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Re: Tracing block devices (was: Re: [Qemu-devel] Static tracepoint contr


From: Christoph Hellwig
Subject: Re: Tracing block devices (was: Re: [Qemu-devel] Static tracepoint control via trace-event)
Date: Thu, 21 Oct 2010 07:20:27 +0200
User-agent: Mutt/1.3.28i

On Tue, Oct 19, 2010 at 03:29:51PM +0100, Richard W.M. Jones wrote:
> On Tue, Oct 19, 2010 at 03:59:36PM +0200, Jan Kiszka wrote:
> > Once we have "-trace events=...", defining the list of active
> > tracepoints before starting qemu will be trivial (e.g. via a config
> > file). Of course, this requires that all tracepoints are built-in...
> 
> Sorry that I've not been following this very closely, but does this
> sort of thing allow tracing reads and writes to block devices?  Am I
> right in thinking that if a tracepoint existed in the right place, one
> could get a log file from that which could be post-processed in
> another tool?

I don't think it does.  But I have a patch that I need to update which
outputs traces in the form of the Linux blktrace block I/O tracing tool,
which does exactly what you need (and more).  You can simply use
all the blktrace-enabled tools, including seekwatcher on it.




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