From: Naresh Rapolu <nrapolu@purdue.edu>
To: xen-devel@lists.xensource.com
Subject: boot_cpu_data differs between Xen hypervisor boot and normal pv_ops kernel boot
Date: Wed, 31 Mar 2010 11:29:04 -0400 [thread overview]
Message-ID: <4BB36A40.1080903@purdue.edu> (raw)
Hello,
After booting the xen-stable 2.6.32.10 pv_ops kernel from jeremy git
tree with Xen-4.0.0-rc8 installed,
dmesg | grep PMU shows :
Performance Events : unsupported p6 CPU model 26 no PMU driver, software
events only.
PMU:oprofile: found i386/core_i7.
If I boot the same compiled kernel, without Xen installed, dmesg | grep
PMU shows :
Performance Events : Nehalem/Corei7 events, Intel PMU driver.
PMU:oprofile: found i386/core_i7.
When I looked into the source code, arch/x86/kernel/cpu/perf_event.c,
at run-time boot_cpu_data structure seems to differ in these two forms
of booting.
Due to this, Iam not able to use the hardware performance counters in
my Xeon 5530 processor as hardware events(cache-misses etc) are being
disabled.
Is there any reason for this ?
Any help is appreciated.
Thanks,
Naresh Rapolu.
next reply other threads:[~2010-03-31 15:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-31 15:29 Naresh Rapolu [this message]
2010-03-31 15:43 ` boot_cpu_data differs between Xen hypervisor boot and normal pv_ops kernel boot Pasi Kärkkäinen
2010-03-31 17:51 ` Naresh Rapolu
2010-03-31 18:14 ` Jeremy Fitzhardinge
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