linux-kernel - Re: kvmmmu tracing

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Message-Id: <1258988338.31359.147.camel@localhost.localdomain>
Date:	Mon, 23 Nov 2009 09:58:58 -0500
From:	Steven Rostedt <srostedt@...hat.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	kvm <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: kvmmmu tracing

On Mon, 2009-11-23 at 12:06 +0100, Johannes Berg wrote:
> Commit f691fe1da7e2715137d21ae5a80bec64db4625db is really broken wrt.
> the userspace interface for tracing because of the weird
> KVM_MMU_PAGE_PRINTK macro.
> 
> Maybe we should have a "unsafe for export" flag for events, if they do
> strange things like that?
> 
> As it stands, I can't use trace-cmd on an x86 machine that has kvm
> enabled because it will try to read all the kvm stuff. Arguably, it
> should only try to parse it when it needs it (i.e. not for me) but still
> it's very inconvenient to export something to userspace that it cannot
> possibly understand.

Note, I updated trace-cmd. I still does not read this macro nicely, but
it at least does not fail anymore.

-- Steve


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