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[Bug 809131] New: oprofile wedges kernel
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 13 Mar 2013 11:16:39 +0000
  • Message-id: <bug-809131-21960@http.bugzilla.novell.com/>

https://bugzilla.novell.com/show_bug.cgi?id=809131

https://bugzilla.novell.com/show_bug.cgi?id=809131#c0


Summary: oprofile wedges kernel
Classification: openSUSE
Product: openSUSE 12.2
Version: Final
Platform: Other
OS/Version: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Kernel
AssignedTo: kernel-maintainers@xxxxxxxxxxxxxxxxxxxxxx
ReportedBy: mmeeks@xxxxxxxx
QAContact: qa-bugs@xxxxxxx
Found By: ---
Blocker: ---


I try to profile libreoffice with callgraph information after digging around it
seems I need to do this:

# setup:
sudo opcontrol --deinit
sudo bash -c "echo 0 > /proc/sys/kernel/nmi_watchdog"
sudo opcontrol --init
sudo opcontrol --no-vmlinux
sudo opcontrol --callgraph=10
sudo opcontrol --event=CPU_CLK_UNHALTED:500000
# sudo opcontrol --separate=none

# run:
cd /usr/lib/libreoffice/program/
sudo opcontrol --reset
sudo opcontrol -s
OOO_EXIT_POST_STARTUP=1 ./soffice -writer
sudo opcontrol -t

Unfortunately the kernel wedges / I get a beautiful switch-to-console
crash-dump thing (but no doubt anyone can repeat that).

I added the --event=CPU... stuff to try to slow down profiling - the default
caused the problem too.

Thoughts / advice much appreciated - it's my 1st time trying to use oprofile-
and without the callgraph data it's not possible to collate profiles from
multiple shared libraries into a single tree it seems (?).

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