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authorEric Dumazet <edumazet@google.com>2019-10-28 14:56:46 -0700
committerChristoph Hellwig <hch@lst.de>2019-10-30 11:09:35 -0700
commit9ff6aa027dbb98755f0265695354f2dd07c0d1ce (patch)
treed6bb4e4288065583d14c1f16aaaeb4943c35e492 /kernel/dma/debug.c
parent4544b9f25e70eae9f70a243de0cc802aa5c8cb69 (diff)
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>
Diffstat (limited to 'kernel/dma/debug.c')
-rw-r--r--kernel/dma/debug.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 099002d84f46..4ad74f5987ea 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();
}
}