Linux: Increase storage size of vmstat data

base/process/process_metrics_linux.cc

 // Copyright (c) 2013 The Chromium 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 "base/process/process_metrics.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 658 matching lines @@
   // We iterate through the whole file because the position of the
   // fields are dependent on the kernel version and configuration.
 
   for (const StringPiece& line : SplitStringPiece(
            vmstat_data, "\n", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY)) {
     std::vector<StringPiece> tokens = SplitStringPiece(
         line, " ", KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY);
     if (tokens.size() != 2)
       continue;
 
+    uint64_t val;
+    if (!StringToUint64(tokens[1], &val))
+      continue;
+
     if (tokens[0] == "pswpin") {
-      StringToInt(tokens[1], &meminfo->pswpin);
+      meminfo->pswpin = val;

[Lei Zhang, 2016/07/28 18:38:05]

Can we just make pswpin and friends uint64_t? Aren't there systems where long is
only 4 bytes?

     } else if (tokens[0] == "pswpout") {
-      StringToInt(tokens[1], &meminfo->pswpout);
+      meminfo->pswpout = val;
     } else if (tokens[0] == "pgmajfault") {
-      StringToInt(tokens[1], &meminfo->pgmajfault);
+      meminfo->pgmajfault = val;
     }
   }
 
   return true;
 }
 
 bool GetSystemMemoryInfo(SystemMemoryInfoKB* meminfo) {
   // Synchronously reading files in /proc and /sys are safe.
   ThreadRestrictions::ScopedAllowIO allow_io;
 
@@ skipping 252 matching lines @@
 #if defined(OS_LINUX)
 int ProcessMetrics::GetIdleWakeupsPerSecond() {
   uint64_t wake_ups;
   const char kWakeupStat[] = "se.statistics.nr_wakeups";
   return ReadProcSchedAndGetFieldAsUint64(process_, kWakeupStat, &wake_ups) ?
       CalculateIdleWakeupsPerSecond(wake_ups) : 0;
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace base