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Ringbuffer tail is not updated by kernel.

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This commit is contained in:
Bartosz Taudul 2021-06-03 01:14:44 +02:00
parent eb38640114
commit 483d31c1f4
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 12 additions and 9 deletions
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21
client/TracyRingBuffer.hpp
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@ -6,8 +6,8 @@ class RingBuffer
{
public:
RingBuffer( int fd, int id )
: m_fd( fd )
, m_id( id )
: m_id( id )
, m_fd( fd )
{
const auto pageSize = uint32_t( getpagesize() );
assert( Size >= pageSize );
@ -24,6 +24,7 @@ public:
m_metadata = (perf_event_mmap_page*)mapAddr;
assert( m_metadata->data_offset == pageSize );
m_buffer = ((char*)mapAddr) + pageSize;
m_tail = m_metadata->data_tail;
}
~RingBuffer()
@ -61,12 +62,12 @@ public:
bool HasData() const
{
const auto head = LoadHead();
return head > m_metadata->data_tail;
return head > m_tail;
}
void Read( void* dst, uint64_t offset, uint64_t cnt )
{
auto src = ( m_metadata->data_tail + offset ) % Size;
auto src = ( m_tail + offset ) % Size;
if( src + cnt <= Size )
{
memcpy( dst, m_buffer + src, cnt );
@ -81,7 +82,8 @@ public:
void Advance( uint64_t cnt )
{
StoreTail( m_metadata->data_tail + cnt );
m_tail += cnt;
StoreTail();
}
bool CheckTscCaps() const
@ -104,17 +106,18 @@ private:
return std::atomic_load_explicit( (const volatile std::atomic<uint64_t>*)&m_metadata->data_head, std::memory_order_acquire );
}
void StoreTail( uint64_t tail )
void StoreTail()
{
std::atomic_store_explicit( (volatile std::atomic<uint64_t>*)&m_metadata->data_tail, tail, std::memory_order_release );
std::atomic_store_explicit( (volatile std::atomic<uint64_t>*)&m_metadata->data_tail, m_tail, std::memory_order_release );
}
perf_event_mmap_page* m_metadata;
uint64_t m_tail;
char* m_buffer;
int m_id;
perf_event_mmap_page* m_metadata;
size_t m_mapSize;
int m_fd;
int m_id;
};
}