Extend the hung_task detector test module to include read-write semaphore
support alongside existing mutex and semaphore tests. This module now
creates additional debugfs files under <debugfs>/hung_task, namely
'rw_semaphore_read' and 'rw_semaphore_write', in addition to 'mutex' and
'semaphore'. Reading these files with multiple processes triggers a
prolonged sleep (256 seconds) while holding the respective lock, enabling
hung_task detector testing for various locking mechanisms.
This change builds on the extensible hung_task_tests module, adding
read-write semaphore functionality to improve test coverage for kernel
locking primitives. The implementation ensures proper lock handling and
includes checks to prevent redundant data reads.
Usage is:
> cd /sys/kernel/debug/hung_task
> cat mutex & cat mutex # Test mutex blocking
> cat semaphore & cat semaphore # Test semaphore blocking
> cat rw_semaphore_write \
& cat rw_semaphore_read # Test rwsem blocking
> cat rw_semaphore_write \
& cat rw_semaphore_write # Test rwsem blocking
Update the Kconfig description to reflect the addition of read-write
semaphore debugfs files.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zi Li <[email protected]>
Suggested-by: Masami Hiramatsu (Google) <[email protected]>
Cc: Anna Schumaker <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Joel Granados <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Mingzhe Yang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tomasz Figa <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yongliang Gao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Extend the existing hung_task detector test module to support multiple
lock types, including mutex and semaphore, with room for future additions
(e.g., spinlock, etc.). This module creates dummy files under
<debugfs>/hung_task, such as 'mutex' and 'semaphore'. The read process on
any of these files will sleep for enough long time (256 seconds) while
holding the respective lock. As a result, the second process will wait on
the lock for a prolonged duration and be detected by the hung_task
detector.
This change unifies the previous mutex-only sample into a single,
extensible hung_task_tests module, reducing code duplication and improving
maintainability.
Usage is:
> cd /sys/kernel/debug/hung_task
> cat mutex & cat mutex # Test mutex blocking
> cat semaphore & cat semaphore # Test semaphore blocking
Update the Kconfig description to reflect multiple debugfs files support.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lance Yang <[email protected]>
Signed-off-by: Zi Li <[email protected]>
Suggested-by: Masami Hiramatsu (Google) <[email protected]>
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Cc: Anna Schumaker <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Joel Granados <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Mingzhe Yang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Tomasz Figa <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yongliang Gao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Zi Li