Re: DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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.
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux