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xen-devel
RE: [Xen-devel] Compiling xenoprof
David,
You are not able to run oprofile on domU only.
The current model supported for XenOProfile is system-wide
profiling, i.e. profiling multiple domains, using the same
hardware counters. In this model
Dom0 has to be the coordinator of a profiling session.
You have to first start oprofile daemon in dom0 indicating which
domains are participating in the profiling session. Then you
need to run "opcontrol --start" in each domU, and finally
start profiling from dom0 (opcontrol --start).
Look at the user guide in http://xenoprof.sourceforge.net
for more details
Renato
>> -----Original Message-----
>> From: David Carr [mailto:dc@xxxxxxxxx]
>> Sent: Wednesday, April 05, 2006 9:20 AM
>> To: Santos, Jose Renato G
>> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] Compiling xenoprof
>>
>> Renato,
>>
>> Thanks for your reply. The steps below got the kernels to
>> build. I'm not sure that everything is quite right yet
>> though. I can profile on domain 0 and also run opcontrol
>> --reset on the guests. However running "opcontrol --start"
>> on the guests results in:
>>
>> Using default event: GLOBAL_POWER_EVENTS:100000:1:1:1 Failed
>> to open profile device: Operation not permitted Using 2.6+
>> OProfile kernel interface.
>>
>> Couldn't start oprofiled.
>> Check the log file "/var/lib/oprofile/oprofiled.log" and
>> kernel syslog
>>
>> It appears that this error is coming daemon/liblegacy/init.c
>> or daemon/init.c This error only occurs on the guests (which
>> are using the dom0 kernel).
>> opcontrol --start suceeds on dom0.
>>
>> Any ideas?
>>
>> Thanks again,
>> David Carr
>>
>> Install steps:
>>
>> In Xen 3.0.0 source directory:
>>
>> patch -p1 < xenoprof-2.0-xen-3.0.0.patch patch -p1 <
>> xenoprof-2.0-linux-2.6-sparse.patch
>> make kernels
>>
>> This will ultimately fail. Then do:
>>
>> In linux-2.6.12-xen0 directory:
>>
>> patch -p2 < xenoprof-2.0-linux-2.6.12.patch make kernels
>>
>> This will ultimately fail. Then do:
>>
>> In linux-2.6.12-xenU directory:
>>
>> patch -p2 < xenoprof-2.0-linux-2.6.12.patch make kernels
>>
>> This will succeed. Then do:
>>
>> make dist
>> sudo make install
>>
>>
>> In oprofile source directory:
>>
>> patch -p1 < oprofile-0.9.1-xen.patch
>>
>>
>> Install oprofile normally
>>
>>
>> Santos, Jose Renato G wrote:
>>
>> >
>> >David,
>> >
>> >You are right. This is not very clean.
>> >Yes, you need to do a "make" to create the xen0 and xenU
>> trees before
>> >applying the patch in step c).
>> >If you configure the kernel with oprofile support (CONFIG_OPROFILE)
>> >before step c) you will probably get a compilation error
>> when you run
>> >make since the patch was not applied yet. You could either delay
>> >setting (CONFIG_OPROFILE) for after you apply patch "c" or you can
>> >apply the patch after you get the compilation error, and
>> then run make
>> >again.
>> >
>> >It would be better if there was a "make" option to create
>> the xen0/xenU
>> >trees without compiling them. Does anybody know if there is such an
>> >option? I remember looking for it in the Makefile and not
>> finding it,
>> >but this was a while ago.
>> >
>> >We are now working on getting the xenoprof code included in
>> >xen-unstable.
>> >This should make life much easier for those wanting to use oprofile.
>> >
>> >Renato
>> >
>> >
>> >
>> >>>-----Original Message-----
>> >>>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>> >>>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of David
>> >>>Carr
>> >>>Sent: Tuesday, April 04, 2006 7:31 PM
>> >>>To: xen-devel@xxxxxxxxxxxxxxxxxxx
>> >>>Subject: [Xen-devel] Compiling xenoprof
>> >>>
>> >>>I'm having some trouble compiling Xen 3.0.0 with the xenoprof
>> >>>patches.
>> >>>
>> >>>The xenoprof instructions say:
>> >>>
>> >>> In order to run OProfile in Xen environments four patches are
>> >>>needed:
>> >>> a) xenoprof-2.0-xen-3.0.0.patch
>> >>> Patch for Xen hypervisor.
>> >>> b) xenoprof-2.0-linux-2.6-sparse.patch
>> >>> Patch for Xenolinux. Contains oprofile architecture specific
>> >>>driver
>> >>> for xen (Apply to linux-sparse tree in Xen source tree)
>> >>> c) xenoprof-2.0-linux-2.6.12.patch
>> >>> Patch for oprofile kernel module in linux 2.6.12.
>> >>>Contain modifications
>> >>> to generic oprofile driver code to support xen.
>> (Apply twice,
>> >>>once to
>> >>> dom0 and once to domU trees)
>> >>>
>> >>>
>> >>>Every thing goes fine until part c. The linux-2.6.12-xen0 and
>> >>>linux-2.6.12-xenU directories are empty until you build xen (and
>> >>>therefore can't be patched yet.) Doing a make world will
>> populate
>> >>>these trees but also compiles everything.
>> >>>
>> >>>What is the proper sequence of patching and make commands
>> to build a
>> >>>xenoprof tree?
>> >>>
>> >>>Thanks,
>> >>>David Carr
>> >>>
>> >>>
>> >>>
>> >>>_______________________________________________
>> >>>Xen-devel mailing list
>> >>>Xen-devel@xxxxxxxxxxxxxxxxxxx
>> >>>http://lists.xensource.com/xen-devel
>> >>>
>> >>>
>> >>>
>>
>>
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