Re: [PATCH v17 0/2] MR3504: ntdll: An implementation of SRWLOCK that closer matches Windows'.

[Yuxuan Shui (＠yshui)]

On Thu Aug 31 12:25:16 2023 +0000, Yuxuan Shui wrote:
> oh my, native SRWLOCK is really really fast. Even when compared to the
> current, no wait list version.
> I noticed with exclusive locks, current SRWLOCK would show >100% CPU
> usage. I think this means there are some spinning going on?
> I see, in current version all threads Waits on the same Address, so the address' futex queue is contended. Threads are spinning on `queue->lock`, so there is a chance for the lock to be released and the threads never actually call `futex` (in this synthetic test anyway).

Whereas with this MR threads are generally waiting on different addresses, so they always enter futex.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/3504#note_43958