If sysconfig fails, fallback to sysinfo

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 c698f911db516fdb3a178ecb9e1c15ac18e0ce35..5af8c270357b84b1e6da9279d5b3e6d1e2670049 100644
--- a/base/sys_info_linux.cc
+++ b/base/sys_info_linux.cc
@@ -5,6 +5,7 @@
 #include "base/sys_info.h"
 
 #include <limits>
+#include <sys/sysinfo.h>
 
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
@@ -15,11 +16,19 @@
 namespace {
 
 int64 AmountOfMemory(int pages_name) {
+  DCHECK(pages_name == _SC_PHYS_PAGES || pages_name == _SC_AVPHYS_PAGES);
   long pages = sysconf(pages_name);
   long page_size = sysconf(_SC_PAGESIZE);
   if (pages == -1 || page_size == -1) {
-    NOTREACHED();
-    return 0;
+    struct sysinfo si;
+    int ret = sysinfo(&si);
+    DCHECK_EQ(ret, 0);
+    if (pages_name == _SC_PHYS_PAGES) {
+      return static_cast<int64>(si.totalram) * si.mem_unit;
+    } else {
+      // _SC_ACPHYS_PAGES
+      return static_cast<int64>(si.freeram) * si.mem_unit;
+    }
   }
   return static_cast<int64>(pages) * page_size;
 }