linux-kernel - Re: [PATCH] sched: Provide iowait counters

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Date:	Mon, 20 Jul 2009 12:31:28 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] sched: Provide iowait counters

Peter Zijlstra wrote:
> 
> It might be nice to put a tracepoint there as well, now if there was a
> way to specify perf counter attributes in the TRACE_EVENT() magic so
> that we can feed stuff into perf_tpcounter_event().
> 
> TP_perf_addr()  -- defaults to 0 when not specified
> TP_perf_count() -- defaults to 1 when not specified.
> 
> Steve, Frederic, is there any way to make that happen?
> 
> Failing that we could put an actual swcounter in there I suppose.
> 
> That way we could profile applications based on IO-wait, which would be
> cool.

it'd be nice if this was also a perfcounter event, no doubt about that
(I already have some usages in mind).... but that'd be a separate patch.
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