Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758319Ab0KAQAe (ORCPT ); Mon, 1 Nov 2010 12:00:34 -0400 Received: from tomts20-srv.bellnexxia.net ([209.226.175.74]:55087 "EHLO tomts20-srv.bellnexxia.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756875Ab0KAQAc (ORCPT ); Mon, 1 Nov 2010 12:00:32 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvsEAN59zkxGGOIS/2dsb2JhbAChWHK+I4VFBI9d Date: Mon, 1 Nov 2010 12:00:30 -0400 From: Mathieu Desnoyers To: Jens Axboe Cc: Pekka Enberg , Jesper Juhl , linux-kernel@vger.kernel.org, Andrew Morton , Tom Zanussi , Karim Yaghmour , Paul Mundt , Steven Rostedt Subject: Re: [PATCH] Optimize relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset Message-ID: <20101101160030.GA7638@Krystal> References: <20101030214704.GA20005@Krystal> <4CCEB723.2010005@kernel.dk> <20101101130842.GA24605@Krystal> <4CCEC3B9.1060703@kernel.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: <4CCEC3B9.1060703@kernel.dk> X-Editor: vi X-Info: http://krystal.dyndns.org:8080 X-Operating-System: Linux/2.6.27.31-grsec (i686) X-Uptime: 12:00:13 up 208 days, 1:50, 3 users, load average: 0.14, 0.09, 0.05 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1679 Lines: 42 * Jens Axboe (axboe@kernel.dk) wrote: > On 2010-11-01 09:41, Pekka Enberg wrote: > > * Jens Axboe (axboe@kernel.dk) wrote: > >>> On 2010-10-30 17:47, Mathieu Desnoyers wrote: > >>>> BLK_DEV_IO_TRACE seems to still select RELAY. Has it completed its > >>>> transition to either Ftrace or Perf ? Depending on Jens, moving blktrace > >>>> relay dependency to the Generic Ring Buffer Library might be a good > >>>> option to consider. > >>> > >>> The blktrace user bits is still (by far) the most wide spread way that > >>> blktrace is used in the field, and those still rely on relayfs. So no, > >>> we can't kill it now. > > > > On Mon, Nov 1, 2010 at 3:08 PM, Mathieu Desnoyers > > wrote: > >> What I am proposing is that the Generic Ring Buffer Library could > >> replace relayfs without changing any of the interfaces blktrace exposes > >> to user-space. Indeed, I would not remove relayfs unless there was a > >> replacement. > > > > We don't in general NAK cleanups because of future features or > > removals that may or may not happen. > > Agree, this is parallel to whether or not we can transition blktrace to > using the generic ring buffer library or not. If the current patch > proposed makes sense, then it should go in regardless of > potential/future plans. Agreed. Thanks, Mathieu -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com -- 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/