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dma-debug: add a schedule point in debug_dma_dump_mappings() 

debug_dma_dump_mappings() can take a lot of cpu cycles :

lpk43:/# time wc -l /sys/kernel/debug/dma-api/dump
163435 /sys/kernel/debug/dma-api/dump

real	0m0.463s
user	0m0.003s
sys	0m0.459s

Let's add a cond_resched() to avoid holding cpu for too long.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Corentin Labbe <clabbe@baylibre.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Eric Dumazet 2019-10-28 14:56:46 -07:00 committed by Christoph Hellwig
parent 4544b9f25e
commit 9ff6aa027d
1 changed files with 1 additions and 0 deletions
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kernel/dma/debug.c
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@ -420,6 +420,7 @@ void debug_dma_dump_mappings(struct device *dev)
} }
spin_unlock_irqrestore(&bucket->lock, flags); spin_unlock_irqrestore(&bucket->lock, flags);
cond_resched();
} }
} }