From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [PATCH] PERF(kernel): Cleanup power events V2
Date: Tue, 26 Oct 2010 02:58:24 -0700
Message-ID: <4CC6A640.8040700@linux.intel.com>
References: <1287488171-25303-3-git-send-email-trenn@suse.de> <1288049630-10947-1-git-send-email-trenn@suse.de> <20101026071020.GC13036@elte.hu>
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To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Renninger <trenn@suse.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Frank Eigler <fche@redhat.com>, Steven Rostedt <rostedt@goodmis.org>, Kevin Hilman <khilman@deeprootsystems.com>, Peter Zijlstra <peterz@infradead.org>, linux-omap@vger.kernel.org, rjw@sisk.pl, linux-pm@lists.linux-foundation.org, linux-trace-users@vger.kernel.org, Jean Pihet <jean.pihet@newoldbits.com>, Pierre Tardy <tardyp@gmail.com>, Frederic Weisbecker <fweisbec@gmail.com>, Tejun Heo <tj@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
List-Id: linux-omap@vger.kernel.org

On 10/26/2010 12:10 AM, Ingo Molnar wrote:
> +
>> +	TP_STRUCT__entry(
>> +		__field(	u32,		state		)
>> +		__field(	u32,		cpu_id		)
> Trace entries can carry a cpu_id of the current processor already. Can this cpu_id
> ever be different from that CPU id?

yes

esp cpu frequency you can change cross cpu....

originally we did not have this in the API but Thomas added it for that 
reason some time ago.