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Implement parallel ARC eviction #16486

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Implement parallel ARC eviction #16486

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Commits on Oct 23, 2024

  1. Implement parallel ARC eviction 

    Read and write performance can become limited by the arc_evict
process being single threaded. Additional data cannot be added
to the ARC until sufficient existing data is evicted.

On many-core systems with TBs of RAM, a single thread becomes
a significant bottleneck.

With the change we see a 25% increase in read and write throughput

Sponsored-by: Expensify, Inc.
Sponsored-by: Klara, Inc.
Co-authored-by: Allan Jude <[email protected]>
Co-authored-by: Mateusz Piotrowski <[email protected]>
Signed-off-by: Alexander Stetsenko <[email protected]>
Signed-off-by: Allan Jude <[email protected]>
Signed-off-by: Mateusz Piotrowski <[email protected]>
    @allanjude @0mp
    3 people committed Oct 23, 2024
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Commits on Nov 5, 2024

  1. zfs.4: Incorporate Alexander's feedback 

    - Improve the description of the scaling algorithm in the manual page.

Signed-off-by: Mateusz Piotrowski <[email protected]>
    @0mp
    0mp committed Nov 5, 2024
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Commits on Nov 6, 2024

  1. arc.c: Use highbit64() instead of arc_ilog2()

    @0mp
    0mp committed Nov 6, 2024
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  2. arc: Use ZMOD_RD for zfs_arc_evict_threads 

    This parameter cannot be changed during runtime anyway in any meaningful
way. Make it explicitly read-only.

The manual page does not need to be updated. It already mentions that
the thread count cannot be changed during runtime.
    @0mp
    0mp committed Nov 6, 2024
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  3. arc_evict_state: Remove an unnecessary assert

    @0mp
    0mp committed Nov 6, 2024
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  4. arc: Use taskq_init_ent() instead of memset

    @0mp
    0mp committed Nov 6, 2024
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