+#define HIBERNATION_SWAP_THRESHOLD 0.98
+
+static bool enough_memory_for_hibernation(void) {
+ _cleanup_free_ char *active = NULL, *swapfree = NULL;
+ unsigned long long act, swap;
+ int r;
+
+ r = get_status_field("/proc/meminfo", "\nSwapFree:", &swapfree);
+ if (r < 0) {
+ log_error("Failed to retrieve SwapFree from /proc/meminfo: %s", strerror(-r));
+ return false;
+ }
+
+ r = safe_atollu(swapfree, &swap);
+ if (r < 0) {
+ log_error("Failed to parse SwapFree from /proc/meminfo: %s: %s",
+ swapfree, strerror(-r));
+ return false;
+ }
+
+ r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
+ if (r < 0) {
+ log_error("Failed to retrieve Active(anon) from /proc/meminfo: %s", strerror(-r));
+ return false;
+ }
+
+ r = safe_atollu(active, &act);
+ if (r < 0) {
+ log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s",
+ active, strerror(-r));
+ return false;
+ }
+
+ r = act <= swap * HIBERNATION_SWAP_THRESHOLD;
+ log_debug("Hibernation is %spossible, Active(anon)=%llu kB, SwapFree=%llu kB, threshold=%.2g%%",
+ r ? "" : "im", act, swap, 100*HIBERNATION_SWAP_THRESHOLD);
+
+ return r;
+}
+