Re: [PATCH v2] mm: dmapool: use provided gfp flags for all dma_alloc_coherent() calls

Andrew Lunn
2013-01-19T19:01:15Z

> Please find attached a debug log generated with your patch.
>
> I used the sata disk and two em28xx dvb sticks, no other usb devices,
> no ethernet cable connected, tuners on saa716x-based card not used.
>
> What I can see in the log: a lot of coherent mappings from sata_mv
> and orion_ehci, a few from mv643xx_eth, no other coherent mappings.
> All coherent mappings are page aligned, some of them (from orion_ehci)
> are not really small (as claimed in __alloc_from_pool).
>
> I don't believe in a memory leak. When I restart vdr (the application
> utilizing the dvb sticks) then there is enough dma memory available
> again.

Hi Soeren

We should be able to rule out a leak. Mount debugfg and then:

while [ /bin/true ] ; do cat /debug/dma-api/num_free_entries ; sleep 60 ; done

while you are capturing. See if the number goes down.

Andrew