Hello all, Here is a patch set that adds /proc/cmainfo. When compiled with CONFIG_CMA_DEBUG /proc/cmainfo will contain information about about total, used, maximum free contiguous chunk and all currently allocated contiguous buffers in CMA regions. The information about allocated CMA buffers includes pid, comm, allocation latency and stacktrace at the moment of allocation. Example: # cat /proc/cmainfo CMARegion stat: 65536 kB total, 248 kB used, 65216 kB max contiguous chunk 0x32400000 - 0x32401000 (4 kB), allocated by pid 63 (systemd-udevd), latency 74 us [<c1006e96>] dma_generic_alloc_coherent+0x86/0x160 [<c13093af>] rpm_idle+0x1f/0x1f0 [<c1006e10>] dma_generic_alloc_coherent+0x0/0x160 [<f80a533e>] ohci_init+0x1fe/0x430 [ohci_hcd] [<c1006e10>] dma_generic_alloc_coherent+0x0/0x160 [<f801404f>] ohci_pci_reset+0x4f/0x60 [ohci_pci] [<f80f165c>] usb_add_hcd+0x1fc/0x900 [usbcore] [<c1256158>] pcibios_set_master+0x38/0x90 [<f8101ea6>] usb_hcd_pci_probe+0x176/0x4f0 [usbcore] [<c125852f>] pci_device_probe+0x6f/0xd0 [<c1199495>] sysfs_create_link+0x25/0x50 [<c1300522>] driver_probe_device+0x92/0x3b0 [<c14564fb>] __mutex_lock_slowpath+0x5b/0x90 [<c1300880>] __driver_attach+0x0/0x80 [<c13008f9>] __driver_attach+0x79/0x80 [<c1300880>] __driver_attach+0x0/0x80 0x32401000 - 0x32402000 (4 kB), allocated by pid 58 (systemd-udevd), latency 17 us [<c130e370>] dmam_coherent_release+0x0/0x90 [<c112d76c>] __kmalloc_track_caller+0x31c/0x380 [<c1006e96>] dma_generic_alloc_coherent+0x86/0x160 [<c1006e10>] dma_generic_alloc_coherent+0x0/0x160 [<c130e226>] dmam_alloc_coherent+0xb6/0x100 [<f8125153>] ata_bmdma_port_start+0x43/0x60 [libata] [<f8113068>] ata_host_start.part.29+0xb8/0x190 [libata] [<c13624a0>] pci_read+0x30/0x40 [<f8124eb9>] ata_pci_sff_activate_host+0x29/0x220 [libata] [<f8127050>] ata_bmdma_interrupt+0x0/0x1f0 [libata] [<c1256158>] pcibios_set_master+0x38/0x90 [<f80ad9be>] piix_init_one+0x44e/0x630 [ata_piix] [<c1455ef0>] mutex_lock+0x10/0x20 [<c1197093>] kernfs_activate+0x63/0xd0 [<c11971c3>] kernfs_add_one+0xc3/0x130 [<c125852f>] pci_device_probe+0x6f/0xd0 <...> Dmitry Safonov (1): cma: add functions to get region pages counters Stefan I. Strogin (2): stacktrace: add seq_print_stack_trace() mm: cma: introduce /proc/cmainfo include/linux/cma.h | 2 + include/linux/stacktrace.h | 4 + kernel/stacktrace.c | 17 ++++ mm/cma.c | 236 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 259 insertions(+) -- 2.1.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>