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| author | Eric Dumazet <edumazet@google.com> | 2019-10-29 00:56:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-04 15:40:44 +0300 |
| commit | bbed8ffa4164ec9a85de6e45e0b9ce553c7d098c (patch) | |
| tree | 383ecef4d95949a95398910a91ba5ff70913eda7 /lib | |
| parent | 441258ca6916dc80ff0c7edfbb7262fce3cd979a (diff) | |
| download | linux-bbed8ffa4164ec9a85de6e45e0b9ce553c7d098c.tar.xz | |
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 'lib')
| -rw-r--r-- | lib/dma-debug.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 8971370bfb16..4435bec55fb5 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -435,6 +435,7 @@ void debug_dma_dump_mappings(struct device *dev) } spin_unlock_irqrestore(&bucket->lock, flags); + cond_resched(); } } EXPORT_SYMBOL(debug_dma_dump_mappings); |