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Ringbuffer tail is not updated by kernel.
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parent
eb38640114
commit
483d31c1f4
@ -6,8 +6,8 @@ class RingBuffer
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{
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public:
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RingBuffer( int fd, int id )
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: m_fd( fd )
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, m_id( id )
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: m_id( id )
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, m_fd( fd )
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{
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const auto pageSize = uint32_t( getpagesize() );
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assert( Size >= pageSize );
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@ -24,6 +24,7 @@ public:
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m_metadata = (perf_event_mmap_page*)mapAddr;
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assert( m_metadata->data_offset == pageSize );
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m_buffer = ((char*)mapAddr) + pageSize;
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m_tail = m_metadata->data_tail;
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}
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~RingBuffer()
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@ -61,12 +62,12 @@ public:
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bool HasData() const
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{
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const auto head = LoadHead();
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return head > m_metadata->data_tail;
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return head > m_tail;
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}
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void Read( void* dst, uint64_t offset, uint64_t cnt )
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{
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auto src = ( m_metadata->data_tail + offset ) % Size;
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auto src = ( m_tail + offset ) % Size;
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if( src + cnt <= Size )
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{
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memcpy( dst, m_buffer + src, cnt );
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@ -81,7 +82,8 @@ public:
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void Advance( uint64_t cnt )
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{
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StoreTail( m_metadata->data_tail + cnt );
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m_tail += cnt;
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StoreTail();
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}
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bool CheckTscCaps() const
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@ -104,17 +106,18 @@ private:
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return std::atomic_load_explicit( (const volatile std::atomic<uint64_t>*)&m_metadata->data_head, std::memory_order_acquire );
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}
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void StoreTail( uint64_t tail )
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void StoreTail()
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{
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std::atomic_store_explicit( (volatile std::atomic<uint64_t>*)&m_metadata->data_tail, tail, std::memory_order_release );
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std::atomic_store_explicit( (volatile std::atomic<uint64_t>*)&m_metadata->data_tail, m_tail, std::memory_order_release );
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}
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perf_event_mmap_page* m_metadata;
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uint64_t m_tail;
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char* m_buffer;
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int m_id;
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perf_event_mmap_page* m_metadata;
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size_t m_mapSize;
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int m_fd;
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int m_id;
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};
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}
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