Current RSS on linux and android too?

tools/ProcStats.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "ProcStats.h"
 
 #if defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_ANDROID)
@@ skipping 23 matching lines @@
     #include <mach/mach.h>
     int sk_tools::getCurrResidentSetSizeMB() {
         mach_task_basic_info info;
         mach_msg_type_number_t count = MACH_TASK_BASIC_INFO_COUNT;
         if (KERN_SUCCESS !=
                 task_info(mach_task_self(), MACH_TASK_BASIC_INFO, (task_info_t)&info, &count)) {
             return -1;
         }
         return info.resident_size / 1024 / 1024;  // Darwin reports bytes.
     }
+#elif defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_ANDROID)  // N.B. /proc is Linux-only.
+    #include <unistd.h>
+    #include <stdio.h>
+    int sk_tools::getCurrResidentSetSizeMB() {
+        const long pageSize = sysconf(_SC_PAGESIZE);
+        long rssPages = 0;
+        if (FILE* statm = fopen("/proc/self/statm", "r")) {
+            // statm contains: program-size rss shared text lib data dirty, all in page counts.
+            int rc = fscanf(statm, "%*d %ld", &rssPages);
+            fclose(statm);
+            if (rc != 1) {
+                return -1;
+            }
+        }
+        return rssPages * pageSize / 1024 / 1024;
+    }
+
 #elif defined(SK_BUILD_FOR_WIN32)
     int sk_tools::getCurrResidentSetSizeMB() {
         PROCESS_MEMORY_COUNTERS info;
         GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
         return static_cast<int>(info.WorkingSetSize / 1024 / 1024);  // Windows reports bytes.
     }
 #else
     int sk_tools::getCurrResidentSetSizeMB() { return -1; }
 #endif