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Remove call to memset in EventPipeBuffer constructor #41194

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Aug 22, 2020
Merged

Remove call to memset in EventPipeBuffer constructor #41194

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7 changes: 0 additions & 7 deletions src/coreclr/src/vm/eventpipebuffer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,13 +30,6 @@ EventPipeBuffer::EventPipeBuffer(unsigned int bufferSize, EventPipeThread* pWrit
// to servicing releases. We may come back in the future to reassess this and potentially improve
// the throughput via more performant solution afterwards.
m_pBuffer = (BYTE*)ClrVirtualAlloc(NULL, bufferSize, MEM_COMMIT, PAGE_READWRITE);

// memset may be unnecessary here because VirtualAlloc with MEM_COMMIT zero-initializes the pages and mmap also zero-initializes
// if MAP_UNINITIALIZED isn't passed (which ClrVirtualAlloc doesn't). If this memset ends up being a perf cost in future investigations
// we may remove this. But for risk mitigation we're leaving it as-is.
// (See https://github.com/dotnet/runtime/pull/35924#discussion_r421282564 for discussion on this)
memset(m_pBuffer, 0, bufferSize);

m_pLimit = m_pBuffer + bufferSize;
m_pCurrent = GetNextAlignedAddress(m_pBuffer);

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