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[Xen-devel] xenoprof samples lost due to no mapping

To: xen-devel@xxxxxxxxxxxxxxxxxxx
From: bhavani krishnan <bhavi63@xxxxxxxxx>
Date: Sun, 8 Nov 2009 17:14:05 -0800 (PST)
Delivery-date: Sun, 08 Nov 2009 17:14:33 -0800
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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Hi,

I am trying to do passive profiling of domains in xen. kernel is 2.6.18-128.1.1.el5xen.

I am not getting the domain samples. Below is the oprofiled.log. Samples are being lost due to no mapping and no mm. Can anyone suggest what could be the problem?

When I start the daemon i get the following error but the daemon starts.

opcontrol --start-daemon --passive-domains=1,2,3,4,5

/usr/bin/opcontrol: line 1275: echo: write error: Invalid argument

/usr/bin/opcontrol: line 1118: echo: write error: Invalid argument

Using 2.6+ OProfile kernel interface.

Reading module info.

Using log file /var/lib/oprofile/samples/oprofiled.log

Daemon started.

This is the oprofiled.log file

Nr. sample dumps: 1

Nr. non-backtrace samples: 0

Nr. kernel samples: 0

Nr. lost samples (no kernel/user): 0

Nr. lost kernel samples: 0

Nr. incomplete code structs: 0

Nr. samples lost due to sample file open failure: 0

Nr. samples lost due to no permanent mapping: 0

Nr. event lost due to buffer overflow: 0

Nr. samples lost due to no mapping: 719552

Nr. backtraces skipped due to no file mapping: 0

Nr. samples lost due to no mm: 2467472