Re: [Xen-devel] [PATCH] tools: delete gtraceview and gtracestat

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Sep 02, 2016 at 12:05:49PM +0100, George Dunlap wrote:
> On 30/08/16 13:50, Ian Jackson wrote:
> > Wei Liu writes ("[PATCH] tools: delete gtraceview and gtracestat"):
> >> There has not been any substantial update to them since 2011. My quick
> >> check shows that they don't work.
> >>
> >> Just delete them. It would be easy to resurrect them from git log should
> >> people still need them.
> > 
> > I'm not sure what these are.  git log is not particularly
> > illuminating.  gtraceview.c and some of the commit messages talk about
> > "Cx events" or "x86 Cx" and there is an Intel copyright notice, but
> > not Intel email addresses.
> > 
> > There is also some discussion of xentrace in the source code.
> > 
> > Are these the only in-tool consumer of some kind of hypervisor
> > -generated or -mediated data ?  If so it should be retained IMO, or
> > the corresponding hypervisor code removed too.
> > 
> > I have added George to the CC in the hope that he may know more...
> 
> Well I'd never looked at it before, but it does indeed seem to be
> something about skimming through xentrace records.
> 
> The help for both functions says to run "xentrace -e 0x80f000", which
> will capture all events of type TRC_HW, which includes TRC_PM.  The code
> (again for both) then seems to parse events of type TRC_PM_IDLE_ENTRY,
> TRC_PM_IDLE_EXIT, and TRC_PM_FREQ_CHANGE.
> 
> gtraceview seems to be an ncurses-based browser; gtracestat seems to be
> a xenalyze-style statistical analysis thing.
> 
> So it would seem to be the case that they consume hypervisor-generated
> data, but they are not the *only* consumers of that data
> (xentrace_format and xenalyze being the other ones).
> 
> When you say they "don't work", what do you mean?
> 

Tried to run it. It failed to produce anything useful. It is bit-rotten.

Wei.

>  -George

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