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What does the stack high water mark indicate in FreeRTOS?

easy📝 Conceptual Q11 of 15
FreeRTOS - Debugging and Monitoring

What does the stack high water mark indicate in FreeRTOS?

AThe total stack size allocated to a task
BThe minimum amount of free stack space a task has had
CThe maximum CPU usage of a task
DThe number of tasks currently running
Step-by-Step Solution
Solution:

  1. Step 1: Understand stack high water mark meaning

    The stack high water mark shows the smallest amount of unused stack space a task has had since it started.

  2. Step 2: Compare with other options

    Other options describe CPU usage, total stack size, or task count, which are unrelated to stack high water mark.

  3. Final Answer:

    The minimum amount of free stack space a task has had -> Option B

  4. Quick Check:

    Stack high water mark = minimum free stack space [OK]
Quick Trick: Remember: 'high water mark' means lowest free stack left [OK]
Common Mistakes:
  • Confusing stack size with stack usage
  • Thinking it measures CPU or task count
  • Assuming it shows maximum stack used

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