Profiler: Let the user ignore context switches

Now that the profiling timer is independent from the scheduler the
user will get quite a few CPU samples from "within" the scheduler.
These events are less useful when just profiling a user-mode process
rather than the whole system. This patch adds an option to Profiler to
hide these events.

1 files changed, 15 insertions, 0 deletions

diff --git a/Userland/DevTools/Profiler/Profile.cpp b/Userland/DevTools/Profiler/Profile.cpp
index fa06bcebe3..35fb6814ff 100644
--- a/Userland/DevTools/Profiler/Profile.cpp
+++ b/Userland/DevTools/Profiler/Profile.cpp
@@ -99,6 +99,12 @@ void Profile::rebuild_tree()
         if (!process_filter_contains(event.pid, event.timestamp))
             continue;
 
+        if (!m_show_scheduler && !event.frames.is_empty()) {
+            auto top_frame = event.frames[event.frames.size() - 1];
+            if (top_frame.symbol == "Kernel::Scheduler::yield()")
+                continue;
+        }
+
         m_filtered_event_indices.append(event_index);
 
         if (event.type == "malloc" && !live_allocations.contains(event.ptr))
@@ -450,6 +456,15 @@ void Profile::set_show_percentages(bool show_percentages)
     m_show_percentages = show_percentages;
 }
 
+void Profile::set_show_scheduler(bool show_scheduler)
+{
+    if (m_show_scheduler == show_scheduler)
+        return;
+    m_show_scheduler = show_scheduler;
+    // FIXME: This only works when kernel symbols are available
+    rebuild_tree();
+}
+
 void Profile::set_disassembly_index(const GUI::ModelIndex& index)
 {
     if (m_disassembly_index == index)