Backed out 2 changesets (bug 1864828) for causing build bustages on TestJemalloc.cpp. CLOSED TREE

Backed out changeset c1b4a8307702 (bug 1864828)
Backed out changeset ba88f119b1fc (bug 1864828)

memory/build/Utils.h

@@ -47,6 +47,27 @@ Order CompareAddr(T* aAddr1, T* aAddr2) {
   return CompareInt(uintptr_t(aAddr1), uintptr_t(aAddr2));
 }
 
+// User-defined literals to make constants more legible
+constexpr size_t operator"" _KiB(unsigned long long int aNum) {
+  return size_t(aNum) * 1024;
+}
+
+constexpr size_t operator"" _KiB(long double aNum) {
+  return size_t(aNum * 1024);
+}
+
+constexpr size_t operator"" _MiB(unsigned long long int aNum) {
+  return size_t(aNum) * 1024_KiB;
+}
+
+constexpr size_t operator"" _MiB(long double aNum) {
+  return size_t(aNum * 1024_KiB);
+}
+
+constexpr double operator""_percent(long double aPercent) {
+  return double(aPercent) / 100;
+}
+
 // Helper for (fast) comparison of fractions without involving divisions or
 // floats.
 class Fraction {

memory/build/mozjemalloc.cpp

@@ -150,7 +150,6 @@
 #include "mozilla/DoublyLinkedList.h"
 #include "mozilla/HelperMacros.h"
 #include "mozilla/Likely.h"
-#include "mozilla/Literals.h"
 #include "mozilla/MathAlgorithms.h"
 #include "mozilla/RandomNum.h"
 // Note: MozTaggedAnonymousMmap() could call an LD_PRELOADed mmap

mfbt/Literals.h

@@ -1,37 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/* Helpers for units on integer literals. */
-
-#ifndef mozilla_Literals_h
-#define mozilla_Literals_h
-
-// User-defined literals to make constants more legible.  Use them by
-// appending them to literals such as:
-//
-// size_t page_size = 4_KiB;
-//
-constexpr size_t operator"" _KiB(unsigned long long int aNum) {
-  return size_t(aNum) * 1024;
-}
-
-constexpr size_t operator"" _KiB(long double aNum) {
-  return size_t(aNum * 1024);
-}
-
-constexpr size_t operator"" _MiB(unsigned long long int aNum) {
-  return size_t(aNum) * 1024_KiB;
-}
-
-constexpr size_t operator"" _MiB(long double aNum) {
-  return size_t(aNum * 1024_KiB);
-}
-
-constexpr double operator""_percent(long double aPercent) {
-  return double(aPercent) / 100;
-}
-
-#endif /* ! mozilla_Literals_h */

mfbt/moz.build

@@ -63,7 +63,6 @@ EXPORTS.mozilla = [
     "Latin1.h",
     "Likely.h",
     "LinkedList.h",
-    "Literals.h",
     "MacroArgs.h",
     "MacroForEach.h",
     "MathAlgorithms.h",

modules/libpref/init/StaticPrefList.yaml

@@ -11054,11 +11054,6 @@
   value: @IS_EARLY_BETA_OR_EARLIER@
   mirror: always
 
-- name: memory.phc.min_ram_mb
-  type: uint32_t
-  value: 8000
-  mirror: always
-
 #---------------------------------------------------------------------------
 # Prefs starting with "midi."
 #---------------------------------------------------------------------------

toolkit/components/nimbus/FeatureManifest.yaml

@@ -2011,10 +2011,6 @@ phc:
       description: Whether to enable PHC
       type: boolean
       setPref: memory.phc.enabled
-    phcMinRamMB:
-      description: The minimum amount of RAM required to enable PHC
-      type: int
-      setPref: memory.phc.min_ram_mb
 
 mailto:
   description: Prefs to control aspects of the mailto handler

xpcom/base/PHCManager.cpp

@@ -7,7 +7,6 @@
 #include "PHCManager.h"
 
 #include "PHC.h"
-#include "mozilla/Literals.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/StaticPrefs_memory.h"
 #include "mozilla/Telemetry.h"
@@ -17,37 +16,31 @@ namespace mozilla {
 
 using namespace phc;
 
-static const char kPHCEnabledPref[] = "memory.phc.enabled";
-static const char kPHCMinRamMBPref[] = "memory.phc.min_ram_mb";
+static const char kPHCPref[] = "memory.phc.enabled";
 
-static void UpdatePHCState() {
-  size_t mem_size = PR_GetPhysicalMemorySize() / (1_MiB);
-  size_t min_mem_size = StaticPrefs::memory_phc_min_ram_mb();
+static PHCState GetPHCStateFromPref() {
+  return StaticPrefs::memory_phc_enabled() ? Enabled : OnlyFree;
+}
 
+static void PrefChangeCallback(const char* aPrefName, void* aNull) {
+  MOZ_ASSERT(0 == strcmp(aPrefName, kPHCPref));
+
+  SetPHCState(GetPHCStateFromPref());
+}
+
+void InitPHCState() {
+  size_t memSize = PR_GetPhysicalMemorySize();
   // Only enable PHC if there are at least 8GB of ram.  Note that we use
   // 1000 bytes per kilobyte rather than 1024.  Some 8GB machines will have
   // slightly lower actual RAM available after some hardware devices
   // reserve some.
-  if (StaticPrefs::memory_phc_enabled() && mem_size >= min_mem_size) {
-    SetPHCState(Enabled);
-  } else {
-    SetPHCState(OnlyFree);
+  if (memSize >= size_t(8'000'000'000llu)) {
+    SetPHCState(GetPHCStateFromPref());
+
+    Preferences::RegisterCallback(PrefChangeCallback, kPHCPref);
   }
 }
 
-static void PrefChangeCallback(const char* aPrefName, void* aNull) {
-  MOZ_ASSERT((0 == strcmp(aPrefName, kPHCEnabledPref)) ||
-             (0 == strcmp(aPrefName, kPHCMinRamMBPref)));
-
-  UpdatePHCState();
-}
-
-void InitPHCState() {
-  Preferences::RegisterCallback(PrefChangeCallback, kPHCEnabledPref);
-  Preferences::RegisterCallback(PrefChangeCallback, kPHCMinRamMBPref);
-  UpdatePHCState();
-}
-
 void ReportPHCTelemetry() {
   MemoryUsage usage;
   PHCMemoryUsage(usage);