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Kernel: Add syscall performance event type
This allows tracing the syscalls made by a thread through the kernel's performance event framework, which is similar in principle to strace. Currently, this merely logs a stack backtrace to the current thread's performance event buffer whenever a syscall is made, if profiling is enabled. Future improvements could include tracing the arguments and the return value, for example.
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4c4b8ea443
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6 changed files with 24 additions and 1 deletions
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@ -45,6 +45,8 @@ int main(int argc, char** argv)
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event_mask |= PERF_EVENT_KFREE;
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else if (event_type == "page_fault")
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event_mask |= PERF_EVENT_PAGE_FAULT;
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else if (event_type == "syscall")
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event_mask |= PERF_EVENT_SYSCALL;
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else {
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warnln("Unknown event type '{}' specified.", event_type);
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exit(1);
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@ -54,7 +56,7 @@ int main(int argc, char** argv)
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auto print_types = [] {
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outln();
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outln("Event type can be one of: sample, context_switch, page_fault, kmalloc and kfree.");
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outln("Event type can be one of: sample, context_switch, page_fault, syscall, kmalloc and kfree.");
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};
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if (!args_parser.parse(argc, argv, Core::ArgsParser::FailureBehavior::PrintUsage)) {
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