ARC: Cache arc_c value during arc_evict() #16605
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tkittich
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Oct 4, 2024
Since arc_evict() run can take some time, arc_c change during it may result in undesired shift in ARC states balance. Primarily in case of arc_c reduction it may cause eviction from MFU data state despite its being below the target already. Instead we should evict as originally planned and if needed do another round after. Fixes: openzfs#16576 Signed-off-by: Alexander Motin <[email protected]> Sponsored by: iXsystems, Inc.
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@tkittich Thanks. It was a mismerge during commit, I had it my tree. :( |
gmelikov
approved these changes
Oct 4, 2024
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Since arc_evict() run can take some time, arc_c change during it may result in undesired shift in ARC states balance. Primarily in case of arc_c reduction it may cause eviction from MFU data state despite its being below the target already. Instead we should evict as originally planned and if needed do another round after.
Fixes: #16576
How Has This Been Tested?
By @tkittich in #16576.
Types of changes
Checklist:
Signed-off-by.