Make spl_kmem_cache size check consistent #15757
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On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsitency. Signed-off-by: Youzhong Yang <yyang@mathworks.com>
behlendorf
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Jan 12, 2024
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
behlendorf
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Status: Accepted
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Just FYI - I've done stress testing with the limit raised to 2M, no issue has been observed, but I didn't get a chance to do performance testing. One caveat - in crash kernel mode, zfs crashes as it fails to create ddt_cache of size 24840. This is most likely a bug in Linux slub allocator which only happens in that mode (single cpu core?) and I will dig deeper when time permits. Anyway, this change does no harm. |
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On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsistency. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Youzhong Yang <yyang@mathworks.com> Closes openzfs#15757
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On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsistency. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Youzhong Yang <yyang@mathworks.com> Closes #15757
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On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsistency. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Youzhong Yang <yyang@mathworks.com> Closes openzfs#15757
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On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsistency. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Youzhong Yang <yyang@mathworks.com> Closes openzfs#15757
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Define spl_kmem_cache_slab_limit to be SPL_MAX_KMEM_ORDER_NR_PAGES * PAGE_SIZE (16K on x86_64).
Motivation and Context
On Linux x86_64, kmem cache can have size up to 4M, however increasing spl_kmem_cache_slab_limit can lead to crash due to the size check inconsitency.
Description
How Has This Been Tested?
Built and tested on a VM in-house.
Types of changes
Checklist:
Signed-off-by.