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Differential D28682

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

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

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