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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-07-08 13:15:57 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-07-14 12:14:27 -0400 |
| commit | f3cf800778e9e76b2387d00c9bfbc2e16efdb7ed (patch) | |
| tree | 783e27546a8d65df254f59b5a024dc42eb390582 /include/linux/sched.h | |
| parent | b8917b4ae44d1b945f6fba3d8ee6777edb44633b (diff) | |
| parent | cd4220d23bf3f43cf720e82bdee681f383433ae2 (diff) | |
Merge tag 'kvm-s390-master-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
KVM: selftests: Fixes
- provide memory model for IBM z196 and zEC12
- do not require 64GB of memory
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d2c881384517..28a98fc4ded4 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -350,11 +350,19 @@ struct load_weight { * Only for tasks we track a moving average of the past instantaneous * estimated utilization. This allows to absorb sporadic drops in utilization * of an otherwise almost periodic task. + * + * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg + * updates. When a task is dequeued, its util_est should not be updated if its + * util_avg has not been updated in the meantime. + * This information is mapped into the MSB bit of util_est.enqueued at dequeue + * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg + * for a task) it is safe to use MSB. */ struct util_est { unsigned int enqueued; unsigned int ewma; #define UTIL_EST_WEIGHT_SHIFT 2 +#define UTIL_AVG_UNCHANGED 0x80000000 } __attribute__((__aligned__(sizeof(u64)))); /* |