Revert of Fix free memory calculation.

base/sys_info_linux.cc

Index: base/sys_info_linux.cc
diff --git a/base/sys_info_linux.cc b/base/sys_info_linux.cc
index 0cd05b363a23e34ae270ececb8c995305cd3eded..298d245ecf580da4d8790f5dc47f851c0208ab5d 100644
--- a/base/sys_info_linux.cc
+++ b/base/sys_info_linux.cc
@@ -13,7 +13,6 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
-#include "base/process/process_metrics.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/sys_info_internal.h"
 #include "build/build_config.h"
@@ -43,29 +42,13 @@
 namespace base {
 
 // static
-int64_t SysInfo::AmountOfPhysicalMemory() {
-  return g_lazy_physical_memory.Get().value();
+int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
+  return AmountOfMemory(_SC_AVPHYS_PAGES);
 }
 
 // static
-int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
-  SystemMemoryInfoKB info;
-  if (!GetSystemMemoryInfo(&info))
-    return 0;
-  return AmountOfAvailablePhysicalMemory(info);
-}
-
-// static
-int64_t SysInfo::AmountOfAvailablePhysicalMemory(
-    const SystemMemoryInfoKB& info) {
-  // See details here:
-  // https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
-  // The fallback logic (when there is no MemAvailable) would be more precise
-  // if we had info about zones watermarks (/proc/zoneinfo).
-  int64_t res_kb = info.available != 0
-                       ? info.available - info.active_file
-                       : info.free + info.reclaimable + info.inactive_file;
-  return res_kb * 1024;
+int64_t SysInfo::AmountOfPhysicalMemory() {
+  return g_lazy_physical_memory.Get().value();
 }
 
 // static