Kernel: Use KString for Region names

Replace the AK::String used for Region::m_name with a KString.

This seems beneficial across the board, but as a specific data point,
it reduces time spent in sys$set_mmap_name() by ~50% on test-js. :^)

1 files changed, 5 insertions, 1 deletions

diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
index e08ea0a2d9..3939d0d82b 100644
--- a/Kernel/Thread.cpp
+++ b/Kernel/Thread.cpp
@@ -67,7 +67,11 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stac
         m_tid = Process::allocate_pid().value();
     }
 
-    m_kernel_stack_region->set_name(String::formatted("Kernel stack (thread {})", m_tid.value()));
+    {
+        // FIXME: Go directly to KString
+        auto string = String::formatted("Kernel stack (thread {})", m_tid.value());
+        m_kernel_stack_region->set_name(KString::try_create(string));
+    }
 
     {
         ScopedSpinLock lock(g_tid_map_lock);