Print some rusage info in debug

uvloop/loop.pyx

@@ -445,11 +445,29 @@ cdef class Loop:
 
     IF DEBUG:
         def print_debug_info(self):
-            print('\n--- Loop debug info: ---')
+            cdef:
+                int err
+                uv.uv_rusage_t rusage
+            err = uv.uv_getrusage(&rusage)
+            if err < 0:
+                raise convert_error(err)
+
+            ################### OS
+
+            print('---- Process info: -----')
+            print('Process memory:    ', rusage.ru_maxrss)
+            print('Number of signals: ', rusage.ru_nsignals)
+            print('')
+
+            ################### Loop
+
+            print('--- Loop debug info: ---')
+            print('Loop time:        {}'.format(self.time()))
+            print()
 
             print('UVHandles (current | total):')
             for name in sorted(self._debug_handles_total):
-                print('    {: <18}: {: >5} | {}'.format(
+                print('    {: <18} {: >5} | {}'.format(
                     name,
                     self._debug_handles_count[name],
                     self._debug_handles_total[name]))
@@ -468,7 +486,8 @@ cdef class Loop:
                 self._debug_cb_timer_handles_total))
             print()
 
-            print('------------------------\n', flush=True)
+            print('------------------------')
+            print(flush=True)
 
     def __repr__(self):
         return ('<%s running=%s closed=%s debug=%s>'

uvloop/uv.pxd

@@ -267,3 +267,29 @@ cdef extern from "../vendor/libuv/include/uv.h":
                             uv_os_sock_t socket)
     int uv_poll_start(uv_poll_t* handle, int events, uv_poll_cb cb)
     int uv_poll_stop(uv_poll_t* poll)
+
+    # Misc
+
+    ctypedef struct uv_timeval_t:
+        long tv_sec
+        long tv_usec
+
+    ctypedef struct uv_rusage_t:
+        uv_timeval_t ru_utime   # user CPU time used
+        uv_timeval_t ru_stime   # system CPU time used
+        uint64_t ru_maxrss      # maximum resident set size
+        uint64_t ru_ixrss       # integral shared memory size
+        uint64_t ru_idrss       # integral unshared data size
+        uint64_t ru_isrss       # integral unshared stack size
+        uint64_t ru_minflt      # page reclaims (soft page faults)
+        uint64_t ru_majflt      # page faults (hard page faults)
+        uint64_t ru_nswap       # swaps
+        uint64_t ru_inblock     # block input operations
+        uint64_t ru_oublock     # block output operations
+        uint64_t ru_msgsnd      # IPC messages sent
+        uint64_t ru_msgrcv      # IPC messages received
+        uint64_t ru_nsignals    # signals received
+        uint64_t ru_nvcsw       # voluntary context switches
+        uint64_t ru_nivcsw      # involuntary context switches
+
+    int uv_getrusage(uv_rusage_t* rusage)