diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-10-28 14:56:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-04 19:16:57 +0100 |
| commit | 34205ed59e98a3ce6bab5b2085dcb33c8c0ca98e (patch) | |
| tree | 4cf2bbf290f7cf753a0499adb2fc6994c741a4c7 /kernel | |
| parent | d26bf75e06f72bea4f7cbaed2170cb9b9e0b7c2e (diff) | |
dma-debug: add a schedule point in debug_dma_dump_mappings()
[ 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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/debug.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 099002d84f466..4ad74f5987ea9 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(); } } |