Bug #97704 innobase/srv: refine srv0conc with c++11 atomics

Submitted:	20 Nov 2019 9:17	Modified:	1 Sep 2020 15:23
Reporter:	Cai Yibo (OCA)	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S5 (Performance)
Version:	8.0	OS:	Any
Assigned to:		CPU Architecture:	ARM
Tags:	Contribution

Description:
This is followup patch of Bug #96504(Refine atomics and barriers for weak memory order platform).
It depends on the patch for Bug #97150.

"n_waiting" is a counter for adjusting thread sleep delay. Only atomicity is required.
Refine it with C++11 relaxed order.

"n_active" guards threads entering and leaving innodb.
Refine it with acquire/release order.

How to repeat:
N/A

patch (*) I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

Contribution: 0001-innobase-srv-refine-srv0conc.cc-with-c-11-atomics.patch (text/x-patch), 4.25 KiB.

Hello Cai Yibo,

Thank you for the report and contribution.

regards,
Umesh

Posted by developer:
 
Fixed as of the upcoming 8.0.23 release, and here's the proposed changelog entry from the documentation team:

Internal counter variables associated with thread sleep delay and threads
entering an leaving InnoDB were revised to use C++ std::atomic. Built-in
atomic operations were removed. 

 Thanks to Yibo Cai from ARM for the contribution.

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