[trace][intelpt] Support system-wide tracing [5] - Disable/enable per-core tracing based on the process state

When tracing on per-core mode, we are tracing all processes, which means
that after hitting a breakpoint, our process will stop running (thus
producing no more tracing data) but other processes will continue
writing to our trace buffers. This causes a big data loss for our trace.
As a way to remediate this, I'm adding some logic to pause and unpause
tracing based on the target's state. The earlier we do it the better,
however, I'm not adding the trigger at the earliest possible point for
simplicity of this diff. Later we can improve that part.

Differential Revision: https://reviews.llvm.org/D124962

1 files changed, 5 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp b/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
index 37da1f1..a7869d2 100644
--- a/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
+++ b/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
@@ -1665,6 +1665,11 @@ void NativeProcessLinux::StopTrackingThread(NativeThreadLinux &thread) {
   SignalIfAllThreadsStopped();
 }
 
+void NativeProcessLinux::NotifyTracersProcessStateChanged(
+    lldb::StateType state) {
+  m_intel_pt_collector.OnProcessStateChanged(state);
+}
+
 Status NativeProcessLinux::NotifyTracersOfNewThread(lldb::tid_t tid) {
   Log *log = GetLog(POSIXLog::Thread);
   Status error(m_intel_pt_collector.OnThreadCreated(tid));