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Kernel+lsirq: Track per-CPU IRQ handler call counts

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Each GenericInterruptHandler now tracks the number of calls that each
CPU has serviced.

This takes care of a FIXME in the /sys/kernel/interrupts generator.

Also, the lsirq command line tool now displays per-CPU call counts.
This commit is contained in:
Andreas Kling 2022-11-18 22:07:57 +01:00
parent 94b514b981
commit fb00d3ed25
4 changed files with 33 additions and 9 deletions
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22
Userland/Utilities/lsirq.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -20,17 +21,30 @@ ErrorOr<int> serenity_main(Main::Arguments)
TRY(Core::System::pledge("stdio"));
outln(" CPU0");
auto file_contents = proc_interrupts->read_all();
auto json = TRY(JsonValue::from_string(file_contents));
json.as_array().for_each([](auto& value) {
auto cpu_count = json.as_array().at(0).as_object().get("per_cpu_call_counts"sv).as_array().size();
out(" "sv);
for (size_t i = 0; i < cpu_count; ++i) {
out("{:>10}", String::formatted("CPU{}", i));
}
outln("");
json.as_array().for_each([cpu_count](JsonValue const& value) {
auto& handler = value.as_object();
auto purpose = handler.get("purpose"sv).to_string();
auto interrupt = handler.get("interrupt_line"sv).to_string();
auto controller = handler.get("controller"sv).to_string();
auto call_count = handler.get("call_count"sv).to_string();
auto call_counts = handler.get("per_cpu_call_counts"sv).as_array();
outln("{:>4}: {:10} {:10} {:30}", interrupt, call_count, controller, purpose);
out("{:>4}: ", interrupt);
for (size_t i = 0; i < cpu_count; ++i)
out("{:>10}", call_counts[i].to_string());
outln(" {:10} {:30}", controller, purpose);
});
return 0;