Tests

Record the amount of free pages instead of hashmapFreeCount calculation #777

Job	Run time
test-linux (linux-amd64-unit-test-1-cpu)	15m 2s
test-windows (windows-amd64-unit-test-4-cpu)	43m 39s
test-linux (linux-amd64-unit-test-2-cpu)	14m 55s
test-linux (linux-amd64-unit-test-4-cpu)	14m 16s
test-linux (linux-amd64-unit-test-4-cpu-race)	31m 49s
coverage (ubuntu-latest)	14m 29s
coverage (windows-latest)	39m 23s
	2h 53m 33s

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