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