linux-kernel - Re: [patch 4/4] KVM-trace port to tracepoints

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Date:	Wed, 23 Jul 2008 12:32:07 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Jan Kiszka <jan.kiszka@...mens.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	"Feng(Eric) Liu" <eric.e.liu@...el.com>
Subject: Re: [patch 4/4] KVM-trace port to tracepoints

Peter Zijlstra wrote:
> There are currently no trace_mark() sites in the kernel that I'm aware
> of (except for the scheduler :-/, and those should be converted to
> tracepoints ASAP).
>
> Andrew raised the whole point about trace_mark() generating an
> user-visible interface and thus it should be stable, and I agree with
> that.
>
> What that means is that trace_mark() can only be used for really stable
> points.
>
> This in turn means we might as well use trace points.
>
> Which allows for the conclusion that trace_mark() is not needed and
> could be removed from the kernel.
>
> However - it might be handy for ad-hoc debugging purposes that never see
> the light of day (linus' git tree in this case). So on those grounds one
> could argue against removing trace_mark

But trace_mark() is so wonderful.  Can't we just declare the tracemarks 
as a non-stable interface?

Perhaps add an unstable_trace_mark() to make it clear.

-- 
error compiling committee.c: too many arguments to function

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