zfs: Avoid updating the L2ARC device header unnecessarily
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Authored by mm on Feb 15 2021, 8:15 AM.

Details

Reviewers

freqlabs
mmacy
mjg
delphij

Commits

rG0be7053c91b9: zfs: Avoid updating the L2ARC device header unnecessarily
rGedb9049c3a78: zfs: Avoid updating the L2ARC device header unnecessarily
rG5dce03847fdc: zfs: Avoid updating the L2ARC device header unnecessarily

Summary

From openzfs 0ae184a6baaf71e155e9b19af81b75474622ff58 commit message:

If we do not write any buffers to the cache device and the evict hand
has not advanced do not update the cache device header.

Cherry-picked from openzfs master 0ae184a6b

MFC after: 3 days

This prevents zfs from continously writing to l2arc on an idle system.
Fix relevant for 13.0-RELEASE

Diff Detail

Repository

rG FreeBSD src repository

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Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

mm created this revision.Feb 15 2021, 8:15 AM

Herald added a subscriber: delphij. · View Herald TranscriptFeb 15 2021, 8:15 AM

mm requested review of this revision.Feb 15 2021, 8:15 AM

delphij accepted this revision.Feb 15 2021, 8:25 AM

This revision is now accepted and ready to land.Feb 15 2021, 8:25 AM

Closed by commit rG5dce03847fdc: zfs: Avoid updating the L2ARC device header unnecessarily (authored by mm). · Explain WhyFeb 15 2021, 10:00 AM

This revision was automatically updated to reflect the committed changes.

mm added a commit: rG5dce03847fdc: zfs: Avoid updating the L2ARC device header unnecessarily.

mm added a commit: rGedb9049c3a78: zfs: Avoid updating the L2ARC device header unnecessarily.Feb 18 2021, 1:30 AM

mm added a commit: rG0be7053c91b9: zfs: Avoid updating the L2ARC device header unnecessarily.Feb 18 2021, 9:05 AM

Revision Contents
Changeset List

Path

Size

sys/

contrib/

openzfs/

module/

zfs/

arc.c

4 lines

Diff 83919

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sys/contrib/openzfs/module/zfs/arc.c

zfs: Avoid updating the L2ARC device header unnecessarilyClosedPublicActions