linux-kernel - Re: [PATCH] tracing/markers: make markers select tracepoints

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Date:	Sun, 22 Feb 2009 18:13:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Avi Kivity <avi@...hat.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] tracing/markers: make markers select tracepoints


* Frank Ch. Eigler <fche@...hat.com> wrote:

> Ingo Molnar <mingo@...e.hu> writes:
> 
> > [...]
> > there's i think the KVM usecase where markers are used 
> > essentially a printk()-alike flexible tracing facility.
> >
> > [...]
> > ./vmx.c:	KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
> > ./vmx.c:	KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
> > ./vmx.c:	KVMTRACE_0D(PEND_INTR, vcpu, handler);
> >
> > I think this could easily be converted to a wrapper around 
> > ftrace_printk() plus a "kvmtrace" ftrace plugin [...]
> 
> It would be even easier converted to the markers API directly,
> without the KVMTRACE* macro intermediary:
> 
> before:
>         KVMTRACE_3D(MSR_READ, &svm->vcpu, ecx, (u32)data,
>                     (u32)(data >> 32), handler);
> after:
> 	trace_mark(kvmtrace, "MSR_READ: %p, %08lx, %016Lx\n",
>                              &svm->vcpu, ecx, data);
> 
> All this already "just works".

except that we are removing markers.

	Ingo
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