Hi Hans, On Mon, Jul 2, 2012 at 1:19 PM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: > On Mon 2 July 2012 09:25:08 Prabhakar Lad wrote: >> Hi, >> >> Recently when I updated my driver to 3.5 from 3.3, I am observing that >> my driver is failing for dma_alloc_coherent, >> when I traced it, I see lots of changes for MM in 3.5 release any >> Ideas why this could be happening? >> Here is the case my driver works fine for 7 runs of the application >> for 8th time it crashes for MMAP buffers below is >> the crash log. > > Hi Prabhakar, > > I've got to ask the obvious question: have you checked that the memory > allocated in the first 7 runs is also freed? In other words, aren't you > just running out of memory? > Yes Of course, I tested the same application on 3.3 and it works fine. Yes I am running out of memory. > The other option is memory fragmentation, making it impossible to allocate > the contiguous memory that you need. I actually suspect that this is the > reason for you running out of memory (it's not a crash, it's just telling > you that it can't allocate the memory you need). > Yes its soft crash. > The only correct way to solve this problem is to use CMA. As far as I can > tell you can just configure the amount of CMA memory as a config option or as > a kernel parameter (see Documentation/kernel-parameters.txt, search for > cma). That should ensure that the amount of memory you need is always available > for the buffers. I tried with cma=60M and its still the same case :( a soft crash. Thx, --Prabhakar Lad > > Regards, > > Hans > >> >> Thx, >> --Prabhakar Lad >> >> vpif_mmap_loopb: page allocation failure: order:10, mode:0xd0 >> Backtrace: >> [<c000c608>] (dump_backtrace+0x0/0x114) from [<c033cfc0>] (dump_stack+0x18/0x1c) >> r6:00000000 r5:000000d0 r4:00000001 r3:c048a060 >> [<c033cfa8>] (dump_stack+0x0/0x1c) from [<c0061c00>] >> (warn_alloc_failed+0xf4/0x118) >> [<c0061b0c>] (warn_alloc_failed+0x0/0x118) from [<c00627f4>] >> (__alloc_pages_nodemask+0x544/0x590) >> r3:c2cfbb64 r2:00000000 >> r7:c04b2f94 r6:c2cfa000 r5:0000000a r4:000000d0 >> [<c00622b0>] (__alloc_pages_nodemask+0x0/0x590) from [<c000e084>] >> (arm_dma_alloc+0x138/0x358) >> [<c000df4c>] (arm_dma_alloc+0x0/0x358) from [<c024ca94>] >> (vb2_dma_contig_alloc+0x78/0xfc) >> [<c024ca1c>] (vb2_dma_contig_alloc+0x0/0xfc) from [<c024a6cc>] >> (__vb2_queue_alloc+0xd4/0x338) >> r6:c36d5400 r5:00000000 r4:c361a190 >> [<c024a5f8>] (__vb2_queue_alloc+0x0/0x338) from [<c024adfc>] >> (vb2_reqbufs+0x22c/0x308) >> [<c024abd0>] (vb2_reqbufs+0x0/0x308) from [<c025399c>] >> (vpif_reqbufs+0x114/0x148) >> r7:00000001 r6:c2cfbe20 r5:c361a000 r4:c2d09400 >> [<c0253888>] (vpif_reqbufs+0x0/0x148) from [<c023a470>] >> (__video_do_ioctl+0x1a14/0x4914) >> r8:c0145608 r7:c03601e8 r6:00000000 r5:c3563000 r4:c2cfbe20 >> r3:00000000 >> [<c0238a5c>] (__video_do_ioctl+0x0/0x4914) from [<c0238890>] >> (video_usercopy+0x368/0x4b4) >> [<c0238528>] (video_usercopy+0x0/0x4b4) from [<c02389f0>] >> (video_ioctl2+0x14/0x1c) >> [<c02389dc>] (video_ioctl2+0x0/0x1c) from [<c02367e8>] (v4l2_ioctl+0xac/0x158) >> [<c023673c>] (v4l2_ioctl+0x0/0x158) from [<c009e67c>] (vfs_ioctl+0x28/0x40) >> r8:c00095a4 r7:00000003 r6:c37992b0 r5:c2c77e80 r4:bed27a24 >> r3:c023673c >> [<c009e654>] (vfs_ioctl+0x0/0x40) from [<c009edd8>] (do_vfs_ioctl+0x52c/0x588) >> [<c009e8ac>] (do_vfs_ioctl+0x0/0x588) from [<c009ee74>] (sys_ioctl+0x40/0x64) >> r9:c2cfa000 r8:c00095a4 r7:00000003 r6:c0145608 r5:bed27a24 >> r4:c2c77e80 >> [<c009ee34>] (sys_ioctl+0x0/0x64) from [<c0009420>] (ret_fast_syscall+0x0/0x2c) >> r7:00000036 r6:00008710 r5:00000000 r4:0000b308 >> Mem-info: >> DMA per-cpu: >> CPU 0: hi: 18, btch: 3 usd: 3 >> active_anon:315 inactive_anon:18 isolated_anon:0 >> active_file:3 inactive_file:112 isolated_file:0 >> unevictable:0 dirty:0 writeback:0 unstable:0 >> free:12196 slab_reclaimable:236 slab_unreclaimable:569 >> mapped:31 shmem:22 pagetables:34 bounce:0 >> DMA free:48712kB min:984kB low:1228kB high:1476kB active_anon:1260kB >> inactive_anon:72kB active_file:12kB inactive_file:560kB >> unevictable:0kB isolated(anon):0kB isolated(file):0kB present:609o >> lowmem_reserve[]: 0 0 0 >> DMA: 69*4kB 108*8kB 115*16kB 53*32kB 44*64kB 19*128kB 13*256kB 9*512kB >> 8*1024kB 11*2048kB 0*4096kB = 48580kB >> 217 total pagecache pages >> 0 pages in swap cache >> Swap cache stats: add 0, delete 0, find 0/0 >> Free swap = 0kB >> Total swap = 0kB >> 15360 pages of RAM >> 12199 free pages >> 1335 reserved pages >> 669 slab pages >> 155 pages shared >> 0 pages swap cached >> vpif_capture vpif_capture: dma_alloc_coherent of size 2622464 failed >> cannot allocate memory >> : Cannot allocate memory >> -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
