From 9232b8275f1f5d1e7bf1b66206d44a7baa735c93 Mon Sep 17 00:00:00 2001
From: Aaron Jacobs <jacobsa@google.com>
Date: Tue, 28 Jul 2015 12:52:38 +1000
Subject: [PATCH] Don't convert uint64 to interface{} for the context key every
 time.

This accounts for ~80% of gcsfuse allocations.
---
 connection.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/connection.go b/connection.go
index 8304032..102a07d 100644
--- a/connection.go
+++ b/connection.go
@@ -32,7 +32,7 @@ import (
 
 type contextKeyType uint64
 
-const contextKey contextKeyType = 0
+var contextKey interface{} = contextKeyType(0)
 
 // Ask the Linux kernel for larger read requests.
 //
@@ -447,7 +447,9 @@ func (c *Connection) ReadOp() (ctx context.Context, op interface{}, err error) {
 // LOCKS_EXCLUDED(c.mu)
 func (c *Connection) Reply(ctx context.Context, opErr error) {
 	// Extract the state we stuffed in earlier.
-	state, ok := ctx.Value(contextKey).(opState)
+	var key interface{} = contextKey
+	foo := ctx.Value(key)
+	state, ok := foo.(opState)
 	if !ok {
 		panic(fmt.Sprintf("Reply called with invalid context: %#v", ctx))
 	}