From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 94F1B6B006A for ; Tue, 17 Feb 2009 07:33:01 -0500 (EST) Received: by wa-out-1112.google.com with SMTP id k22so1429386waf.22 for ; Tue, 17 Feb 2009 04:33:00 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <1234871651.4744.89.camel@laptop> References: <1234863220.4744.34.camel@laptop> <499A99BC.2080700@bk.jp.nec.com> <20090217201651.576E.A69D9226@jp.fujitsu.com> <1234871651.4744.89.camel@laptop> Date: Tue, 17 Feb 2009 21:33:00 +0900 Message-ID: <2f11576a0902170433x52b63a05ie96601c741c3fc7a@mail.gmail.com> Subject: Re: [PATCH] Add tracepoints to track pagecache transition From: KOSAKI Motohiro Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Peter Zijlstra Cc: Atsushi Tsuji , linux-kernel@vger.kernel.org, Jason Baron , Ingo Molnar , Mathieu Desnoyers , "Frank Ch. Eigler" , Kazuto Miyoshi , rostedt@goodmis.org, linux-mm , Andrew Morton , Nick Piggin , Hugh Dickins , Arnaldo Carvalho de Melo List-ID: >> If you want to see I/O activity, you need to add tracepoint into block >> layer. > > We already have that, Arnaldo converted blktrace to use tracepoints and > wrote an ftrace tracer for it. Yup. I agree I selected wrong word. My point is, if he want to know I/O delaying reason, the number of the cache pages seems unrelated thing. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org