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SubjectRe: Possible dcache BUG
On Thu, 12 Aug 2004 18:31:31 -0700 (PDT) Linus Torvalds (LT) wrote:

LT> Your slab usage seems to be:
LT>
LT> cumulative usage name
LT> ========= ====== ====
LT> .....
LT> 4,994,684 499,712 size-8192
LT> 5,912,188 917,504 size-32768
LT> 105,397,820 99,485,632 size-64
LT>
LT> Something pretty much stands out.
LT>
LT> What the _heck_ is doing 64-byte allocations and leaking them?

I think the offender is ACPI. I've been logging 64-byte slab allocations
for a while now and this is what I came up with:

The most frequent user of 64-byte allocations is:

[<c013e98f>] __kmalloc+0x6f/0x80
[<c016649e>] sys_poll+0xbe/0x230
[<c0165201>] sys_ioctl+0x101/0x2a0
[<c0165940>] __pollwait+0x0/0xc0
[<c011f00c>] sys_gettimeofday+0x2c/0x70
[<c01040db>] syscall_call+0x7/0xb

But that doesn't seem to leak, because I've had these happen for days before
things started getting bad.

However, then as slab usage went skyrocket after 3 days, I started logging
these:

[<c013e98f>] __kmalloc+0x6f/0x80
[<c0217af9>] acpi_os_allocate+0xa/0xb
[<c022b9b6>] acpi_ut_callocate+0x30/0x7a
[<c022b840>] acpi_ut_acquire_from_cache+0x9d/0xaa
[<c022c7d8>] acpi_ut_create_generic_state+0xa/0x12
[<c021b0b2>] acpi_ds_result_stack_push+0x8/0x25
[<c021b268>] acpi_ds_create_walk_state+0x53/0x70
[<c0227913>] acpi_ps_delete_parse_tree+0x20/0x89
[<c0227238>] acpi_ps_parse_loop+0x550/0x7bb
[<c02274f0>] acpi_ps_parse_aml+0x4d/0x1a1
[<c0219dd4>] acpi_ds_call_control_method+0xd3/0x1b3
[<c0227505>] acpi_ps_parse_aml+0x62/0x1a1
[<c0227d1f>] acpi_psx_execute+0x13b/0x194
[<c0225212>] acpi_ns_execute_control_method+0x3b/0x47
[<c02251c0>] acpi_ns_evaluate_by_handle+0x6f/0x86
[<c02250cd>] acpi_ns_evaluate_relative+0xa9/0xc3
[<c02249c3>] acpi_evaluate_object+0xf3/0x1a0
[<c0160f56>] link_path_walk+0xbe6/0xe70
[<c022f496>] acpi_battery_get_status+0x68/0x102
[<c022f9b6>] acpi_battery_read_state+0x88/0x275
[<c018124b>] proc_file_read+0xbb/0x250
[<c0152ea1>] vfs_read+0xd1/0x130
[<c0153171>] sys_read+0x41/0x70
[<c01040db>] syscall_call+0x7/0xb

[<c013e98f>] __kmalloc+0x6f/0x80
[<c0217af9>] acpi_os_allocate+0xa/0xb
[<c022b9b6>] acpi_ut_callocate+0x30/0x7a
[<c022b840>] acpi_ut_acquire_from_cache+0x9d/0xaa
[<c022c7d8>] acpi_ut_create_generic_state+0xa/0x12
[<c0227a31>] acpi_ps_push_scope+0xf/0x57
[<c0227180>] acpi_ps_parse_loop+0x498/0x7bb
[<c02274f0>] acpi_ps_parse_aml+0x4d/0x1a1
[<c0227d1f>] acpi_psx_execute+0x13b/0x194
[<c0225212>] acpi_ns_execute_control_method+0x3b/0x47
[<c02251c0>] acpi_ns_evaluate_by_handle+0x6f/0x86
[<c02250cd>] acpi_ns_evaluate_relative+0xa9/0xc3
[<c02249c3>] acpi_evaluate_object+0xf3/0x1a0
[<c022370f>] acpi_hw_low_level_read+0x56/0x94
[<c0230949>] acpi_ec_gpe_query+0xd5/0xec
[<c0218098>] acpi_os_execute_deferred+0xc/0x16
[<c012a43e>] worker_thread+0x1ae/0x270
[<c021808c>] acpi_os_execute_deferred+0x0/0x16
[<c0117d70>] default_wake_function+0x0/0x10
[<c0117db7>] __wake_up_common+0x37/0x70
[<c0117d70>] default_wake_function+0x0/0x10
[<c012a290>] worker_thread+0x0/0x270
[<c012e266>] kthread+0x96/0xe0
[<c012e1d0>] kthread+0x0/0xe0
[<c010229d>] kernel_thread_helper+0x5/0x18

[<c013e98f>] __kmalloc+0x6f/0x80
[<c0217af9>] acpi_os_allocate+0xa/0xb
[<c022b9b6>] acpi_ut_callocate+0x30/0x7a
[<c022b840>] acpi_ut_acquire_from_cache+0x9d/0xaa
[<c022c7d8>] acpi_ut_create_generic_state+0xa/0x12
[<c0227a31>] acpi_ps_push_scope+0xf/0x57
[<c0227180>] acpi_ps_parse_loop+0x498/0x7bb
[<c02274f0>] acpi_ps_parse_aml+0x4d/0x1a1
[<c0219dd4>] acpi_ds_call_control_method+0xd3/0x1b3
[<c0227505>] acpi_ps_parse_aml+0x62/0x1a1
[<c0227d1f>] acpi_psx_execute+0x13b/0x194
[<c0225212>] acpi_ns_execute_control_method+0x3b/0x47
[<c02251c0>] acpi_ns_evaluate_by_handle+0x6f/0x86
[<c02250cd>] acpi_ns_evaluate_relative+0xa9/0xc3
[<c02249c3>] acpi_evaluate_object+0xf3/0x1a0
[<c02185ff>] acpi_evaluate_integer+0x2d/0x4b
[<c0146a17>] do_mmap_pgoff+0x537/0x710
[<c0234048>] acpi_thermal_get_temperature+0x24/0x31
[<c0234808>] acpi_thermal_temp_seq_show+0x12/0x4d
[<c017125e>] seq_read+0xbe/0x280
[<c0152ea1>] vfs_read+0xd1/0x130
[<c0153171>] sys_read+0x41/0x70
[<c01040db>] syscall_call+0x7/0xb

The machine is now allocating 64-byte slabs at about 20 objects per second.
I'm currently running 2.6.9-rc1-bk12 here.

-Udo.
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