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List:       netbsd-port-xen
Subject:    Re: dom0 kernel profiling on Xen
From:       Thor Lancelot Simon <tls () panix ! com>
Date:       2016-04-12 1:54:01
Message-ID: 20160412015401.GA25293 () panix ! com
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On Mon, Apr 11, 2016 at 04:17:53PM +0200, Manuel Bouyer wrote:
> On Mon, Apr 11, 2016 at 03:50:25PM +0200, Manuel Bouyer wrote:
> >[...]
> > I get a hard hang, it seems that interrupts are not re-enabled.
> > *But* I get the same hard hang with GENERIC, so it seems that profiling
> > is generally broken (at last on amd64) in HEAD these days.
> 
> This is because of the mcount call in __cpu_simple_unlock().
> I don't know why this one doesn't cause a stack overflow.
> 
> I commited a fix for this, and for Xen's mcount helper funtions.
> Kernel profiling in HEAD should work again for bare-metal and Xen guests.

Awesome!  I will get back to work trying to understand where all our CPU
time is going.

Thor
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