|          
       --91.21%--btgettuple
                 |          
                 |--58.16%--_bt_first
                 |          |          
                 |          |--41.47%--_bt_search
                 |          |          |          
                 |          |           --41.07%--_bt_relandgetbuf
                 |          |                     |          
                 |          |                     |--39.39%--ReadBufferExtended
                 |          |                     |          StartReadBuffer
                 |          |                     |          |          
                 |          |                     |           --38.46%--PinBuffer
                 |          |                     |                     |          
                 |          |                     |                     |--29.14%--WaitBufHdrUnlocked (inlined)
                 |          |                     |                     |          
                 |          |                     |                      --8.83%--pg_atomic_compare_exchange_u32 (inlined)
                 |          |                     |                                pg_atomic_compare_exchange_u32_impl (inlined)
                 |          |                     |          
                 |          |                      --1.63%--_bt_lockbuf (inlined)
                 |          |                                LWLockAcquire
                 |          |                                |          
                 |          |                                 --1.62%--LWLockAttemptLock (inlined)
                 |          |                                           |          
                 |          |                                            --1.37%--pg_atomic_compare_exchange_u32 (inlined)
                 |          |                                                      pg_atomic_compare_exchange_u32_impl (inlined)
                 |          |          
                 |           --16.51%--_bt_readfirstpage
                 |                     |          
                 |                     |--15.45%--_bt_readpage
                 |                     |          |          
                 |                     |          |--14.29%--BufferGetLSNAtomic
                 |                     |          |          |          
                 |                     |          |           --13.86%--LockBufHdr
                 |                     |          |          
                 |                     |           --0.67%--BufferGetBlockNumber
                 |                     |          
                 |                      --1.06%--LWLockRelease
                 |                                LWLockReleaseInternal
                 |                                pg_atomic_sub_fetch_u32 (inlined)
                 |                                pg_atomic_sub_fetch_u32_impl (inlined)
                 |                                pg_atomic_fetch_sub_u32_impl (inlined)
                 |          
                  --33.05%--_bt_next
                            |          
                             --33.03%--_bt_steppage
                                       |          
                                       |--32.41%--UnpinBufferNoOwner
                                       |          |          
                                       |           --7.30%--pg_atomic_compare_exchange_u32 (inlined)
                                       |                     pg_atomic_compare_exchange_u32_impl (inlined)
                                       |          
                                        --0.61%--ReleaseBuffer
                                                  UnpinBuffer (inlined)
                                                  BufferDescriptorGetBuffer (inlined)