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List: oprofile-list
Subject: oprofile callgraph depth
From: Navjot Singh <singh () research ! avayalabs ! com>
Date: 2010-02-24 19:10:40
Message-ID: 4B8579B0.5010704 () research ! avayalabs ! com
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Hi,<br>
<br>
I am using a RHEL 5.4 x86_64 with 2.6.18.164.11.1 xen kernel on a
machine with Neehalm processor. I have built the user level oprofile
0.9.5 with xenoprof patches for doing the callgraph sample collection.
When I try to set a callgraph depth > 0 the opcontrol gives an error:<br>
<br>
/usr/bin/opcontrol: line 1119: echo: write error: Invalid argument<br>
<br>
After looking through the opcontrol script it seems like it cannot
write to /dev/opcontrol/backtrace_depth. Do you know if oprofile 0.9.5
with xenoprof patch supports the callgraph or not? <br>
<br>
I am using the RHEL 5.4 kernel from the distribution. If the official
kernel does not support callgraph by default do you know what options
I need to enable for building a kernel with this support. <br>
(<i>I have tried the same on a native (non xen) redhat 5.4 with
2.6.18-164.11.1
kernel and I can do callgraphs without any problem)<br>
<br>
</i>Navjot<i><br>
</i>
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