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Message-ID: <4CE30A2C.9010308@linux.intel.com>
Date: Tue, 16 Nov 2010 14:48:12 -0800
From: Darren Hart <dvhart@linux.intel.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Arjan van de Ven <arjan@infradead.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Tom Zanussi <tzanussi@gmail.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Li Zefan <lizf@cn.fujitsu.com>, Jason Baron <jbaron@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Christoph Hellwig <hch@lst.de>, Pekka Enberg <penberg@kernel.org>,
        Lai Jiangshan <laijs@cn.fujitsu.com>,
        Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [ANNOUNCE] New utility: 'trace'
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On 11/16/2010 02:09 PM, Darren Hart wrote:
> On 11/16/2010 02:03 PM, Peter Zijlstra wrote:
>> On Tue, 2010-11-16 at 22:59 +0100, Ingo Molnar wrote:
>>>
>>>
>>> Would you be interested in helping out with (and testing) such a more
>>> generic
>>> approach?
>>
>> how about having perf-record open a named pipe and rewriting everything
>> that comes in through that as an event and storing it in the buffer?
>
> When I'm tracing an app or test-case, I want to be able to quickly add
> and change strings. I like the trace_printk sort of access as it avoids
> having to do a bunch of string formatting (sprintf()) calls in the test
> app.

Sorry - fprintf would work for Peter's suggestion. I had the PR_SET_NAME 
with a short string or another call with jsut a plain C string - those 
would require the user doing the string formatting first.

-- 
Darren Hart
Yocto Linux Kernel