Function get_tls_block_count

src/butil/iobuf.cpp:256–256

// Used in UT
IOBuf::Block* get_tls_block_head() { return g_tls_data.block_head; }
int get_tls_block_count() { return g_tls_data.num_blocks; }

// Number of blocks that can't be returned to TLS which has too many block
// already. This counter should be 0 in most scenarios, otherwise performance