On Mon, 2017-07-31 at 08:02:41 UTC, Madhavan Srinivasan wrote:

There are some hardware events on Power systems which only
count when the processor is not idle, and there are some
fixed-function counters which count such events. For example,
the "run cycles" event counts cycles when the processor is
not idle. If the user asks to count cycles, we can use
"run cycles" if this is a per-task event, since the processor
is running when the task is running, by definition. We can't
use "run cycles" if the user asks for "cycles" on a system-wide
counter.

Currently in power8 this check is done using PPMU_ONLY_COUNT_RUN
flag in power8_get_alternatives() function. Based on the
flag, events are switched if needed. This function should
also be enabled in power9, so factor out the code to
isa207_get_alternatives().

Fixes: efe881afdd999 ('powerpc/perf: Factor out event_alternative function')
Reported-by: Anton Blanchard <redacted>
Signed-off-by: Madhavan Srinivasan <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/70a7e720998d5beaf0c8abd945234e

cheers