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| author | Giovanni Gherdovich <ggherdovich@suse.cz> | 2020-05-31 20:24:52 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-06-15 14:10:02 +0200 |
| commit | 51beea8862a3095559862df39554f05042e1195b (patch) | |
| tree | def1b72a6ceaf020d21c10721ca5c0891bf9cce4 /kernel/sched/psi.c | |
| parent | x86, sched: check for counters overflow in frequency invariant accounting (diff) | |
| download | linux-51beea8862a3095559862df39554f05042e1195b.tar.xz linux-51beea8862a3095559862df39554f05042e1195b.zip | |
x86, sched: Bail out of frequency invariance if turbo frequency is unknown
There may be CPUs that support turbo boost but don't declare any turbo
ratio, i.e. their MSR_TURBO_RATIO_LIMIT is all zeroes. In that condition
scale-invariant calculations can't be performed.
Fixes: 1567c3e3467c ("x86, sched: Add support for frequency invariance")
Suggested-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Giovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://lkml.kernel.org/r/20200531182453.15254-3-ggherdovich@suse.cz
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