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scylladb/test
Avi Kivity 8785dd62cb tests: use kernel page cache
Tests are short-lived and use a small amount of data. They
are also often run repeatly, and the data is deleted immediately
after the test. This is a good scenario for using the kernel page
cache, as it can cache read-only data from test to test, and avoid
spilling write data to disk if it is deleted quickly.

Acknowledge this by using the new --kernel-page-cache option for
tests.

This is expected to help on large machines, where the disk can be
overloaded. Smaller machines with NVMe disks probably will not see
a difference.

Closes #8347
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