On Wed, Jan 23, 2013 at 04:30:53PM +0100, Soeren Moch wrote:
On 19.01.2013 19:59, Andrew Lunn wrote:
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.
AndrewNow I built a kernel with debugfs enabled. It is not clear to me what I can see from the dma-api/num_free_entries output. After reboot (vdr running) I see decreasing numbers (3453 3452 3445 3430...), min_free_entries is lower (3390). Sometimes the output is constant for several minutes ( 3396 3396 3396 3396 3396,...)
We are interesting in the long term behavior. Does it gradually go down? Or is it stable? If it goes down over time, its clearly a leak somewhere.
Andrew