Commit 9ff6aa02 authored Oct 28, 2019 by Eric Dumazet Committed by Christoph Hellwig Oct 30, 2019

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>

parent 4544b9f2

kernel/dma/debug.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -420,6 +420,7 @@ void debug_dma_dump_mappings(struct device *dev)
		}

		spin_unlock_irqrestore(&bucket->lock, flags);
		cond_resched();
		}
		}

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