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| author | Vincent Guittot <vincent.guittot@linaro.org> | 2023-04-11 11:06:11 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-04-12 16:46:30 +0200 |
| commit | 91dcf1e8068e9a8823e419a7a34ff4341275fb70 (patch) | |
| tree | ef17c6282989ffebc78319863054b07d189fd18a | |
| parent | 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d (diff) | |
| download | linux-stable-91dcf1e8068e9a8823e419a7a34ff4341275fb70.tar.gz linux-stable-91dcf1e8068e9a8823e419a7a34ff4341275fb70.tar.bz2 linux-stable-91dcf1e8068e9a8823e419a7a34ff4341275fb70.zip | |
sched/fair: Fix imbalance overflow
When local group is fully busy but its average load is above system load,
computing the imbalance will overflow and local group is not the best
target for pulling this load.
Fixes: 0b0695f2b34a ("sched/fair: Rework load_balance()")
Reported-by: Tingjia Cao <tjcao980311@gmail.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Tingjia Cao <tjcao980311@gmail.com>
Link: https://lore.kernel.org/lkml/CABcWv9_DAhVBOq2=W=2ypKE9dKM5s2DvoV8-U0+GDwwuKZ89jQ@mail.gmail.com/T/
| -rw-r--r-- | kernel/sched/fair.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6986ea31c984..5f6587d94c1d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10238,6 +10238,16 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s sds->avg_load = (sds->total_load * SCHED_CAPACITY_SCALE) / sds->total_capacity; + + /* + * If the local group is more loaded than the average system + * load, don't try to pull any tasks. + */ + if (local->avg_load >= sds->avg_load) { + env->imbalance = 0; + return; + } + } /* |