linux-kernel - Re: [PATCH 0/2] adding tracepoints to vhost

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Message-ID: <20120410124250.GB29808@redhat.com>
Date:	Tue, 10 Apr 2012 15:42:51 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Stefan Hajnoczi <stefanha@...il.com>
Cc:	Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 0/2] adding tracepoints to vhost

On Tue, Apr 10, 2012 at 12:40:50PM +0100, Stefan Hajnoczi wrote:
> On Tue, Apr 10, 2012 at 3:58 AM, Jason Wang <jasowang@...hat.com> wrote:
> > To help in vhost analyzing, the following series adding basic tracepoints to
> > vhost. Operations of both virtqueues and vhost works were traced in current
> > implementation, net code were untouched. A top-like satistics displaying script
> > were introduced to help the troubleshooting.
> >
> > TODO:
> > - net specific tracepoints?
> >
> > ---
> >
> > Jason Wang (2):
> >      vhost: basic tracepoints
> >      tools: virtio: add a top-like utility for displaying vhost satistics
> >
> >
> >  drivers/vhost/trace.h   |  153 ++++++++++++++++++++
> >  drivers/vhost/vhost.c   |   17 ++
> >  tools/virtio/vhost_stat |  360 +++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 528 insertions(+), 2 deletions(-)
> >  create mode 100644 drivers/vhost/trace.h
> >  create mode 100755 tools/virtio/vhost_stat
> 
> Perhaps this can replace the vhost log feature?  I'm not sure if
> tracepoints support the right data types but it seems like vhost
> debugging could be done using tracing with less code.
> 
> Stefan

vhost log is not a debugging tool, it logs memory accesses for
migration.
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