[GitHub] [incubator-nuttx] zyfeier opened a new pull request, #6987: nuttx/sched: semaphore and mqueue task list optimize

[GitBox]

zyfeier opened a new pull request, #6987:
URL: https://github.com/apache/incubator-nuttx/pull/6987

   ## Summary
   
   Add CONFIG_TASK_LIST_OPTIMIZE feature to improve sem and mqueue performance.
   1.  move waitingforsemaphore list to sem_s；
   2.  move waitingformqnotempty and waitingformqnotfull list to mqueue_inode_s;
   
   ## Impact
   
   Code Size:
   
   Before:
   ```
      text         data     bss     dec     hex filename
    109692          224   24940  134856   20ec8 nuttx
   ```
   
   After:
   Disable CONFIG_TASK_LIST_OPTIMIZE
   ```
      text         data     bss     dec     hex filename
    109732          224   24940  134896   20ef0 nuttx
   ```
   Enable CONFIG_TASK_LIST_OPTIMIZE
   ```
      text         data     bss     dec     hex filename
    109924          312   25144  135380   210d4 nuttx
   ```
   
   Performance:
   
   20 semaphore and 20 threads with different priorities.
   sem_post -> sem_wait (cycle count):
   before:
   `8179`
   
   after:
   `6988`
   
   ## Testing
   
   sabre-6quad:nsh


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