JDK-8272480 : Remove Mutex::access rank
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 18
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2021-08-14
  • Updated: 2021-09-02
  • Resolved: 2021-08-27
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JDK 18
18 b13Fixed
Related Reports
Blocks :  
JDK-8221360 - Eliminate Shared_DirtyCardQ_lock
Blocks :  
JDK-8272447 - Remove 'native' ranked Mutex
Relates :  
JDK-8214315 - G1: fatal error: acquiring lock SATB_Q_FL_lock/1 out of order with lock tty_lock/0
Description
After JDK-8221360, there are no Mutexes directly using the Mutex::access rank, allowing that rank to be removed.  This may also allow removal of the Mutex::tty rank, reverting the tty_lock back to Mutex::event rank.  That is, effectively undoing some of JDK-8214315.
Comments
Changeset: b92214a8 Author: Coleen Phillimore <coleenp@openjdk.org> Date: 2021-08-27 13:51:39 +0000 URL: https://git.openjdk.java.net/jdk/commit/b92214a8d0ca6ed2a51e4286c258b4ddd0ca3a51
27-08-2021
Fixing this changes the same lines as JDK-8272447 so no point doing this yet. And the comments desperately need updating. Also there should be a special rank for stack_watermark_lock rather than tty-2.
24-08-2021