From a893e685b02590ec4edd3062ce5841881c1edbd6 Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Wed, 19 Nov 2014 20:01:32 -0600
Subject: [PATCH] Don't allocate pieces map unless necessary when filling
 responsive requests

---
 download_strategies.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/download_strategies.go b/download_strategies.go
index bc728759..e0e79814 100644
--- a/download_strategies.go
+++ b/download_strategies.go
@@ -176,6 +176,9 @@ type requestFiller struct {
 
 // Wrapper around connection.request that tracks request heat.
 func (me *requestFiller) request(req request) bool {
+	if me.pieces == nil {
+		me.pieces = make(map[int]struct{})
+	}
 	me.pieces[int(req.Index)] = struct{}{}
 	if me.c.RequestPending(req) {
 		return true
@@ -330,7 +333,7 @@ func (me *requestFiller) readahead() bool {
 }
 
 func (me *responsiveDownloadStrategy) FillRequests(t *torrent, c *connection) (pieces []int) {
-	rf := requestFiller{c, t, me, make(map[int]struct{}, t.NumPieces())}
+	rf := requestFiller{c: c, t: t, s: me}
 	rf.Run()
 	for p := range rf.pieces {
 		pieces = append(pieces, p)
-- 
2.48.1