Re: Performance degradation in commit ac1d794 - Mailing list pgsql-hackers

Васильев Дмитрий <d.vasilyev@postgrespro.ru> writes:
> ​ Samples: 1M of event 'cycles', Event count (approx.): 816922259995, UID:
> pgpro
>   Overhead  Shared Object       Symbol

>   69,72%  [kernel]            [k] _raw_spin_lock_irqsave
>   1,43%  postgres            [.] _bt_compare
>    1,19%  postgres            [.] LWLockAcquire
>    0,99%  postgres            [.] hash_search_with_hash_value
>    0,61%  postgres            [.] PinBuffer

Seems like what you've got here is a kernel bug.
        regards, tom lane