[PATCH 0/3] mm: cma: /proc/cmainfo

["Stefan I. Strogin" <s.strogin@partner.samsung.com>]

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

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