Messages in this thread | | | Date | Mon, 26 Nov 2018 00:02:13 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH v2 0/3] iommu/io-pgtable-arm-v7s: Use DMA32 zone for page tables |
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On Fri, Nov 23, 2018 at 01:23:41PM +0100, Vlastimil Babka wrote: > Is this also true for caches created by kmem_cache_create(), that > debugging options can result in not respecting the alignment passed to > kmem_cache_create()? That would be rather bad, IMHO.
That's what I understood in the discussion. If not it would make our live simpler, but would need to be well document.
Christoph can probably explain the alignment choices in slub.
> > > But I do agree with the sentiment of not wanting to spread GFP_DMA32 > > futher into the slab allocator. > > I don't see a problem with GFP_DMA32 for custom caches. Generic > kmalloc() would be worse, since it would have to create a new array of > kmalloc caches. But that's already ruled out due to the alignment.
True, purely slab probably isn't too bad.
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