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Vincent Guittot authored
With commit: 'b7031a02 ("sched/fair: Add NOHZ_STATS_KICK")' rebalance_domains of the local cfs_rq happens before others idle cpus have updated nohz.next_balance and its value is overwritten. Move the update of nohz.next_balance for other idles cpus before balancing and updating the next_balance of local cfs_rq. Also, the nohz.next_balance is now updated only if all idle cpus got a chance to rebalance their domains and the idle balance has not been aborted because of new activities on the CPU. In case of need_resched, the idle load balance will be kick the next jiffie in order to address remaining ilb. Fixes: b7031a02 ("sched/fair: Add NOHZ_STATS_KICK") Reported-by:
Peng Liu <iwtbavbm@gmail.com> Signed-off-by:
Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by:
Valentin Schneider <valentin.schneider@arm.com> Acked-by:
Mel Gorman <mgorman@suse.de> Link: https://lkml.kernel.org/r/20200609123748.18636-1-vincent.guittot@linaro.org
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