perf top - here's a copy of the screen's first lines.
Samples: 1K of event 'cycles', Event count (approx.): 669342282
Overhead Shared Object Symbol
6,47% [kernel] [k] number.isra.2
6,18% [kernel] [k] format_decode
6,17% [kernel] [k] kallsyms_expand_symbol.constprop.1
5,00% [kernel] [k] vsnprintf
3,88% [kernel] [k] strnlen
2,88% [kernel] [k] string.isra.7
2,76% perf [.] 0x000000000005a0b7
2,41% libc-2.21.so [.] memchr
2,29% [kernel] [k] pointer.isra.19
1,88% libc-2.21.so [.] getdelim
1,70% perf [.] 0x0000000000061b9c
1,53% libc-2.21.so [.] 0x000000000014f054
1,35% libc-2.21.so [.] __libc_calloc
1,30% libc-2.21.so [.] 0x000000000014de22
1,24% libc-2.21.so [.] _IO_feof
1,19% [kernel] [k] apparmor_capable
0,94% [kernel] [k] seq_read
0,88% [kernel] [k] module_get_kallsym
0,82% [kernel] [k] s_show
0,77% perf [.] 0x0000000000063917
0,76% [kernel] [k] clear_page
0,71% [kernel] [k] update_iter
0,70% perf [.] 0x0000000000061bae
0,65% [kernel] [k] s_next
0,59% [kernel] [k] seq_vprintf
0,59% libc-2.21.so [.] strlen
0,53% [kernel] [k] copy_user_generic_unrolled
0,53% perf [.] 0x000000000009f873
0,41% libc-2.21.so [.] 0x000000000014f058
0,41% libc-2.21.so [.] 0x000000000008e179
0,41% libc-2.21.so [.] 0x000000000008e14a
0,41% perf [.] 0x0000000000063904
0,41% perf [.] 0x000000000009f899
0,41% perf [.] 0x000000000009f887
0,41% perf [.] 0x0000000000061bab
0,35% libc-2.21.so [.] 0x000000000008e182
0,35% perf [.] 0x000000000009f884
0,35% [kernel] [k] rw_verify_area
0,35% [kernel] [k] strlcpy
0,35% [kernel] [k] update_wall_time
0,35% [kernel] [k] memcpy
0,30% [kernel] [k] cap_capable
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https://bugs.launchpad.net/bugs/1472293
Title:
load >= 1 while idle for no obvious reason with ACPI
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