https://bugzilla.kernel.org/show_bug.cgi?id=215419
--- Comment #6 from Paul Menzel (pmenzel+bugzilla.kernel....@molgen.mpg.de) ---
I also traced Linux 5.10.46, and interestingly the 100 ms then also started to
show up.
Trace of `acpi_bus_scan()` with maximum depth of 7(?):
```
0.778182 | 1) swapper-1 | | acpi_bus_scan() {
0.778184 | 1) swapper-1 | | acpi_bus_check_add() {
[…]
0.778541 | 1) swapper-1 | ! 357.324 us | } /* acpi_bus_check_add
*/
0.778542 | 1) swapper-1 | | acpi_walk_namespace() {
[…]
0.869146 | 1) swapper-1 | * 90601.57 us | } /*
acpi_walk_namespace */
0.869146 | 1) swapper-1 | | acpi_bus_attach() {
[…]
0.949104 | 1) swapper-1 | |
acpi_bus_attach() {
0.949104 | 1) swapper-1 | 3.343 us |
acpi_bus_get_ejd();
0.949108 | 1) swapper-1 | @ 107439.9 us |
acpi_bus_get_status();
1.056551 | 1) swapper-1 | 4.586 us |
acpi_scan_match_handler();
1.056556 | 1) swapper-1 | 3.143 us |
device_attach();
1.056559 | 1) swapper-1 | ! 123.417 us |
acpi_create_platform_device();
1.056683 | 1) swapper-1 | @ 107577.3 us | } /*
acpi_bus_attach */
[…]
1.064413 | 1) swapper-1 | @ 195263.3 us | } /* acpi_bus_attach */
1.064413 | 1) swapper-1 | @ 286227.2 us | } /* acpi_bus_scan */
```
Trace of `acpi_bus_scan()` with maximum depth of 2:
```
0.777785 | 1) swapper-1 | | acpi_bus_scan() {
0.777787 | 1) swapper-1 | | acpi_bus_check_add() {
0.777788 | 1) swapper-1 | 1.790 us | acpi_get_data_full();
0.777790 | 1) swapper-1 | 0.316 us | acpi_get_type();
0.777791 | 1) swapper-1 | ! 171.688 us |
acpi_add_single_object();
0.777963 | 1) swapper-1 | 6.276 us | acpi_has_method();
0.777970 | 1) swapper-1 | 5.594 us | acpi_has_method();
0.777976 | 1) swapper-1 | 5.654 us | acpi_bay_match();
0.777982 | 1) swapper-1 | 5.784 us |
acpi_scan_match_handler();
0.777988 | 1) swapper-1 | 6.351 us |
acpi_device_dep_initialize();
0.777994 | 1) swapper-1 | ! 207.142 us | } /* acpi_bus_check_add
*/
0.777995 | 1) swapper-1 | | acpi_walk_namespace() {
0.777995 | 1) swapper-1 | 1.299 us |
acpi_ut_acquire_read_lock();
0.777997 | 1) swapper-1 | 0.632 us |
acpi_ut_acquire_mutex();
0.777998 | 1) swapper-1 | 0.295 us |
acpi_ns_validate_handle();
0.777998 | 1) swapper-1 | * 47792.60 us |
acpi_ns_walk_namespace();
0.825799 | 1) swapper-1 | 1.048 us |
acpi_ut_release_mutex();
0.825800 | 1) swapper-1 | 1.373 us |
acpi_ut_release_read_lock();
0.825801 | 1) swapper-1 | * 47803.62 us | } /*
acpi_walk_namespace */
0.825802 | 1) swapper-1 | | acpi_bus_attach() {
0.825802 | 1) swapper-1 | 6.501 us | acpi_bus_get_ejd();
0.825809 | 1) swapper-1 | 8.632 us |
acpi_bus_get_status();
0.825818 | 1) swapper-1 | 3.143 us |
acpi_scan_match_handler();
0.825821 | 1) swapper-1 | 1.634 us | device_attach();
0.825823 | 1) swapper-1 | + 44.135 us | acpi_bus_attach();
0.825868 | 1) swapper-1 | + 50.461 us | acpi_bus_attach();
0.825919 | 1) swapper-1 | + 27.354 us | acpi_bus_attach();
0.825947 | 1) swapper-1 | + 36.491 us | acpi_bus_attach();
0.825983 | 1) swapper-1 | @ 201902.8 us | acpi_bus_attach();
1.027891 | 1) swapper-1 | + 29.303 us | acpi_bus_attach();
1.027920 | 1) swapper-1 | @ 202117.8 us | } /* acpi_bus_attach */
1.027921 | 1) swapper-1 | @ 250133.4 us | } /* acpi_bus_scan */
```
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