Messages in this thread Patch in this message | | | From | qiwuchen55@gmail ... | Subject | [PATCH] sched/pelt: use shift operation instead of division operation | Date | Mon, 24 Feb 2020 11:30:55 +0800 |
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From: chenqiwu <chenqiwu@xiaomi.com>
Use shift operation to calculate the periods instead of division, since shift operation is more efficient than division operation.
Signed-off-by: chenqiwu <chenqiwu@xiaomi.com> --- kernel/sched/pelt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index bd006b7..ac79f8e 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -114,7 +114,7 @@ static u32 __accumulate_pelt_segments(u64 periods, u32 d1, u32 d3) u64 periods; delta += sa->period_contrib; - periods = delta / 1024; /* A period is 1024us (~1ms) */ + periods = delta >> 10; /* A period is 1024us (~1ms) */ /* * Step 1: decay old *_sum if we crossed period boundaries. -- 1.9.1
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