linux-kernel - RE: [PATCH V2 0/2] measure SMI cost (user)

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Date:   Mon, 29 May 2017 17:06:10 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>, Peter Zijlstra <peterz@...radead.org>
CC:     "acme@...nel.org" <acme@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "eranian@...gle.com" <eranian@...gle.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "elliott@....com" <elliott@....com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: RE: [PATCH V2 0/2] measure SMI cost (user)


> 
> On Mon, May 29, 2017 at 02:52:39PM +0200, Peter Zijlstra wrote:
> > On Mon, May 29, 2017 at 02:46:37PM +0200, Jiri Olsa wrote:
> >
> > > for some reason I can't get single SMI count generated, is there a
> > > setup/bench that would provoke that?
> >
> > Not having SMIs is a good thing ;-)
> >
> > Not sure we can tickle them in a reliable way.
> 
> yea I saw some counts last time, now just zero so I was wondering if it's
> working
> 

We have internal test case which can generate SMI, but I cannot publish
the test case. Sorry about that.

The example in the change log is from the real test (Only the SMI cycles%
number is fake). I believe it works.

Thanks,
Kan