On 15/08/2019 14:35, Christoph Hellwig wrote:
On Wed, Aug 14, 2019 at 07:49:27PM +0200, Daniel Vetter wrote:
On Wed, Aug 14, 2019 at 04:50:33PM +0200, Corentin Labbe wrote:
Hello
Since lot of release (at least since 4.19), I hit the following error message:
DMA-API: cacheline tracking ENOMEM, dma-debug disabled
After hitting that, I try to check who is creating so many DMA mapping and see:
cat /sys/kernel/debug/dma-api/dump | cut -d' ' -f2 | sort | uniq -c
6 ahci
257 e1000e
6 ehci-pci
5891 nouveau
24 uhci_hcd
Does nouveau having this high number of DMA mapping is normal ?
Yeah seems perfectly fine for a gpu.
That is a lot and apparently overwhelm the dma-debug tracking. Robin
rewrote this code in Linux 4.21 to work a little better, so I'm curious
why this might have changes in 4.19, as dma-debug did not change at
all there.
FWIW, the cacheline tracking entries are a separate thing from the
dma-debug entries that I rejigged - judging by those numbers there
should still be plenty of free dma-debug entries, but for some reason it
has failed to extend the radix tree :/
Robin.
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