ArenaPool: make init configurable

src/App.zig

@@ -66,7 +66,7 @@ pub fn init(allocator: Allocator, config: *const Config) !*App {
     app.telemetry = try Telemetry.init(app, config.mode);
     errdefer app.telemetry.deinit();
 
-    app.arena_pool = ArenaPool.init(allocator);
+    app.arena_pool = ArenaPool.init(allocator, 512, 1024 * 16);
     errdefer app.arena_pool.deinit();
 
     return app;

src/ArenaPool.zig

@@ -36,12 +36,12 @@ const Entry = struct {
     arena: ArenaAllocator,
 };
 
-pub fn init(allocator: Allocator) ArenaPool {
+pub fn init(allocator: Allocator, free_list_max: u16, retain_bytes: usize) ArenaPool {
     return .{
         .allocator = allocator,
-        .free_list_max = 512, //  TODO make configurable
-        .retain_bytes = 1024 * 16, // TODO make configurable
-        .entry_pool = std.heap.MemoryPool(Entry).init(allocator),
+        .free_list_max = free_list_max,
+        .retain_bytes = retain_bytes,
+        .entry_pool = .init(allocator),
     };
 }