Sync our homegrown SysInfo replacement with the one in Chrome base.

src/base/sys-info.cc

Index: src/base/sys-info.cc
diff --git a/src/base/sys-info.cc b/src/base/sys-info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..203b777bee0e24070b47f16911e1b934a00084d8
--- /dev/null
+++ b/src/base/sys-info.cc
@@ -0,0 +1,122 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/base/sys-info.h"
+
+#if V8_OS_POSIX
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#if V8_OS_BSD
+#include <sys/sysctl.h>
+#endif
+
+#include <limits>
+
+#include "src/base/logging.h"
+#include "src/base/macros.h"
+#if V8_OS_WIN
+#include "src/base/win32-headers.h"
+#endif
+
+namespace v8 {
+namespace base {
+
+// static
+int SysInfo::NumberOfProcessors() {
+#if V8_OS_OPENBSD
+  int mib[2] = {CTL_HW, HW_NCPU};
+  int ncpu = 0;
+  size_t len = sizeof(ncpu);
+  if (sysctl(mib, arraysize(mib), &ncpu, &len, NULL, 0) != 0) {
+    UNREACHABLE();
+    return 1;
+  }
+  return ncpu;
+#elif V8_OS_POSIX
+  long result = sysconf(_SC_NPROCESSORS_ONLN);  // NOLINT(runtime/int)
+  if (result == -1) {
+    UNREACHABLE();
+    return 1;
+  }
+  return static_cast<int>(result);
+#elif V8_OS_WIN
+  SYSTEM_INFO system_info = {0};
+  ::GetNativeSystemInfo(&system_info);
+  return static_cast<int>(system_info.dwNumberOfProcessors);
+#endif
+}
+
+
+// static
+int64_t SysInfo::AmountOfPhysicalMemory() {
+#if V8_OS_MACOSX
+  int mib[2] = {CTL_HW, HW_MEMSIZE};
+  int64_t memsize = 0;
+  size_t len = sizeof(memsize);
+  if (sysctl(mib, arraysize(mib), &memsize, &len, NULL, 0) != 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return memsize;
+#elif V8_OS_FREEBSD
+  int pages, page_size;
+  size_t size = sizeof(pages);
+  sysctlbyname("vm.stats.vm.v_page_count", &pages, &size, NULL, 0);
+  sysctlbyname("vm.stats.vm.v_page_size", &page_size, &size, NULL, 0);
+  if (pages == -1 || page_size == -1) {
+    UNREACHABLE();
+    return 0;
+  }
+  return static_cast<int64_t>(pages) * page_size;
+#elif V8_OS_CYGWIN || V8_OS_WIN
+  MEMORYSTATUSEX memory_info;
+  memory_info.dwLength = sizeof(memory_info);
+  if (!GlobalMemoryStatusEx(&memory_info)) {
+    UNREACHABLE();
+    return 0;
+  }
+  int64_t result = static_cast<int64_t>(memory_info.ullTotalPhys);
+  if (result < 0) result = std::numeric_limits<int64_t>::max();
+  return result;
+#elif V8_OS_QNX
+  struct stat stat_buf;
+  if (stat("/proc", &stat_buf) != 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return static_cast<int64_t>(stat_buf.st_size);
+#elif V8_OS_POSIX
+  long pages = sysconf(_SC_PHYS_PAGES);    // NOLINT(runtime/int)
+  long page_size = sysconf(_SC_PAGESIZE);  // NOLINT(runtime/int)
+  if (pages == -1 || page_size == -1) {
+    UNREACHABLE();
+    return 0;
+  }
+  return static_cast<int64_t>(pages) * page_size;
+#endif
+}
+
+
+// static
+int64_t SysInfo::AmountOfVirtualMemory() {
+#if V8_OS_NACL || V8_OS_WIN
+  return 0;
+#elif V8_OS_POSIX
+  struct rlimit rlim;
+  int result = getrlimit(RLIMIT_DATA, &rlim);
+  if (result != 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return (rlim.rlim_cur == RLIM_INFINITY) ? 0 : rlim.rlim_cur;
+#endif
+}
+
+}  // namespace base
+}  // namespace v8