Somewhere in the Radeon/DRM codebase, CMA page allocation has either regressed in the timeline of 4.5->4.9, and/or the drm/radeon code is doing something different with pages. Given that I haven't seen ANY other reports of this, I'm inclined to believe the problem is drm/radeon specific (if I don't start X, I can't reproduce the problem). The rate of the problem starts slow, and also is relatively low on an idle system (my screens blank at night, no xscreensaver running), but it still ramps up over time (to the point of generating 2.5GB/hour of "(timestamp) alloc_contig_range: [83e4d9, 83e4da) PFNs busy"), with various addresses (~100 unique ranges for a day). My X workload is ~50 chrome tabs and ~20 terminals (over 3x 24" monitors w/ 9 virtual desktops per monitor). I added a stack trace & rate limit to alloc_contig_range's PFNs busy message (patch in previous email on LKML/-MM lists); and they point to radeon. alloc_contig_range: [83f2a3, 83f2a4) PFNs busy CPU: 3 PID: 8518 Comm: X Not tainted 4.9.0-rc7-00024-g6ad4037e18ec #27 Hardware name: System manufacturer System Product Name/P8Z68 DELUXE, BIOS 0501 05/09/2011 ffffad50c3d7f730 ffffffffb236c873 000000000083f2a3 000000000083f2a4 ffffad50c3d7f810 ffffffffb2183b38 ffff999dff4d8040 0000000020fca8c0 000000000083f400 000000000083f000 000000000083f2a3 0000000000000004 Call Trace: [<ffffffffb236c873>] dump_stack+0x85/0xc2 [<ffffffffb2183b38>] alloc_contig_range+0x368/0x370 [<ffffffffb2202d37>] cma_alloc+0x127/0x2e0 [<ffffffffb24c4b28>] dma_alloc_from_contiguous+0x38/0x40 [<ffffffffb2020b01>] dma_generic_alloc_coherent+0x91/0x1d0 [<ffffffffb2049b75>] x86_swiotlb_alloc_coherent+0x25/0x50 [<ffffffffc0ef17da>] ttm_dma_populate+0x48a/0x9a0 [ttm] [<ffffffffb21df8d6>] ? __kmalloc+0x1b6/0x250 [<ffffffffc0f2a3ea>] radeon_ttm_tt_populate+0x22a/0x2d0 [radeon] [<ffffffffc0ee80f7>] ? ttm_dma_tt_init+0x67/0xc0 [ttm] [<ffffffffc0ee7cc7>] ttm_tt_bind+0x37/0x70 [ttm] [<ffffffffc0ee9e58>] ttm_bo_handle_move_mem+0x528/0x5a0 [ttm] [<ffffffffb219464a>] ? shmem_alloc_inode+0x1a/0x30 [<ffffffffc0eead24>] ttm_bo_validate+0x114/0x130 [ttm] [<ffffffffb269346e>] ? _raw_write_unlock+0xe/0x10 [<ffffffffc0eeb05d>] ttm_bo_init+0x31d/0x3f0 [ttm] [<ffffffffc0f2b7ab>] radeon_bo_create+0x19b/0x260 [radeon] [<ffffffffc0f2b2e0>] ? radeon_update_memory_usage.isra.0+0x50/0x50 [radeon] [<ffffffffc0f3e29d>] radeon_gem_object_create+0xad/0x180 [radeon] [<ffffffffc0f3e6ff>] radeon_gem_create_ioctl+0x5f/0xf0 [radeon] [<ffffffffc0e3a9eb>] drm_ioctl+0x21b/0x4d0 [drm] [<ffffffffc0f3e6a0>] ? radeon_gem_pwrite_ioctl+0x30/0x30 [radeon] [<ffffffffc0f0d04c>] radeon_drm_ioctl+0x4c/0x80 [radeon] [<ffffffffb221bae2>] do_vfs_ioctl+0x92/0x5c0 [<ffffffffb221c089>] SyS_ioctl+0x79/0x90 [<ffffffffb2002bf3>] do_syscall_64+0x73/0x190 [<ffffffffb26936c8>] entry_SYSCALL64_slow_path+0x25/0x25 The Radeon card in my case is a VisionTek HD 7750 Eyefinity 6, which is reported as: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [Radeon HD 7750/8740 / R7 250E] (prog-if 00 [VGA controller]) Subsystem: VISIONTEK Cape Verde PRO [Radeon HD 7750/8740 / R7 250E] Flags: bus master, fast devsel, latency 0, IRQ 58 Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at fbe00000 (64-bit, non-prefetchable) [size=256K] I/O ports at e000 [size=256] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Kernel driver in use: radeon Kernel modules: radeon, amdgpu -- Robin Hugh Johnson E-Mail : robbat2@xxxxxxxxxxxxxxxxxx Home Page : http://www.orbis-terrarum.net/?l=people.robbat2 ICQ# : 30269588 or 41961639 GnuPG FP : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85
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