On Wed, Sep 12, 2012 at 7:45 PM, Peter Zijlstra <pet...@infradead.org> wrote:
> On Wed, 2012-09-12 at 19:37 +0200, Peter Zijlstra wrote:
>> Ah, so I do think EIO will re-enable LBR,
>
> OK, it does not, but the:
>
>> also the handler is wrapped in
>> x86_pmu::{dis,en}able_all() which does end up calling
>> intel_pmu_lbr_{dis,en}able_all().
>
> Thing does the re-enable for us,
>
>> However that leaves the MSR in the
>> exact same state on exit as it was on enter, so that's not a problem for
>> the: read-modify-write change.
>
> in a safe way.
Well, I think it does even when we have to stop events (x86_pmu_stop)
because the buffer is full. Looks like we always re-enable lbr. So looks
like the handler is a wash for debugctl.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
