linux-kernel - Re: trace-cmd errors on kvm events

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Date:	Sat, 09 Apr 2011 01:42:14 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	David Ahern <dsahern@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	KVM mailing list <kvm@...r.kernel.org>
Subject: Re: trace-cmd errors on kvm events

On 2011-04-09 01:26, David Ahern wrote:
> On 04/08/11 15:18, Jan Kiszka wrote:
>> Let me check... indeed, I'm getting the same file-not-found here with
>> trace-cmd.git 9cce1c9b5b when starting it directly from its build directory.
>>
>> But maybe your trace-cmd or kernel versions are too old / incompatible.
>> I'm not getting complaints about unparseable events with the above
>> snapshot and 2.6.38.
> 
> 2.6.38.2 kernel, trace-cmd 3e8b5b8 which is March 18 (though git pull
> done this morning).
> 
> For grins I checked-out 9cce1c9b5b and same error:
> trace-cmd record -e kvm -- sleep 1
> trace-cmd report 2>&1  | less
> 
> You do have to put stderr onto stdout to see the messages I reported
> earlier. Or look for [FAILED TO PARSE] on the kvm_exit and
> kvm_emulate_insn lines.

I did that.

What I also did is updating trace-cmd git and then reinstalling the
latest plugins: make install_plugins prefix=$HOME. They then end up in
$HOME/.trace-cmd/plugins. Now I do not have a single error message
anymore, including that file not found.

Jan


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