4.6 Compat: Fall back to d_prune_aliases() if necessary #4769
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As of 4.6, the icache and dcache LRUs are memcg aware insofar as the kernel's per-superblock shrinker is concerned. The effect is that dcache or icache entries added by a task in a non-root memcg won't be scanned by the shrinker in the context of the root (or NULL) memcg. This defeats the attempts by zfs_sb_prune() to unpin buffers and can allow metadata to grow uncontrollably. This patch reverts to the d_prune_aliaes() method in case the kernel's per-superblock shrinker is not able to free anything. Fixes: openzfs#4726
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Time to see whether this works for all of the various kernels. |
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Thanks for tacking this, the patch LGTM. I've re-submitted the two failed testers since both failures looked unrelated. |
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Nice. LGTM. |
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@dweeezil let me know if your happy with this as the final patch and I'll merge it. |
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@behlendorf Go for it. |
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Merged as: 09fb30e Linux 4.6 compat: Fall back to d_prune_aliases() if necessary |
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As of 4.6, the icache and dcache LRUs are memcg aware insofar as the
kernel's per-superblock shrinker is concerned. The effect is that dcache
or icache entries added by a task in a non-root memcg won't be scanned
by the shrinker in the context of the root (or NULL) memcg. This defeats
the attempts by zfs_sb_prune() to unpin buffers and can allow metadata to
grow uncontrollably. This patch reverts to the d_prune_aliaes() method
in case the kernel's per-superblock shrinker is not able to free anything.
Fixes: #4726