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Kernel+LibC: Add PERF_EVENT_SIGNPOST

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This event will be used by userspace programs wanting to mark
interesting high-level events in the profile. :^)
This commit is contained in:
Andreas Kling 2021-08-11 20:04:03 +02:00
parent 84053816d5
commit 0d997d48ea
4 changed files with 17 additions and 0 deletions
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9
Kernel/PerformanceEventBuffer.cpp
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@ -137,6 +137,10 @@ KResult PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID ti
break;
case PERF_EVENT_SYSCALL:
break;
case PERF_EVENT_SIGNPOST:
event.data.signpost.arg1 = arg1;
event.data.signpost.arg2 = arg2;
break;
default:
return EINVAL;
}
@ -231,6 +235,11 @@ bool PerformanceEventBuffer::to_json_impl(Serializer& object) const
case PERF_EVENT_SYSCALL:
event_object.add("type", "syscall");
break;
case PERF_EVENT_SIGNPOST:
event_object.add("type"sv, "signpost"sv);
event_object.add("arg1"sv, event.data.signpost.arg1);
event_object.add("arg2"sv, event.data.signpost.arg2);
break;
}
event_object.add("pid", event.pid);
event_object.add("tid", event.tid);

6
Kernel/PerformanceEventBuffer.h
View file

@ -62,6 +62,11 @@ struct [[gnu::packed]] KFreePerformanceEvent {
FlatPtr ptr;
};
struct [[gnu::packed]] SignpostPerformanceEvent {
FlatPtr arg1;
FlatPtr arg2;
};
struct [[gnu::packed]] PerformanceEvent {
u16 type { 0 };
u8 stack_size { 0 };
@ -80,6 +85,7 @@ struct [[gnu::packed]] PerformanceEvent {
ContextSwitchPerformanceEvent context_switch;
KMallocPerformanceEvent kmalloc;
KFreePerformanceEvent kfree;
SignpostPerformanceEvent signpost;
} data;
static constexpr size_t max_stack_frame_count = 64;
FlatPtr stack[max_stack_frame_count];

1
Kernel/UnixTypes.h
View file

@ -63,6 +63,7 @@ enum {
PERF_EVENT_KFREE = 4096,
PERF_EVENT_PAGE_FAULT = 8192,
PERF_EVENT_SYSCALL = 16384,
PERF_EVENT_SIGNPOST = 32768,
};
#define WNOHANG 1

1
Userland/Libraries/LibC/serenity.h
View file

@ -113,6 +113,7 @@ enum {
PERF_EVENT_KFREE = 4096,
PERF_EVENT_PAGE_FAULT = 8192,
PERF_EVENT_SYSCALL = 16384,
PERF_EVENT_SIGNPOST = 32768,
};
#define PERF_EVENT_MASK_ALL (~0ull)