Joe Thornber b155aa0e5a
dm cache policy mq: tweak algorithm that decides when to promote a block ...
Rather than maintaining a separate promote_threshold variable that we
periodically update we now use the hit count of the oldest clean
block. Also add a fudge factor to discourage demoting dirty blocks.
With some tests this has a sizeable difference, because the old code
was too eager to demote blocks. For example, device-mapper-test-suite's
git_extract_cache_quick test goes from taking 190 seconds, to 142
(linear on spindle takes 250).
Signed-off-by: Joe Thornber <ejt@redhat.com >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
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b155aa0e5a