Hi Hirofumi, On Wednesday 10 October 2007, Hirofumi Momose wrote: > Hello, > > I am making custom webcam app. > It works good at first, but fails over time. It invoked by cron, so no > user memory leakage. > When fails, messages are : > > webcam: page allocation failure. order:5, mode:0x0 [snip] > Mem-info: > DMA per-cpu: > CPU 0: Hot: hi: 42, btch: 7 usd: 5 Cold: hi: 14, btch: 3 > usd: 13 Active:5931 inactive:22401 dirty:158 writeback:0 unstable:0 > free:1021 slab:1351 mapped:1075 pagetables:70 bounce:0 > DMA free:4084kB min:1440kB low:1800kB high:2160kB active:23724kB > inactive:89604kB present:13 able > > lowmem_reserve[]: 0 0 > DMA: 467*4kB 85*8kB 28*16kB 8*32kB 11*64kB 1*128kB 0*256kB 0*512kB 0*1024kB > 0*2048kB 0*4096k = 4084kB > Swap cache: add 0, delete 0, find 0/0, race 0+0 > > I think this might be caused by page fragmentation.
Looks like it :-/ The problems you report on this mailing list have all been interesting so far, but next time please try to report something trivial, that will be less work for me :-) > Small number of large pages are separated into large number of small > parts as time passed. And cause allocation failure. > > Does someone have any idea ? For high-bandwidth isochronous streaming the driver allocates URB buffers that can grow to 120kB. If this puts too much pressure on your system memory, try to decrease UVC_MAX_ISO_PACKETS in uvcvideo.h. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
