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Do you know where it comes from? > > We measured the lruvec spinlock start, end and hold > time(htime) using sched_clock(), along with a BUG() if the hold time was > more than 10s. The below case shows that lruvec spin lock was held for ~25s. > What is more unusual could be observed perhaps with your hardware config but with 386MiB RAM assigned to each node, the so called tight memory but not extremely tight.