diff options
| author | Joonwoo Park <joonwoop@codeaurora.org> | 2017-06-01 10:59:12 -0700 |
|---|---|---|
| committer | Suren Baghdasaryan <surenb@google.com> | 2017-07-12 21:01:07 +0000 |
| commit | d368c6faa19ba98d26e713d3bf258cc6466d8ac2 (patch) | |
| tree | cc06218e8f578a272060e0ca08d8162f237bbbb2 /kernel/sched/walt.c | |
| parent | 97841e574afb85dca93016347efee005d8150efc (diff) | |
sched: walt: fix window misalignment when HZ=300
Due to rounding error hrtimer tick interval becomes 3333333 ns when HZ=300.
Consequently the tick time stamp nearest to the WALT's default window size
20ms will be also 19999998 (3333333 * 6).
Change-Id: I08f9bd2dbecccbb683e4490d06d8b0da703d3ab2
Suggested-by: Joel Fernandes <joelaf@google.com>
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel/sched/walt.c')
| -rw-r--r-- | kernel/sched/walt.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched/walt.c b/kernel/sched/walt.c index 6e053bd9830c..92c3aae8e056 100644 --- a/kernel/sched/walt.c +++ b/kernel/sched/walt.c @@ -72,7 +72,15 @@ static cpumask_t mpc_mask = CPU_MASK_ALL; __read_mostly unsigned int walt_ravg_window = 20000000; /* Min window size (in ns) = 10ms */ +#ifdef CONFIG_HZ_300 +/* + * Tick interval becomes to 3333333 due to + * rounding error when HZ=300. + */ +#define MIN_SCHED_RAVG_WINDOW (3333333 * 6) +#else #define MIN_SCHED_RAVG_WINDOW 10000000 +#endif /* Max window size (in ns) = 1s */ #define MAX_SCHED_RAVG_WINDOW 1000000000 |