Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757894Ab0KANen (ORCPT ); Mon, 1 Nov 2010 09:34:43 -0400 Received: from 0122700014.0.fullrate.dk ([95.166.99.235]:36314 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757612Ab0KANej (ORCPT ); Mon, 1 Nov 2010 09:34:39 -0400 Message-ID: <4CCEC1E6.9010806@kernel.dk> Date: Mon, 01 Nov 2010 09:34:30 -0400 From: Jens Axboe MIME-Version: 1.0 To: Mathieu Desnoyers CC: 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 References: <20101030214704.GA20005@Krystal> <4CCEB723.2010005@kernel.dk> <20101101130842.GA24605@Krystal> In-Reply-To: <20101101130842.GA24605@Krystal> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1292 Lines: 30 On 2010-11-01 09:08, Mathieu Desnoyers 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. > > 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. Sure, I'm open to such a solution as long as it doesn't slow anything down for blktrace (primary concern, certainly) and retains feature parity. I'm not married to relayfs, it's just what was available easily when I added blktrace originally. -- Jens Axboe -- 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/