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[Bug lket/4420] systemtap.samples/lket.exp test crashing RHEL4U4 machine
- From: "prasanna at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 25 Jul 2007 13:01:02 -0000
- Subject: [Bug lket/4420] systemtap.samples/lket.exp test crashing RHEL4U4 machine
- References: <20070424200707.4420.wcohen@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From prasanna at in dot ibm dot com 2007-07-25 13:01 -------
Possible solutions:
1. Use robust fault handling mechanism for handler which access user address space
and chances of such handler causing page-faults are high. Robust fualt handling
mechanism will recover from such faults.
2. Black list __switch_to() routine and do not allow probes on them.
3. Restrick the probe handler to __switch_to(), so that probes on __switch_to()
can be still allowed.
4. Use static markers for __switch_to() routines.
It makes more sense to identify routines that get frequently executed in the
hot path and use static markers to collect instrumenation data.
cc'ing Josh
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What |Removed |Added
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CC| |jkenisto at us dot ibm dot
| |com, joshua dot i dot stone
| |at intel dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=4420
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