linux-kernel - Re: [PATCH 2/3] perf trace: Update eval_flag() flags array to match interrupt.h

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Date:	Tue, 6 Oct 2009 17:19:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Tom Zanussi <tzanussi@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, rostedt@...dmis.org, lizf@...fujitsu.com
Subject: Re: [PATCH 2/3] perf trace: Update eval_flag() flags array to
	match interrupt.h

On Tue, Oct 06, 2009 at 09:27:32AM -0400, Christoph Hellwig wrote:
> On Tue, Oct 06, 2009 at 01:00:48AM -0500, Tom Zanussi wrote:
> > Add missing BLOCK_IOPOLL_SOFTIRQ entry.
> 
> Nothing against your patch which is good for the short term, but the
> existance of this code is a major design flaw.  The trace events are
> supposed to be self describing and having them duplicated in the trace
> tool means either we're not using that self-description or it's not
> good enough to be used.
> 
> We'll soon add a lot more flags (e.g. my xfs tracing patch if I can ever
> get the formal maintainer to review it will add various), and it was
> also made pretty clear that perf while packaged with the kernel should
> work independent of the actual kernel version, e.g. one perf binary
> should work with older host kernels too which might have very different
> flag values.
> 


Yeah. We may want to do that by including trace/events/irq.h
and then use the show_softirq_name() macro defined there.

The rest of the header can be wrapped through no-op macros and
stub includes.

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