Re: [Xen-devel] [PATCH] Oprofile patch for 2.6.27 tree. Fix collisionbetween Xen and Cell processor escape codes

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

I'm a little confused by this: Upstream oprofile 0.9.4 has the same workaround 
implemented on the user mode side of things, so adjusting this in the kernel 
now would make the kernel incompatible with that and future versions. Jan

>>> "Santos, Jose Renato G" <joserenato.santos@xxxxxx> 23.06.09 20:13 >>>

Steven

This is a fix to enable Oprofile to work on the netchannel2 2.6.27 tree.

This is to address a collision for escape codes used to represent domain 
switches in Xen and CPU switches in cell processors which were developed in 
parallel and used the same code.

There was a discussion on the Oprofile mailing list a while ago and it was 
decided that we would use different Oprofile codes for x86 and ia64 archs 
(which are the only ones that support Oprofile in Xen) in order to preserve 
backward compatibility for users.

The Oprofile user level tools expect different escape codes depending on the 
architecture. We need to make sure the kernel generates compatible escape codes.

I think this should be also pushed to the 2.6.27 XenClient tree.

Thanks

Renato


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel