go vendor; track uptime, health

vendor/github.com/inconshreveable/log15/stack/stack_pool.go

@@ -0,0 +1,19 @@
+// +build go1.3
+
+package stack
+
+import (
+	"sync"
+)
+
+var pcStackPool = sync.Pool{
+	New: func() interface{} { return make([]uintptr, 1000) },
+}
+
+func poolBuf() []uintptr {
+	return pcStackPool.Get().([]uintptr)
+}
+
+func putPoolBuf(p []uintptr) {
+	pcStackPool.Put(p)
+}