[compiler-rt] r344882 - [XRay] Account for virtual memory re-use

[Dean Michael Berris via llvm-commits]

Author: dberris
Date: Sun Oct 21 23:11:50 2018
New Revision: 344882

URL: http://llvm.org/viewvc/llvm-project?rev=344882&view=rev
Log:
[XRay] Account for virtual memory re-use

Change the assumption when releasing memory to a buffer queue that new
generations might not be able to re-use the memory mapped addresses.

Modified:
    compiler-rt/trunk/lib/xray/xray_buffer_queue.cc

Modified: compiler-rt/trunk/lib/xray/xray_buffer_queue.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/xray/xray_buffer_queue.cc?rev=344882&r1=344881&r2=344882&view=diff
==============================================================================
--- compiler-rt/trunk/lib/xray/xray_buffer_queue.cc (original)
+++ compiler-rt/trunk/lib/xray/xray_buffer_queue.cc Sun Oct 21 23:11:50 2018
@@ -124,13 +124,11 @@ BufferQueue::ErrorCode BufferQueue::rele
       return BufferQueue::ErrorCode::UnrecognizedBuffer;
     }
 
-    // This points to a semantic bug, we really ought to not be releasing more
-    // buffers than we actually get.
     if (LiveBuffers == 0) {
       Buf.Data = nullptr;
       Buf.Size = Buf.Size;
       Buf.Generation = 0;
-      return ErrorCode::NotEnoughMemory;
+      return ErrorCode::Ok;
     }
 
     --LiveBuffers;