such big boxes exist, and they run Linux.) > > - mmiotrace feature: trace accesses to hw components to help figure out > how they are programmed. > > - kmemcheck feature: Valgrind for the native Linux kernel in essence - > detects access to uninitialized memory. > > - ftrace plugin for sysprof sysprof is crap. > - fixed StackProtector security feature (these fixes were too intrusive > for v2.6.25) > > - lazy FPU allocation/speedup - offloaded/large FPU/SSE state support > > - SMP-boot, mpparse, DMA ops unification > > - PAT support - first step towards phasing out MTRR's for cache > attribute control > > - enable GBPAGES - faster TLB misses on CPUs that support it > > - debug helper: view kernel pagetable layout via debugfs Needs documentation. > x86: introduce /dev/mem restrictions with a config option This should be runtime-settable, not build-time settable. > ... > > Randy Dunlap (2): > ... > linux-next: Tree for April 10 (arch/x86) borked patch title. > Soren Sandmann (1): > x86: add the debugfs interface for the sysprof tool There were serious objections that this is weaker than and duplicative of oprofile which were not adequately addressed. Also, I (and apparently only I) actually reviewed the implementation and found it to be riddled with bugs and shortcomings. afacit this was completely ignored and you propose to merge it anwyay? I obviously don't have time to go through it all, but I'm afraid I cannot be very confident in it. All I can say is "the parts which have been in -mm seem to compile and run". A quick grep indicates that only 644 of these 884 patches are in -mm. And a lot of them only turned up a week or two ago.