> make it a module, and run "perf top" while in an other terminal you do
>
> while :; do modprobe acpi_battery ; rmmod acpi_battery ; done
----------------------------------------------------------------------
PerfTop: 747 irqs/sec kernel:94.5% exact: 0.0% [1000Hz cycles],
(all, 2 CPUs)
----------------------------------------------------------------------
samples pcnt function DSO
_______ _____ ___________________ _______________________
2502.00 28.4% intel_idle [kernel.kallsyms]
802.00 9.1% acpi_os_read_port [kernel.kallsyms]
735.00 8.4% read_hpet [kernel.kallsyms]
559.00 6.4% check_poison_obj [kernel.kallsyms]
286.00 3.3% acpi_ec_gpe_handler [kernel.kallsyms]
208.00 2.4% cache_free_debugche [kernel.kallsyms]
200.00 2.3% cache_alloc_debugch [kernel.kallsyms]
169.00 1.9% kmem_cache_alloc [kernel.kallsyms]
138.00 1.6% acpi_debug_print [kernel.kallsyms]
90.00 1.0% hpet_next_event [kernel.kallsyms]
88.00 1.0% kmem_cache_free [kernel.kallsyms]
83.00 0.9% acpi_os_write_port [kernel.kallsyms]
74.00 0.8% acpi_ps_parse_loop [kernel.kallsyms]
72.00 0.8% find_busiest_group [kernel.kallsyms]
72.00 0.8% schedule [kernel.kallsyms]
58.00 0.7% _raw_spin_lock_irqs [kernel.kallsyms]
58.00 0.7% acpi_ps_get_opcode_ [kernel.kallsyms]
56.00 0.6% advance_transaction [kernel.kallsyms]
54.00 0.6% menu_select [kernel.kallsyms]
52.00 0.6% __might_sleep [kernel.kallsyms]
47.00 0.5% ktime_get [kernel.kallsyms]
41.00 0.5% __virt_addr_valid [kernel.kallsyms]
38.00 0.4% start_transaction [kernel.kallsyms]
38.00 0.4% acpi_ec_transaction [kernel.kallsyms]
36.00 0.4% dbg_redzone2 [kernel.kallsyms]
36.00 0.4% _raw_spin_unlock_ir [kernel.kallsyms]
35.00 0.4% tick_nohz_stop_sche [kernel.kallsyms]
33.00 0.4% acpi_ps_complete_op [kernel.kallsyms]
32.00 0.4% sched_clock [kernel.kallsyms]
32.00 0.4% getnstimeofday [kernel.kallsyms]
32.00 0.4% __switch_to [kernel.kallsyms]
31.00 0.4% acpi_ds_exec_end_op [kernel.kallsyms]
31.00 0.4% ec_check_ibf0 [kernel.kallsyms]
31.00 0.4% irq_entries_start [kernel.kallsyms]
30.00 0.3% acpi_hw_read [kernel.kallsyms]
30.00 0.3% acpi_ev_gpe_detect [kernel.kallsyms]
29.00 0.3% acpi_ec_transaction [kernel.kallsyms]
28.00 0.3% acpi_ut_update_obje [kernel.kallsyms]
27.00 0.3% acpi_ut_update_ref_ [kernel.kallsyms]
26.00 0.3% acpi_hw_validate_io [kernel.kallsyms]
25.00 0.3% acpi_hw_read_port [kernel.kallsyms]
24.00 0.3% find_symbol_in_sect [kernel.kallsyms]
24.00 0.3% __GI___strcmp_ssse3 /lib64/libc-2.12.90.so
23.00 0.3% __phys_addr [kernel.kallsyms]
23.00 0.3% acpi_ex_resolve_ope [kernel.kallsyms]
21.00 0.2% select_task_rq_fair [kernel.kallsyms]
21.00 0.2% acpi_hw_validate_re [kernel.kallsyms]
21.00 0.2% enqueue_task_fair [kernel.kallsyms]
20.00 0.2% cpuidle_idle_call [kernel.kallsyms]
19.00 0.2% find_next_bit [kernel.kallsyms]
19.00 0.2% ns_to_timeval [kernel.kallsyms]
19.00 0.2% _raw_spin_lock [kernel.kallsyms]
19.00 0.2% acpi_ut_allocate_ob [kernel.kallsyms]
19.00 0.2% acpi_ut_create_gene [kernel.kallsyms]
19.00 0.2% g_hash_table_lookup libglib-2.0.so.0.2600.0
18.00 0.2% sched_clock_local [kernel.kallsyms]
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