From: Jon Maltiel Swenson <jmswen@fb.com>
Date: Wed, 27 Apr 2016 01:12:20 +0000 (-0700)
Subject: Optimize away IOBuf clones on hot path
X-Git-Tag: 2016.07.26~319
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=4aa901d0f9198b17c23adce704d18d767c033533;p=folly.git

Optimize away IOBuf clones on hot path

Summary:
'get' is the most frequent memcached operation. On a get reply, we should go to heap
as little as possible.  This diff optimizes for this scenario, where replies
have only one IOBuf field.

Reviewed By: pavlo-fb

Differential Revision: D3226592

fb-gh-sync-id: 92e1a1fac5735bd268691cf11990a96ae6fa8309
fbshipit-source-id: 92e1a1fac5735bd268691cf11990a96ae6fa8309
---

diff --git a/folly/io/Cursor.h b/folly/io/Cursor.h
index 3cf369e9..a1309239 100644
--- a/folly/io/Cursor.h
+++ b/folly/io/Cursor.h
@@ -913,6 +913,10 @@ class QueueAppender : public detail::Writable<QueueAppender> {
     }
   }
 
+  void insert(const folly::IOBuf& buf) {
+    insert(buf.clone());
+  }
+
  private:
   folly::IOBufQueue* queue_;
   size_t growth_;