Auto-update dependencies (#178)

Produced via:
  `dep ensure -update knative.dev/test-infra knative.dev/pkg`
/assign n3wscott
/cc n3wscott

Gopkg.lock

@@ -940,7 +940,7 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:453e21d9c4385548ef0829f4509961f2d6b19b573fd830a5739a7fea8a8d6290"
+  digest = "1:b21a3ea7ad9b920c6d1c2b26d11eba1d2ed4ee5d88b03f20f1efd46a6eaab902"
   name = "knative.dev/pkg"
   packages = [
     "apis",
@@ -959,7 +959,7 @@
     "metrics/metricskey",
   ]
   pruneopts = "T"
-  revision = "298f22bea61fb6a0e8d55546563908e4787f9ac2"
+  revision = "8c62412074275c22632e23fbe726555bf970ba6c"
 
 [[projects]]
   branch = "master"

vendor/knative.dev/pkg/metrics/README.md

@@ -93,9 +93,9 @@ statistics for a short period of time if not.
 - [ ] Ensure that all tests pass in a non-Google-Cloud connected environment.
       **This is true today.**
       [Ensure this on an ongoing basis.](https://github.com/knative/pkg/issues/957)
-- [ ] Google to implement OpenCensus Agent configuration to match what they
-      are doing for Stackdriver now. (No public issue link because this shoud be
-      in Google's vendor-specific configuration.)
+- [ ] Google to implement OpenCensus Agent configuration to match what they are
+      doing for Stackdriver now. (No public issue link because this shoud be in
+      Google's vendor-specific configuration.)
 - [ ] Document how to configure OpenCensus/OpenTelemetry Agent + Prometheus to
       achieve the current level of application visibility, and determine a
       long-term course for how to maintain this as a "bare minimum" supported

vendor/knative.dev/pkg/profiling/server.go

@@ -21,7 +21,7 @@ import (
 	"net/http"
 	"net/http/pprof"
 	"strconv"
-	"sync"
+	"sync/atomic"
 
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
@@ -39,10 +39,9 @@ const (
 // Handler holds the main HTTP handler and a flag indicating
 // whether the handler is active
 type Handler struct {
-	enabled    bool
-	enabledMux sync.Mutex
-	handler    http.Handler
-	log        *zap.SugaredLogger
+	enabled int32
+	handler http.Handler
+	log     *zap.SugaredLogger
 }
 
 // NewHandler create a new ProfilingHandler which serves runtime profiling data
@@ -58,18 +57,15 @@ func NewHandler(logger *zap.SugaredLogger, enableProfiling bool) *Handler {
 	mux.HandleFunc(pprofPrefix+"trace", pprof.Trace)
 
 	logger.Infof("Profiling enabled: %t", enableProfiling)
-
 	return &Handler{
-		enabled: enableProfiling,
+		enabled: boolToInt32(enableProfiling),
 		handler: mux,
 		log:     logger,
 	}
 }
 
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	h.enabledMux.Lock()
-	defer h.enabledMux.Unlock()
-	if h.enabled {
+	if atomic.LoadInt32(&h.enabled) == 1 {
 		h.handler.ServeHTTP(w, r)
 	} else {
 		http.NotFoundHandler().ServeHTTP(w, r)
@@ -96,11 +92,11 @@ func (h *Handler) UpdateFromConfigMap(configMap *corev1.ConfigMap) {
 		h.log.Errorw("Failed to update the profiling flag", zap.Error(err))
 		return
 	}
-	h.enabledMux.Lock()
-	defer h.enabledMux.Unlock()
-	if h.enabled != enabled {
-		h.enabled = enabled
-		h.log.Infof("Profiling enabled: %t", h.enabled)
+
+	new := boolToInt32(enabled)
+	old := atomic.SwapInt32(&h.enabled, new)
+	if old != new {
+		h.log.Infof("Profiling enabled: %t", enabled)
 	}
 }
 
@@ -111,3 +107,10 @@ func NewServer(handler http.Handler) *http.Server {
 		Handler: handler,
 	}
 }
+
+func boolToInt32(b bool) int32 {
+	if b {
+		return 1
+	}
+	return 0
+}