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SubjectRe: 5.1 kernel: khugepaged stuck at 100%
On Tue, May 14, 2019 at 9:16 AM Kirill A. Shutemov <kirill@shutemov.name> wrote:

> Could you check what khugepaged doing?
>
> cat /proc/$(pidof khugepaged)/stack

It is doing it again, 10:12am - 2019-05-16

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
77 root 39 19 0 0 0 R 100.0 0.0 92:06.94 khugepaged

Kernel: 5.1.2

$ sudo cat /proc/$(pidof khugepaged)/stack
[<0>] 0xffffffffffffffff

$ perf top

PerfTop: 3716 irqs/sec kernel:92.9% exact: 99.1% lost: 68/68
drop: 0/0 [4000Hz cycles], (all, 12 CPUs)
-------------------------------------------------------------------------------

47.53% [kernel] [k] compaction_alloc
38.88% [kernel] [k] __pageblock_pfn_to_page
6.68% [kernel] [k] nmi
0.58% [kernel] [k] __list_del_entry_valid
0.48% [kernel] [k] format_decode
0.39% [kernel] [k] __rb_insert_augmented
0.25% libdbus-1.so.3.19.9 [.] _dbus_string_hex_decode
0.24% [kernel] [k] entry_SYSCALL_64_after_hwframe
0.20% perf [.] rb_next
0.19% perf [.] __symbols__insert

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