Convert to_dynamic_unit to OwnedStringView and rename the old variant to to_dynamic_unit_cstr

kernel/src/main.cpp

@@ -4,6 +4,7 @@
 #include "arch/Timer.h"
 #include "boot/Init.h"
 #include "config.h"
+#include "memory/Heap.h"
 #include "memory/MemoryManager.h"
 #include "thread/Scheduler.h"
 #include <luna/Result.h>
@@ -23,6 +24,13 @@ void async_thread()
     }
 }
 
+void heap_thread()
+{
+    CPU::disable_interrupts();
+    dump_heap_usage();
+    while (true) kernel_sleep(UINT64_MAX);
+}
+
 Result<void> init()
 {
     kinfoln("Starting Moon %s", MOON_VERSION);
@@ -33,19 +41,15 @@ Result<void> init()
 
     Timer::init();
 
-    char buffer[64];
-    to_dynamic_unit(MemoryManager::total(), buffer, sizeof(buffer));
-    kinfoln("Total memory:    %s", buffer);
-    to_dynamic_unit(MemoryManager::free(), buffer, sizeof(buffer));
-    kinfoln("Free memory:     %s", buffer);
-    to_dynamic_unit(MemoryManager::used(), buffer, sizeof(buffer));
-    kinfoln("Used memory:     %s", buffer);
-    to_dynamic_unit(MemoryManager::reserved(), buffer, sizeof(buffer));
-    kinfoln("Reserved memory: %s", buffer);
+    kinfoln("Total memory:    %s", to_dynamic_unit(MemoryManager::total()).release_value().chars());
+    kinfoln("Free memory:     %s", to_dynamic_unit(MemoryManager::free()).release_value().chars());
+    kinfoln("Used memory:     %s", to_dynamic_unit(MemoryManager::used()).release_value().chars());
+    kinfoln("Reserved memory: %s", to_dynamic_unit(MemoryManager::reserved()).release_value().chars());
 
     Scheduler::init();
 
     TRY(Scheduler::new_kernel_thread(async_thread));
+    TRY(Scheduler::new_kernel_thread(heap_thread));
 
     CPU::platform_finish_init();
 

luna/include/luna/Units.h

@@ -1,4 +1,6 @@
 #pragma once
+#include <luna/OwnedStringView.h>
 #include <luna/Result.h>
 
-Result<usize> to_dynamic_unit(usize value, char* buffer, usize max);
+Result<usize> to_dynamic_unit_cstr(usize value, char* buffer, usize max);
+Result<OwnedStringView> to_dynamic_unit(usize value);

luna/src/Units.cpp

@@ -1,8 +1,10 @@
+#include <luna/Alloc.h>
 #include <luna/Format.h>
 #include <luna/Result.h>
+#include <luna/ScopeGuard.h>
 #include <luna/Units.h>
 
-Result<usize> to_dynamic_unit(usize value, char* buffer, usize max)
+Result<usize> to_dynamic_unit_cstr(usize value, char* buffer, usize max)
 {
     if (value < 1024) { return string_format(buffer, max, "%u bytes", value); }
 
@@ -15,3 +17,16 @@ Result<usize> to_dynamic_unit(usize value, char* buffer, usize max)
 
     return string_format(buffer, max, "%u.%u %ciB", value / 1024, (value % 1024) / 103, *unit_prefixes);
 }
+
+Result<OwnedStringView> to_dynamic_unit(usize value)
+{
+    char* buf = TRY(make_array<char>(64));
+
+    auto guard = make_scope_guard([&] { destroy_array(buf); });
+
+    TRY(to_dynamic_unit_cstr(value, buf, 64));
+
+    guard.deactivate();
+
+    return OwnedStringView{buf};
+}