linux-kernel - Re: TRACE_EVENT() declarations belong to include/trace/

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Message-ID: <20100412232456.GI11751@kryten>
Date:	Tue, 13 Apr 2010 09:24:56 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: TRACE_EVENT() declarations belong to include/trace/


Hi Frederic,

> If this is to trace all irqs, then it seems to me the wrong way.
> We already have generic irq_handler_entry and irq_handler_exit trace events.
> 
> May be those in powerpc are here to get the spurious irqs by computing
> a diff between generic and arch irq events? In which case
> it would be better to get dedicated spurious irq tracepoints.

The number of spurious irqs are not interesting - we track them in
/proc/interrupts. The duration of the disturbances are, and they were big
enough for people to see them in certain HPC loops.

Anton
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