From b4f71a8d7e0186a717354e1064a23d5159950846 Mon Sep 17 00:00:00 2001
From: "deanm@chromium.org"
 <deanm@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Wed, 17 Sep 2008 15:32:03 +0000
Subject: Revision 2303 introduced AmountOfPhysicalMemory in SysInfo, so now
 GetSystemMemory in net/disk_cache/cache_util is redundant.

Patch from Pawel Hajdan Jr.

Review URL: http://codereview.chromium.org/3103

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2306 0039d316-1c4b-4281-b951-d872f2087c98
---
 net/disk_cache/cache_util.h        |  4 ----
 net/disk_cache/cache_util_posix.cc | 29 -----------------------------
 net/disk_cache/cache_util_win.cc   | 13 -------------
 net/disk_cache/mem_backend_impl.cc |  3 ++-
 4 files changed, 2 insertions(+), 47 deletions(-)

diff --git a/net/disk_cache/cache_util.h b/net/disk_cache/cache_util.h
index 0977472..9df9b38 100644
--- a/net/disk_cache/cache_util.h
+++ b/net/disk_cache/cache_util.h
@@ -15,10 +15,6 @@ namespace disk_cache {
 // (in bytes), or -1 on failure.
 int64 GetFreeDiskSpace(const std::wstring& path);
 
-// Returns the total physical memory on the system (in bytes),
-// or -1 on failure.
-int64 GetSystemMemory();
-
 // Moves the cache files from the given path to another location.
 // Returns true if successful, false otherwise.
 bool MoveCache(const std::wstring& from_path, const std::wstring& to_path);
diff --git a/net/disk_cache/cache_util_posix.cc b/net/disk_cache/cache_util_posix.cc
index c912e2b..6928187 100644
--- a/net/disk_cache/cache_util_posix.cc
+++ b/net/disk_cache/cache_util_posix.cc
@@ -27,35 +27,6 @@ int64 GetFreeDiskSpace(const std::wstring& path) {
   return static_cast<int64>(stats.f_bavail) * stats.f_frsize;
 }
 
-int64 GetSystemMemory() {
-#if defined(OS_LINUX)
-  // _SC_PHYS_PAGES is not part of POSIX and not available on OS X
-  long pages = sysconf(_SC_PHYS_PAGES);
-  if (pages == -1) {
-    return -1;
-  }
-  long page_size = sysconf(_SC_PAGE_SIZE);
-  if (page_size == -1) {
-    return -1;
-  }
-  int64 result = static_cast<int64>(pages) * page_size;
-  DCHECK(result > 0);
-  return result;
-#elif defined(OS_MACOSX)
-  struct host_basic_info hostinfo;
-  mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
-  int result = host_info(mach_host_self(),
-                         HOST_BASIC_INFO,
-                         reinterpret_cast<host_info_t>(&hostinfo),
-                         &count);
-  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
-  return (result == KERN_SUCCESS) ? hostinfo.max_mem : -1;
-#else
-  NOTIMPLEMENTED();
-  return -1;
-#endif
-}
-
 bool MoveCache(const std::wstring& from_path, const std::wstring& to_path) {
   // Just use the version from base.
   return file_util::Move(from_path.c_str(), to_path.c_str());
diff --git a/net/disk_cache/cache_util_win.cc b/net/disk_cache/cache_util_win.cc
index e45388b..dd4de1d 100644
--- a/net/disk_cache/cache_util_win.cc
+++ b/net/disk_cache/cache_util_win.cc
@@ -49,19 +49,6 @@ int64 GetFreeDiskSpace(const std::wstring& path) {
   return rv;
 }
 
-int64 GetSystemMemory() {
-  MEMORYSTATUSEX memory_info;
-  memory_info.dwLength = sizeof(memory_info);
-  if (!GlobalMemoryStatusEx(&memory_info)) {
-    return -1;
-  }
-
-  int64 rv = static_cast<int64>(memory_info.ullTotalPhys);
-  if (rv < 0)
-    rv = kint64max;
-  return rv;
-}
-
 bool MoveCache(const std::wstring& from_path, const std::wstring& to_path) {
   // I don't want to use the shell version of move because if something goes
   // wrong, that version will attempt to move file by file and fail at the end.
diff --git a/net/disk_cache/mem_backend_impl.cc b/net/disk_cache/mem_backend_impl.cc
index 8eb4e6a..cf4a411 100644
--- a/net/disk_cache/mem_backend_impl.cc
+++ b/net/disk_cache/mem_backend_impl.cc
@@ -4,6 +4,7 @@
 
 #include "net/disk_cache/mem_backend_impl.h"
 
+#include "base/sys_info.h"
 #include "net/disk_cache/cache_util.h"
 #include "net/disk_cache/mem_entry_impl.h"
 
@@ -40,7 +41,7 @@ bool MemBackendImpl::Init() {
   if (max_size_)
     return true;
 
-  int64 total_memory = GetSystemMemory();
+  int64 total_memory = base::SysInfo::AmountOfPhysicalMemory();
 
   if (total_memory < 0) {
     max_size_ = kDefaultCacheSize;
-- 
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