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zfs: spa: ZIO_TASKQ_ISSUE: Use symbolic priority

Description

zfs: spa: ZIO_TASKQ_ISSUE: Use symbolic priority

This allows to change the meaning of priority differences in FreeBSD
without requiring code changes in ZFS.

MFC after: 1 month
Event: Kitchener-Waterloo Hackathon 202506
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D45390

(cherry picked from commit fd141584cf89d7d24543ef5be83c6927a5d67ffa)

Details

Provenance
olceAuthored on May 21 2024, 2:23 PM
Differential Revision
D45390: runq/sched: Switch to 256 distinct levels
Parents
rG79dcda3d5df6: Internal scheduling priorities: Always use symbolic ones
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