Messages in this thread | | | Date | Tue, 10 May 2011 16:59:02 +0200 | From | "Roedel, Joerg" <> | Subject | Re: [PATCH 1/3] perf, core: Introduce attrs to count in either host or guest mode |
| |
On Tue, May 10, 2011 at 10:45:46AM -0400, Peter Zijlstra wrote: > On Tue, 2011-05-10 at 16:35 +0200, Joerg Roedel wrote: > > + /* Can't exclude counting in guest and in host mode */ > > + if (attr.exclude_host && attr.exclude_guest) > > + return -EINVAL; > > Why not?
By definition the counter won't count at all. The hardware just ignores the bits if they are both set. My rationale here was that it does not makes sense to setup a counter and exclude guest and host mode.
Joerg
| |