| From ee27a3bca48b093a1012e9d4d3bc5cf0da43364b Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 28 Oct 2019 14:56:46 -0700 |
| Subject: dma-debug: add a schedule point in debug_dma_dump_mappings() |
| |
| From: Eric Dumazet <edumazet@google.com> |
| |
| [ Upstream commit 9ff6aa027dbb98755f0265695354f2dd07c0d1ce ] |
| |
| 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> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| kernel/dma/debug.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c |
| index c007d25bee09..3a2397444076 100644 |
| --- a/kernel/dma/debug.c |
| +++ b/kernel/dma/debug.c |
| @@ -442,6 +442,7 @@ void debug_dma_dump_mappings(struct device *dev) |
| } |
| |
| spin_unlock_irqrestore(&bucket->lock, flags); |
| + cond_resched(); |
| } |
| } |
| |
| -- |
| 2.20.1 |
| |