linux-kernel - Re: [RFC] [PATCH 0/5] Teach perf tool to profile sleep times (V4)

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Date:	Mon, 04 Jun 2012 14:50:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Vagin <avagin@...nvz.org>
Cc:	Arun Sharma <asharma@...com>, Oleg Strikov <OSTRIKOV@...dia.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH 0/5] Teach perf tool to profile sleep times (V4)

On Mon, 2012-06-04 at 14:40 +0200, Peter Zijlstra wrote:
> +       if (task) {
> +               struct perf_event_context *ctx;
> +
> +               rcu_read_lock();
> +               ctx = rcu_dereference(task->perf_event_ctxp[perf_sw_context]);
> +               list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {

Ah, this needs a little something like the below:

			if (!(event->attr.type == PERF_TYPE_TRACEPOINT &&
			      event->attr.config == $something))
				continue;

Not exactly sure where we hid the tracepoint_id at this point..


> +                       if (perf_tp_event_match(event, &data, regs))
> +                               perf_swevent_event(event, count, &data, regs);
> +               }
> +               rcu_read_unlock();
> +       } 
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