Messages in this thread Patch in this message | | | Date | Mon, 28 Oct 2019 14:56:46 -0700 | Subject | [PATCH] dma-debug: add a schedule point in debug_dma_dump_mappings() | From | Eric Dumazet <> |
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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> --- kernel/dma/debug.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 099002d84f466af0a8e421d035ac8eb119e08bd8..4ad74f5987ea9e95f9bb5e2d1592254e367d24fb 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -420,6 +420,7 @@ void debug_dma_dump_mappings(struct device *dev) } spin_unlock_irqrestore(&bucket->lock, flags); + cond_resched(); } } -- 2.24.0.rc0.303.g954a862665-goog
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