From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id 71FB16B00B2 for ; Sat, 9 May 2009 06:01:56 -0400 (EDT) Date: Sat, 9 May 2009 12:01:37 +0200 From: Ingo Molnar Subject: Re: [patch] tracing/mm: add page frame snapshot trace Message-ID: <20090509100137.GC20941@elte.hu> References: <20090508105320.316173813@intel.com> <20090508111031.020574236@intel.com> <20090508114742.GB17129@elte.hu> <20090508124433.GB15949@localhost> <20090509062758.GB21354@elte.hu> <20090509091325.GA7994@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090509091325.GA7994@localhost> Sender: owner-linux-mm@kvack.org To: Wu Fengguang Cc: =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Steven Rostedt , Peter Zijlstra , Li Zefan , Andrew Morton , LKML , KOSAKI Motohiro , Andi Kleen , Matt Mackall , Alexey Dobriyan , "linux-mm@kvack.org" List-ID: * Wu Fengguang wrote: > 2) support concurrent object iterations > For example, a huge 1TB memory space can be split up into 10 > segments which can be queried concurrently (with different options). this should already be possible. If you lseek the trigger file, that will be understood as an 'offset' by the patch, and then write a (decimal) value into the file, that will be the count. So it should already be possible to fork off nr_cpus helper threads, one bound to each CPU, each triggering trace output of a separate segment of the memory map - and each reading that CPU's trace_pipe_raw file to recover the data - all in parallel. Ingo -- 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