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bc09c219b2
If a PMC is about to overflow on a counter that's on an active perf event (ie. less than 256 from the end) and a _different_ PMC overflows just at this time (a PMC that's not on an active perf event), we currently mark the event as found, but in reality it's not as it's likely the other PMC that caused the IRQ. Since we mark it as found the second catch all for overflows doesn't run, and we don't reset the overflowing PMC ever. Hence we keep hitting that same PMC IRQ over and over and don't reset the actual overflowing counter. This is a rewrite of the perf interrupt handler for book3s to get around this. We now check to see if any of the PMCs have actually overflowed (ie >= 0x80000000). If yes, record it for active counters and just reset it for inactive counters. If it's not overflowed, then we check to see if it's one of the buggy power7 counters and if it is, record it and continue. If none of the PMCs match this, then we make note that we couldn't find the PMC that caused the IRQ. Signed-off-by: Michael Neuling <mikey@neuling.org> Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> cc: Paul Mackerras <paulus@samba.org> cc: Anton Blanchard <anton@samba.org> cc: Linux PPC dev <linuxppc-dev@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> |
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