Linux: Make zfs_prune() fair on NUMA systems #16397
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Previous code evicted nr_to_scan items from each NUMA node. This not only multiplied the eviction by the number of nodes, but could exhaust the smaller ones, evicting inodes used by acive workload and requiring their immediate recreation. This patch spreads the requested eviction between all NUMA nodes proportionally to their evictable counts, which should be closer to expected LRU logic. See kernel's super_cache_scan() as a similar logic example. Signed-off-by: Alexander Motin <[email protected]> Sponsored by: iXsystems, Inc.
ixhamza
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Aug 2, 2024
behlendorf
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Aug 8, 2024
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Status: Accepted
lundman
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Sep 4, 2024
Previous code evicted nr_to_scan items from each NUMA node. This not only multiplied the eviction by the number of nodes, but could exhaust the smaller ones, evicting inodes used by acive workload and requiring their immediate recreation. This patch spreads the requested eviction between all NUMA nodes proportionally to their evictable counts, which should be closer to expected LRU logic. See kernel's super_cache_scan() as a similar logic example. Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Ameer Hamza <[email protected]> Signed-off-by: Alexander Motin <[email protected]> Sponsored by: iXsystems, Inc. Closes openzfs#16397
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Previous code evicted nr_to_scan items from each NUMA node. This not only multiplied the eviction by the number of nodes, but could exhaust the smaller ones, evicting inodes used by active workload and requiring their immediate recreation. This patch spreads the requested eviction between all NUMA nodes proportionally to their evictable counts, which should be closer to expected LRU logic. See kernel's super_cache_scan() as a similar logic example.
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