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On systems with enormous amounts of memory, the single arc_evict thread can become a bottleneck if reads and writes are stuck behind it, waiting for old data to be evicted before new data can take its place. This commit adds support for evicting from multiple ARC lists in parallel, by farming the evict work out to some number of threads and then accumulating their results. A new tuneable, zfs_arc_evict_threads, sets the number of threads. By default, it will scale based on the number of CPUs. Sponsored-by: Expensify, Inc. Sponsored-by: Klara, Inc. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Youzhong Yang <youzhong@gmail.com> Signed-off-by: Allan Jude <allan@klarasystems.com> Signed-off-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com> Signed-off-by: Alexander Stetsenko <alex.stetsenko@klarasystems.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Co-authored-by: Rob Norris <rob.norris@klarasystems.com> Co-authored-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com> Co-authored-by: Alexander Stetsenko <alex.stetsenko@klarasystems.com> Closes #16486 |
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