linux-kernel - Re: [patch 0/4] Port KVM-trace to tracepoints

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Message-ID: <y0m4p6h8zkz.fsf@ton.toronto.redhat.com>
Date:	Tue, 22 Jul 2008 15:54:04 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Avi Kivity <avi@...ranet.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>, kvm@...r.kernel.org
Subject: Re: [patch 0/4] Port KVM-trace to tracepoints

Avi Kivity <avi@...ranet.com> writes:

> [...]
>> Have you considered using trace_mark() directly - eliminating the
>> KVM_TRACEN() middlemen?
> [...]
> Using trace_mark() directly -- looking at it, seems to fit the
> requirements exactly.  Should have looked at it earlier.  Is there a
> way to get a list of all markers?

>From kernel-space, I can't find just now an API for listing them, but
there probably is / could be one.

>From user-space, lttng tools can probably do it.  systemtap can too:
     % stap -l 'kernel.mark("*")'

You could prototype binary tracing thusly:
     % stap -e 'probe kernel.mark("kvm_foobar") { 
         printf("%4b%4b%4b", # three 4-byte ints
                cpu(), $arg1, $arg2)
       }'

> Perhaps the kvmtrace marker->relay integration should be made a marker
> feature, since there is nothing specific to kvm in it.

Right, I believe something like that is in the lttng patch suite.


- FChE
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