Messages in this thread | | | Date | Tue, 8 Nov 2016 14:14:30 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH] perf/x86: Fix overlap counter scheduling bug |
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On Tue, Nov 08, 2016 at 01:20:39PM +0100, Peter Zijlstra wrote:
SNIP
> Now, I would much rather solve this by changing the constraint like the > below, that yields: > > 0x01 - 0001 > 0x03 - 0011 > > 0x0c - 1100 > > Which is two distinct groups, only one of which has overlap. And the one > with overlap only has 2 overlapping masks, giving a max reties of 1.
works for me..
thanks, jirka
> > > diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c > index 272427700d48..71bc348736bd 100644 > --- a/arch/x86/events/intel/uncore_snbep.c > +++ b/arch/x86/events/intel/uncore_snbep.c > @@ -669,7 +669,7 @@ static struct event_constraint snbep_uncore_cbox_constraints[] = { > UNCORE_EVENT_CONSTRAINT(0x1c, 0xc), > UNCORE_EVENT_CONSTRAINT(0x1d, 0xc), > UNCORE_EVENT_CONSTRAINT(0x1e, 0xc), > - EVENT_CONSTRAINT_OVERLAP(0x1f, 0xe, 0xff), > + UNCORE_EVENT_CONSTRAINT(0x1f, 0xc); /* should be 0x0e but that gives scheduling pain */ > UNCORE_EVENT_CONSTRAINT(0x21, 0x3), > UNCORE_EVENT_CONSTRAINT(0x23, 0x3), > UNCORE_EVENT_CONSTRAINT(0x31, 0x3),
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