Profiler fixes

runtime/vm/profiler.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_PROFILER_H_
 #define VM_PROFILER_H_
 
 #include "platform/hashmap.h"
 #include "platform/thread.h"
 #include "vm/allocation.h"
@@ skipping 91 matching lines @@
     set_cpu_usage(cpu_usage);
     return delta;
   }
 
   ThreadId thread_id() const { return thread_id_; }
 
   Isolate* isolate() const { return isolate_; }
 
   SampleBuffer* sample_buffer() const { return sample_buffer_; }
 
+  void set_sample_buffer(SampleBuffer* sample_buffer) {
+    sample_buffer_ = sample_buffer;
+  }
+
  private:
   int64_t last_sampled_micros_;
   int64_t timer_expiration_micros_;
   int64_t sample_interval_micros_;
   int64_t cpu_usage_;
   ThreadId thread_id_;
   Isolate* isolate_;
   SampleBuffer* sample_buffer_;
   DISALLOW_COPY_AND_ASSIGN(IsolateProfilerData);
 };
@@ skipping 14 matching lines @@
   uintptr_t pcs[kNumStackFrames];
   uint16_t vm_tags;
   uint16_t runtime_tags;
   Sample();
 };
 
 
 // Ring buffer of samples. One per isolate.
 class SampleBuffer {
  public:
-  static const intptr_t kDefaultBufferCapacity = 1000000;
+  static const intptr_t kDefaultBufferCapacity = 120000;  // 2 minutes @ 1000hz.
 
   explicit SampleBuffer(intptr_t capacity = kDefaultBufferCapacity);
   ~SampleBuffer();
 
   intptr_t capacity() const { return capacity_; }
 
   Sample* ReserveSample();
 
   Sample* FirstSample() const;
   Sample* NextSample(Sample* sample) const;
@@ skipping 34 matching lines @@
   const uintptr_t original_pc_;
   const uintptr_t original_fp_;
   const uintptr_t original_sp_;
   uintptr_t lower_bound_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_H_