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Kernel: Generate page fault events from the kernel profiler

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Hook the kernel page fault handler and capture page fault events when
the fault has a current thread attached in TLS. We capture the eip and
ebp so we can unwind the stack and locate which pieces of code are
generating the most page faults.

Co-authored-by: Gunnar Beutner <gbeutner@serenityos.org>
This commit is contained in:
Brian Gianforcaro 2021-05-18 02:26:11 -07:00 • committed by Andreas Kling
parent 6ac1ca5a9a
commit 83fc591cea
7 changed files with 47 additions and 2 deletions
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4
Userland/Utilities/profile.cpp
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@ -44,6 +44,8 @@ int main(int argc, char** argv)
event_mask |= PERF_EVENT_KMALLOC;
else if (event_type == "kfree")
event_mask |= PERF_EVENT_KFREE;
else if (event_type == "page_fault")
event_mask |= PERF_EVENT_PAGE_FAULT;
else {
warnln("Unknown event type '{}' specified.", event_type);
exit(1);
@ -53,7 +55,7 @@ int main(int argc, char** argv)
auto print_types = [] {
outln();
outln("Event type can be one of: sample, context_switch, kmalloc and kfree.");
outln("Event type can be one of: sample, context_switch, page_fault, kmalloc and kfree.");
};
if (!args_parser.parse(argc, argv, false)) {