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Kernel/Profiling: Add profiling to read syscall

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Syscalls to read can now be profiled, allowing us to monitor
filesystem usage by different applications.
This commit is contained in:
Jakub Berkop 2021-12-04 13:26:13 +01:00 • committed by Andreas Kling
parent bd821982e0
commit 4916c892b2
6 changed files with 86 additions and 9 deletions
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25
Kernel/PerformanceEventBuffer.cpp
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@ -22,7 +22,7 @@ PerformanceEventBuffer::PerformanceEventBuffer(NonnullOwnPtr<KBuffer> buffer)
{
}
NEVER_INLINE ErrorOr<void> PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2, StringView arg3, Thread* current_thread)
NEVER_INLINE ErrorOr<void> PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2, StringView arg3, Thread* current_thread, FlatPtr arg4, u64 arg5, ErrorOr<FlatPtr> arg6)
{
FlatPtr base_pointer;
#if ARCH(I386)
@ -32,7 +32,7 @@ NEVER_INLINE ErrorOr<void> PerformanceEventBuffer::append(int type, FlatPtr arg1
asm volatile("movq %%rbp, %%rax"
: "=a"(base_pointer));
#endif
return append_with_ip_and_bp(current_thread->pid(), current_thread->tid(), 0, base_pointer, type, 0, arg1, arg2, arg3);
return append_with_ip_and_bp(current_thread->pid(), current_thread->tid(), 0, base_pointer, type, 0, arg1, arg2, arg3, arg4, arg5, arg6);
}
static Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> raw_backtrace(FlatPtr bp, FlatPtr ip)
@ -73,13 +73,13 @@ static Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> raw_backtrace(Fl
}
ErrorOr<void> PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid, const RegisterState& regs,
int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, StringView arg3)
int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, StringView arg3, FlatPtr arg4, u64 arg5, ErrorOr<FlatPtr> arg6)
{
return append_with_ip_and_bp(pid, tid, regs.ip(), regs.bp(), type, lost_samples, arg1, arg2, arg3);
return append_with_ip_and_bp(pid, tid, regs.ip(), regs.bp(), type, lost_samples, arg1, arg2, arg3, arg4, arg5, arg6);
}
ErrorOr<void> PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, ThreadID tid,
FlatPtr ip, FlatPtr bp, int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, StringView arg3)
FlatPtr ip, FlatPtr bp, int type, u32 lost_samples, FlatPtr arg1, FlatPtr arg2, StringView arg3, FlatPtr arg4, u64 arg5, ErrorOr<FlatPtr> arg6)
{
if (count() >= capacity())
return ENOBUFS;
@ -165,6 +165,13 @@ ErrorOr<void> PerformanceEventBuffer::append_with_ip_and_bp(ProcessID pid, Threa
event.data.signpost.arg1 = arg1;
event.data.signpost.arg2 = arg2;
break;
case PERF_EVENT_READ:
event.data.read.fd = arg1;
event.data.read.size = arg2;
event.data.read.filename_index = arg4;
event.data.read.start_timestamp = arg5;
event.data.read.success = !arg6.is_error();
break;
default:
return EINVAL;
}
@ -278,6 +285,14 @@ ErrorOr<void> PerformanceEventBuffer::to_json_impl(Serializer& object) const
event_object.add("arg1"sv, event.data.signpost.arg1);
event_object.add("arg2"sv, event.data.signpost.arg2);
break;
case PERF_EVENT_READ:
event_object.add("type", "read");
event_object.add("fd", event.data.read.fd);
event_object.add("size"sv, event.data.read.size);
event_object.add("filename_index"sv, event.data.read.filename_index);
event_object.add("start_timestamp"sv, event.data.read.start_timestamp);
event_object.add("success"sv, event.data.read.success);
break;
}
event_object.add("pid", event.pid);
event_object.add("tid", event.tid);