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a710866235
This unit test checks that the semaphore doesn't get into a deadlock
when contended, in the presence of many memory-only reads (that don't
wait for admission). This is tested by simulating the 3 kind of reads we
currently have in the system:
* memory-only: reads that don't pass admission and only own memory.
* admitted: reads that pass admission.
* evictable: admitted reads that are furthermore evictable.
The test creates and runs a large number of these reads in parallel,
read kinds being selected randomly, then creates a watchdog which
kills the test if no progress is being made.
(cherry picked from commit 45d580f056)