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xen-devel
Re: [Xen-devel] RE: [PATCH] Xenoprof passive domain support fixes
Hi Renato,
On Tuesday 11 July 2006 15:51, Santos, Jose Renato G wrote:
> Ray,
>
<snip>
> >> Additionally, I find that "opreport -lx" will report "no symbols" for
> >> papps*-syms:
> >>
> >> samples % app name symbol name
> >> 76273 23.7738 papps2-syms (no symbols)
> >> 19131 5.9630 pxen2-syms l2e_rw_fault
> >> 17278 5.3854 jbd (no symbols)
> >> 12228 3.8114 ext3 (no symbols)
> >> 11840 3.6905 libc-2.4.so vfprintf
> >> 10256 3.1967 libc-2.4.so
> >> _IO_file_xsputn@@GLIBC_2.2.5
> >> 8587 2.6765 xen-syms general_protection
> >> 7374 2.2984 pxen2-syms vmx_asm_vmexit_handler
> >> 5212 1.6245 pxen2-syms resync_all
> >> 5128 1.5984 xen-syms write_cr3
> >> <snip>
> >>
> >> unless I do an "ln -s /boot/vmlinux2-syms
> >> /boot/papps2-syms". (It appears that opreport should be
> >> creating papps2-syms instead of vmlinux2-syms??)
>
> papps2-syms represent samples collected in user level for domain2 (i.e.
> ring 3). Remember that passive domain profiling cannot decode
> application level samples since domain0 does not know the current memory
> mappings of user level processes in domain 2. Therefore it is expected
> that opreport will report "no symbols" for papps2-syms.
>
I see. Oops. :-)
> What is suspicious to me is that opreport is not reporting any samples
> in the kernel for domain2 (they should have appeared under the name
> vmlinux2-syms)
Perhaps you meant pvmlinux2-syms here?
> This is probably a bug. Maybe this is triggered if you do not specify
> the option --passive-images. Did you specify this option? If not, try
> running the command with --passive-images=<linux image file for xenU>
> (e.g. --passive-images=/boot/vmlinux-syms-2.6.16-xenU)
>
Yes, here is the setup script:
opcontrol
--vmlinux=/home/raybry/xenbits-unstable.$cs.hg/linux-2.6.16.13-xen/vmlinux
opcontrol --start-daemon --active-domains=0 --passive-domains=$passive \
--passive-images=/home/raybry/RH4U2/vmlinux \
--xen=/home/raybry/xenbits-unstable.$cs.hg/xen/xen-syms \
--verbose=all --event=GLOBAL_POWER_EVENTS:100000:1:1:1
where $cs is the current change set I am running and $passive is the passive
domain id.
Of course, the actual image file for an HVM guest is stored in the / file
system of the
guest, which in this case is a loopback mounted file. So the vmlinux
referenced above
is a copy of that file in the host's file system.
There are no samples attributed to pvmlinux2-syms in the oprofiled.log. There
are
lots of samples attributed to papps2-syms.
Now this is all with your patches applied to change set 10428. It's possible,
I suppose,
that there are some subtle differences making this incorrect at that change set
level.
I'll move up to a more recent change set and try again. Also, I "ported" your
oprofile
changes forward to 0.9.1, so I could have messed that up. See the message I
sent to Markus
on xen-devel for a copy of my version of your
> >> Finally, I'm not convinced yet that the sample reports for
> >> the HVM guest (papps2-syms or pvmlinux2-syms, in this case)
> >> are correct. I'm going to run some native and xen profile
> >> sessions using the same benchmark and see if I can correlate
> >> the results at all.
>
> There is a problem with the current version of xenoprof for passive
> domains. Samples are being assigned to wrong samples. I posted a patch
> last week, that fix this problem but it seems that it was not pushed
> into the main unstable tree yet.
> Try applying that patch and check if they match what you get from
> native.
> (If you cannot find the patch, please let me know I will forward it to
> you)
> I would appreciate if you could send me the results of your tests,
> either if you find problems or if they are successfull. I think not many
> people have used passive domain support yet, and any feedback would be
> usefull.
I am running with your patches from 2006-07-07 3:15:15 for both xen and
oprofile.
However, as stated above, I am running under changeset 10428. Let me upgrade
and try again.
>
> Thanks
>
> Renato
Thank you!
Best Regards,
--
Ray Bryant
AMD Performance Labs Austin, Tx
512-602-0038 (o) 512-507-7807 (c)
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