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[Bug runtime/5194] IO problem on begin/end probes; need
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 21 Jan 2008 18:12:21 -0000
- Subject: [Bug runtime/5194] IO problem on begin/end probes; need
- References: <20071018140048.5194.hunt@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From fche at redhat dot com 2008-01-21 18:12 -------
(In reply to comment #6)
> (In reply to comment #5)
> > I'm not clear about whether there actually exists a bug described
> > in comment #0, in that we do not enable sleeping or preemption
> > during begin/end probes, so we can't switch CPUs.
>
> We don't? News to me. It's easy to test.
> [...]
> in_interrupt:0, irqs_disabled:0, preempt_count:0
Thanks for running the test.
The preempt_count should not be 0.
The generated code in enter_begin_probe clearly contains
a preempt_disable(), so the question is why this does not
appear to have effect.
--
What |Removed |Added
----------------------------------------------------------------------------
Summary|IO problem on begin/end |IO problem on begin/end
|probes |probes; need
http://sourceware.org/bugzilla/show_bug.cgi?id=5194
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