linux-kernel - Re: kvmmmu tracing

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Message-ID: <1259057130.3985.1.camel@johannes.local>
Date:	Tue, 24 Nov 2009 11:05:30 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: kvmmmu tracing

On Tue, 2009-11-24 at 11:50 +0200, Avi Kivity wrote:
> On 11/23/2009 01:06 PM, Johannes Berg wrote:
> > Commit f691fe1da7e2715137d21ae5a80bec64db4625db is really broken wrt.
> > the userspace interface for tracing because of the weird
> > KVM_MMU_PAGE_PRINTK macro.
> >
> >    
> 
> Can you explain what is wrong with it?

It's a big C expression that trace-cmd can't parse :)


> Is userspace reading mmutrace.h?  When the structure attributes can be 
> exported via /sys/kernel/debug/tracing?

Yes ... look
at /sys/kernel/debug/tracing/events/kvmmmu/kvm_mmu_unsync_page/format
for instance.

johannes

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