Message-ID: <4A64C610.7090406@linux.intel.com>
Date: Mon, 20 Jul 2009 12:31:28 -0700
From: Arjan van de Ven <arjan@linux.intel.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>,
       "Kok, Auke-jan H" <auke-jan.h.kok@intel.com>,
       Steven Rostedt <rostedt@goodmis.org>,
       =?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?= <fweisbec@gmail.com>
Subject: Re: [PATCH] sched: Provide iowait counters
References: <4A64B813.1080506@linux.intel.com> <1248117369.23509.33.camel@laptop>
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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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