Make Quic client more memory efficient. Protected by --quic_headers_stream_release_sequencer_buffer.

net/quic/core/quic_headers_stream.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_headers_stream.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 443 matching lines @@
       break;
     }
     DCHECK(timestamp.IsInitialized());
     cur_max_timestamp_ = std::max(timestamp, cur_max_timestamp_);
     if (spdy_framer_.ProcessInput(static_cast<char*>(iov.iov_base),
                                   iov.iov_len) != iov.iov_len) {
       // Error processing data.
       return;
     }
     sequencer()->MarkConsumed(iov.iov_len);
+    MaybeReleaseSequencerBuffer();
   }
 }
 
 void QuicHeadersStream::set_max_uncompressed_header_bytes(
     size_t set_max_uncompressed_header_bytes) {
   spdy_framer_visitor_->set_max_uncompressed_header_bytes(
       set_max_uncompressed_header_bytes);
 }
 
 void QuicHeadersStream::OnHeaders(SpdyStreamId stream_id,
@@ skipping 88 matching lines @@
 }
 
 void QuicHeadersStream::UpdateHeaderEncoderTableSize(uint32_t value) {
   spdy_framer_.UpdateHeaderEncoderTableSize(value);
 }
 
 void QuicHeadersStream::UpdateEnableServerPush(bool value) {
   spdy_session_->set_server_push_enabled(value);
 }
 
+void QuicHeadersStream::MaybeReleaseSequencerBuffer() {
+  if (FLAGS_quic_headers_stream_release_sequencer_buffer &&
+      spdy_session_->ShouldReleaseHeadersStreamSequencerBuffer()) {
+    sequencer()->ReleaseBufferIfEmpty();
+  }
+}
+
 bool QuicHeadersStream::OnDataFrameHeader(QuicStreamId stream_id,
                                           size_t length,
                                           bool fin) {
   if (!spdy_session_->force_hol_blocking()) {
     return false;
   }
   if (!IsConnected()) {
     return true;
   }
   DVLOG(1) << "DATA frame header for stream " << stream_id << " length "
@@ skipping 16 matching lines @@
     return true;
   }
   frame_len_ -= len;
   // Ignore fin_ while there is more data coming, if frame_len_ > 0.
   spdy_session_->OnStreamFrameData(stream_id, data, len,
                                    frame_len_ > 0 ? false : fin_);
   return true;
 }
 
 }  // namespace net