Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759951AbZJMOEi (ORCPT ); Tue, 13 Oct 2009 10:04:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759919AbZJMOEh (ORCPT ); Tue, 13 Oct 2009 10:04:37 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.124]:40509 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759910AbZJMOEg (ORCPT ); Tue, 13 Oct 2009 10:04:36 -0400 Subject: Re: [tip:timers/tracing] hrtimer: Add tracepoint for hrtimers From: Steven Rostedt Reply-To: rostedt@goodmis.org To: Ingo Molnar Cc: mingo@redhat.com, hpa@zytor.com, mathieu.desnoyers@polymtl.ca, anton@samba.org, linux-kernel@vger.kernel.org, peterz@infradead.org, zhaolei@cn.fujitsu.com, xiaoguangrong@cn.fujitsu.com, fweisbec@gmail.com, tglx@linutronix.de, kosaki.motohiro@jp.fujitsu.com, linux-tip-commits@vger.kernel.org In-Reply-To: <20091013132656.GA12292@elte.hu> References: <4A7F8B2B.5020908@cn.fujitsu.com> <1255404309.7113.948.camel@gandalf.stny.rr.com> <20091013070853.GA13175@elte.hu> <1255439822.7113.1541.camel@gandalf.stny.rr.com> <20091013132656.GA12292@elte.hu> Content-Type: text/plain Organization: Kihon Technologies Inc. Date: Tue, 13 Oct 2009 10:02:37 -0400 Message-Id: <1255442557.7113.1623.camel@gandalf.stny.rr.com> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1470 Lines: 39 On Tue, 2009-10-13 at 15:26 +0200, Ingo Molnar wrote: > * Steven Rostedt wrote: > > > On Tue, 2009-10-13 at 09:08 +0200, Ingo Molnar wrote: > > > * Steven Rostedt wrote: > > > > > > > > > (unsigned long long)(((ktime_t) { .tv64 = REC->expires }).tv64) > > > > > > > > Is not easy. It's basically implementing a C interpreter :-( > > > > > > Btw., what i suggested quite some time ago was that we should bind > > > tracepoints by emitting C source code stubs, which tools can then build > > > and link in, using gcc. > > > > Yeah, and I thought about that too. But that kills any chance of > > running the trace on one box (non x86) and reading it on another > > (x86). And that is one of my goals for this. > > Why does it kill that chance? Ah, I was thinking binary libraries from the trace points. But I missed you said C source code. But still, we need to build a way to convert big endian to little, as well as perhaps converting 32bit to 64 bit longs. As well as vice versa. We also need a way to export all structures (here ktime_t) as well as enums. Of course we need to export enums now anyway, since the tools don't know how to convert them now. -- Steve -- 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/