Hi,
On 2025-06-02 21:20:33 +0300, Yura Sokolov wrote:
> But still problem of spin lock contention is here.
I still would like to see a reproducer for this.
> So I propose to introduce another spin lock type capable for Exclusive and
> Shared lock modes (i.e. Write/Read modes) and use it in this two places.
I am vehemently opposed to that. We should work towards getting rid of
spinlocks, not introduce more versions of spinlocks. Userspace spinlocks
largely are a bad idea. We should instead make properly queued locks cheaper
(e.g. by having an exclusive-only lock, which can be cheaper to release on
common platforms).
Greetings,
Andres Freund