https://bugzilla.kernel.org/show_bug.cgi?id=215419
--- Comment #2 from Paul Menzel (pmenzel+bugzilla.kernel....@molgen.mpg.de) ---
Using ftrace
[ 0.000000] Linux version 5.15.0-2-amd64
(debian-ker...@lists.debian.org) (gcc-11 (Debian 11.2.0-13) 11.2.0, GNU ld (GNU
Binutils for Debian) 2.37) #1 SMP Debian 5.15.5-2 (2021-12-18)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.15.0-2-amd64
root=UUID=e17cec4f-d2b8-4cc3-bd39-39a10ed422f4 ro quiet noisapnp
cryptomgr.notests random.trust_cpu=on log_buf_len=32M trace_buf_size=146454K
trace_clock=global
trace_options=nooverwrite,funcgraph-abstime,funcgraph-cpu,funcgraph-duration,funcgraph-proc,funcgraph-tail,nofuncgraph-overhead,context-info,graph-time
ftrace=function_graph ftrace_graph_max_depth=7
ftrace_graph_filter=acpi_bus_scan
[…]
[ 0.786455] ACPI: Enabled 15 GPEs in block 00 to 3F
[ 0.982583] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[…]
it shows, that `acpi_pci_root_create()` takes 82 ms. The 200 ms delay instead
of 100 ms are due to tracing.
0.982641 | 0) swapper-1 | |
pci_acpi_scan_root() {
0.982641 | 0) swapper-1 | + 17.904 us |
acpi_get_node();
0.982660 | 0) swapper-1 | 0.391 us |
x86_pci_root_bus_node();
0.982661 | 0) swapper-1 | 1.038 us |
pci_find_bus();
0.982662 | 0) swapper-1 | 0.867 us |
kmem_cache_alloc_trace();
0.982663 | 0) swapper-1 | * 82014.31 us |
acpi_pci_root_create();
1.064681 | 0) swapper-1 | 1.203 us |
pcie_bus_configure_settings();
1.064682 | 0) swapper-1 | 0.837 us |
pcie_bus_configure_settings();
1.064683 | 0) swapper-1 | 0.857 us |
pcie_bus_configure_settings();
1.064684 | 0) swapper-1 | 0.301 us |
pcie_bus_configure_settings();
1.064685 | 0) swapper-1 | * 82044.38 us | } /*
pci_acpi_scan_root */
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