From b07b208a4aaf6f0c060dfe8099a9172b6ba08ac9 Mon Sep 17 00:00:00 2001
From: Arvid Norberg <arvid@libtorrent.org>
Date: Sun, 5 Apr 2015 19:35:58 +0000
Subject: [PATCH] rate limit how often recalculate_auto_managed can be called
 (it's expensive)

---
 include/libtorrent/aux_/session_impl.hpp | 4 ++++
 src/session_impl.cpp                     | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/libtorrent/aux_/session_impl.hpp b/include/libtorrent/aux_/session_impl.hpp
index af5e5e521..ffc7ee25c 100644
--- a/include/libtorrent/aux_/session_impl.hpp
+++ b/include/libtorrent/aux_/session_impl.hpp
@@ -976,6 +976,10 @@ namespace libtorrent
 			// to decide which ones to choke/unchoke
 			time_point m_last_choke;
 
+			// the last time we recalculated which torrents should be started
+			// and stopped (only the auto managed ones)
+			time_point m_last_auto_manage;
+
 #ifndef TORRENT_NO_DEPRECATE
 			// the time when the next rss feed needs updating
 			time_point m_next_rss_update;
diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index c2c26fd83..d3655e5de 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -390,6 +390,7 @@ namespace aux {
 		, m_last_tick(m_created)
 		, m_last_second_tick(m_created - milliseconds(900))
 		, m_last_choke(m_created)
+		, m_last_auto_manage(m_created)
 #ifndef TORRENT_NO_DEPRECATE
 		, m_next_rss_update(min_time())
 #endif
@@ -3494,6 +3495,7 @@ retry:
 	{
 		INVARIANT_CHECK;
 
+		m_last_auto_manage = time_now_hires();
 		m_need_auto_manage = false;
 
 		if (is_paused()) return;
@@ -5918,6 +5920,13 @@ retry:
 	{
 		if (m_pending_auto_manage || m_abort) return;
 
+		// we we recalculated auto-managed torrents less than a second ago,
+		// put it off one second.
+		if (time_now_hires() - m_last_auto_manage < seconds(1))
+		{
+			m_auto_manage_time_scaler = 0;
+			return;
+		}
 		m_pending_auto_manage = true;
 		m_need_auto_manage = true;