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[Bug translator/9930] produce more information about probe reentrancy
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 7 Mar 2009 23:57:23 -0000
- Subject: [Bug translator/9930] produce more information about probe reentrancy
- References: <20090307172813.9930.fche@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From fche at redhat dot com 2009-03-07 23:57 -------
> Wouldn't we avoid most of this trouble by running probe handlers with interrupts
> disabled?
Some, but not all.
> I know we changed this for #6899, but here we have an example of how
> that change can be painful...
Reentrance can occur in other ways too - from probed code reached
from an NMI or from the runtime. So we still have to protect against
it.
We could make it more configurable -- to let a sysadmin/script writer
state a preference between the status quo vs. blocked interrupts and
associated greater latency, in order to have fewer skipped probes.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9930
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