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percpu: add a schedule point in pcpu_balance_workfn()

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When a large BPF percpu map is destroyed, I have seen
pcpu_balance_workfn() holding cpu for hundreds of milliseconds.

On KASAN config and 112 hyperthreads, average time to destroy a chunk
is ~4 ms.

[ 2489.841376] destroy chunk 1 in 4148689 ns
...
[ 2490.093428] destroy chunk 32 in 4072718 ns

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Eric Dumazet 2018-02-23 08:12:42 -08:00 committed by Tejun Heo
parent 554fef1c39
commit accd4f36a7
1 changed files with 1 additions and 0 deletions
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mm/percpu.c
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@ -1610,6 +1610,7 @@ static void pcpu_balance_workfn(struct work_struct *work)
spin_unlock_irq(&pcpu_lock);
}
pcpu_destroy_chunk(chunk);
cond_resched();
}
/*