Back to UnixNano(), syscall dependency isn't worth a few nanoseconds better performance

cache.go

@@ -7,7 +7,6 @@ import (
 	"os"
 	"runtime"
 	"sync"
-	"syscall"
 	"time"
 )
 
@@ -21,9 +20,7 @@ func (item Item) Expired() bool {
 	if item.Expiration == 0 {
 		return false
 	}
-	var tv syscall.Timeval
-	syscall.Gettimeofday(&tv)
-	return tv.Nano() > item.Expiration
+	return time.Now().UnixNano() > item.Expiration
 }
 
 const (
@@ -112,9 +109,7 @@ func (c *cache) Get(k string) (interface{}, bool) {
 		return nil, false
 	}
 	if item.Expiration > 0 {
-		var tv syscall.Timeval
-		syscall.Gettimeofday(&tv)
-		if tv.Nano() > item.Expiration {
+		if time.Now().UnixNano() > item.Expiration {
 			c.mu.RUnlock()
 			return nil, false
 		}
@@ -130,9 +125,7 @@ func (c *cache) get(k string) (interface{}, bool) {
 	}
 	// "Inlining" of Expired
 	if item.Expiration > 0 {
-		var tv syscall.Timeval
-		syscall.Gettimeofday(&tv)
-		if tv.Nano() > item.Expiration {
+		if time.Now().UnixNano() > item.Expiration {
 			c.mu.RUnlock()
 			return nil, false
 		}
@@ -890,12 +883,8 @@ type keyAndValue struct {
 
 // Delete all expired items from the cache.
 func (c *cache) DeleteExpired() {
-	var (
-		evictedItems []keyAndValue
-		tv syscall.Timeval
-	)
-	syscall.Gettimeofday(&tv)
-	now := tv.Nano()
+	var evictedItems []keyAndValue
+	now := time.Now().UnixNano()
 	c.mu.Lock()
 	for k, v := range c.items {
 		// "Inlining" of expired