Bug 1636398 - Tweak default profiler buffer size in tests - r=canaltinova

Also removed explicit size in test_feature_nativeallocations, as we want a reasonably-big buffer in this test.

Other tests with small buffer sizes are fine, since the profiler imposes a minimum size that should be big enough to capture at least 8 large stacks (see bug 1571171).

Differential Revision: https://phabricator.services.mozilla.com/D74588

tools/profiler/tests/shared-head.js

@@ -11,7 +11,7 @@
 var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 const defaultSettings = {
-  entries: 1000000, // 9MB
+  entries: 8 * 1024 * 1024, // 8M entries = 64MB
   interval: 1, // ms
   features: ["threads"],
   threads: ["GeckoMain"],

tools/profiler/tests/xpcshell/test_feature_nativeallocations.js

@@ -28,7 +28,6 @@ add_task(async () => {
   {
     info("Start the profiler.");
     startProfiler({
-      entries: 1e6,
       // Only instrument the main thread.
       threads: ["GeckoMain"],
       features: ["threads", "leaf", "nativeallocations"],