More instrumentation to track down net/ jank.

net/dns/host_resolver_impl.cc

 // Copyright (c) 2012 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/dns/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
 #endif
 
 #include <cmath>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/worker_pool.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "net/base/address_family.h"
 #include "net/base/address_list.h"
 #include "net/base/dns_reloader.h"
 #include "net/base/dns_util.h"
@@ skipping 1827 matching lines @@
   DCHECK_GT(value, 0u);
   max_queued_jobs_ = value;
 }
 
 int HostResolverImpl::Resolve(const RequestInfo& info,
                               RequestPriority priority,
                               AddressList* addresses,
                               const CompletionCallback& callback,
                               RequestHandle* out_req,
                               const BoundNetLog& source_net_log) {
+  // TODO(eroman): Remove ScopedTracker below once crbug.com/455942 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("455942 HostResolverImpl::Resolve"));
+
   DCHECK(addresses);
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(false, callback.is_null());
 
   // Check that the caller supplied a valid hostname to resolve.
   std::string labeled_hostname;
   if (!DNSDomainFromDot(info.hostname(), &labeled_hostname))
     return ERR_NAME_NOT_RESOLVED;
 
   LogStartRequest(source_net_log, info);
@@ skipping 508 matching lines @@
     dns_client_->SetConfig(dns_config);
     num_dns_failures_ = 0;
     if (dns_client_->GetConfig())
       UMA_HISTOGRAM_BOOLEAN("AsyncDNS.DnsClientEnabled", true);
   }
 
   AbortDnsTasks();
 }
 
 }  // namespace net