ARC: Cache arc_c value during arc_evict() #16605
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tkittich
reviewed
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 <mav@FreeBSD.org> 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
behlendorf
approved these changes
Oct 4, 2024
ixhamza
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this pull request
Nov 11, 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. Reviewed-by: Theera K. <tkittich@hotmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes openzfs#16576 Closes openzfs#16605
ptr1337
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Nov 14, 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. Reviewed-by: Theera K. <tkittich@hotmail.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes openzfs#16576 Closes openzfs#16605
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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.