Fix KMEM_DEBUG support (enable by default)

Add vmem_alloc/vmem_free support (and test case)
Add missing time functions



git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@46 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c

modules/spl/spl-kmem.c

@@ -7,6 +7,13 @@
 /* Shim layer memory accounting */
 atomic_t kmem_alloc_used;
 unsigned int kmem_alloc_max;
+atomic_t vmem_alloc_used;
+unsigned int vmem_alloc_max;
+
+EXPORT_SYMBOL(kmem_alloc_used);
+EXPORT_SYMBOL(kmem_alloc_max);
+EXPORT_SYMBOL(vmem_alloc_used);
+EXPORT_SYMBOL(vmem_alloc_max);
 #endif
 
 /*

modules/spl/spl-time.c

@@ -7,5 +7,31 @@ __gethrestime(timestruc_t *ts)
 {
 	getnstimeofday((struct timespec *)ts);
 }
-
 EXPORT_SYMBOL(__gethrestime);
+
+int
+__clock_gettime(clock_type_t type, timespec_t *tp)
+{
+	/* Only support CLOCK_REALTIME+__CLOCK_REALTIME0 for now */
+        BUG_ON(!((type == CLOCK_REALTIME) || (type == __CLOCK_REALTIME0)));
+
+        getnstimeofday(tp);
+        return 0;
+}
+EXPORT_SYMBOL(__clock_gettime);
+
+/* This function may not be as fast as using monotonic_clock() but it
+ * should be much more portable, if performance becomes as issue we can
+ * look at using monotonic_clock() for x86_64 and x86 arches.
+ */
+hrtime_t
+__gethrtime(void) {
+        timespec_t tv;
+        hrtime_t rc;
+
+        do_posix_clock_monotonic_gettime(&tv);
+        rc = (NSEC_PER_SEC * (hrtime_t)tv.tv_sec) + (hrtime_t)tv.tv_nsec;
+
+        return rc;
+}
+EXPORT_SYMBOL(__gethrtime);