On Thu, Dec 17, 2015 at 9:33 PM, Aleksander Alekseev <
a.aleks...@postgrespro.ru> wrote:
> > It'd really like to see it being replaced by a queuing lock
> > (i.e. lwlock) before we go there. And then maybe partition the
> > freelist, and make nentries an atomic.
> I believe I just implemented something like this (see attachment). The
> idea is to partition PROCLOCK hash table manually into NUM_LOCK_
> PARTITIONS smaller and non-partitioned hash tables. Since these tables
> are non-partitioned spinlock is not used and there is no lock
> contention.

This idea can improve the situation with ProcLock hash table, but I
think IIUC what Andres is suggesting would reduce the contention
around dynahash freelist and can be helpful in many more situations
including BufMapping locks.

With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

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