From: Avi Kivity <avi@redhat.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: kvm <kvm@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: kvmmmu tracing
Date: Tue, 24 Nov 2009 11:50:46 +0200 [thread overview]
Message-ID: <4B0BAC76.3080202@redhat.com> (raw)
In-Reply-To: <1258974375.7094.158.camel@johannes.local>
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?
> 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.
>
Is userspace reading mmutrace.h? When the structure attributes can be
exported via /sys/kernel/debug/tracing?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-11-24 9:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-23 11:06 kvmmmu tracing Johannes Berg
2009-11-23 14:58 ` Steven Rostedt
2009-11-23 15:46 ` Johannes Berg
2009-11-24 9:50 ` Avi Kivity [this message]
2009-11-24 10:05 ` Johannes Berg
2009-11-24 10:34 ` Avi Kivity
2009-11-24 14:08 ` Johannes Berg
2009-11-24 14:17 ` Avi Kivity
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