Re: [PATCH v1] [mm] Set page->slab_cache for every page allocated for a kmem_cache.

[Alexander Potapenko]

On Fri, May 27, 2016 at 7:30 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> On Fri, 27 May 2016, Alexander Potapenko wrote:
>
>> It's reasonable to rely on the fact that for every page allocated for a
>> kmem_cache the |slab_cache| field points to that cache. Without that it's
>> hard to figure out which cache does an allocated object belong to.
>
> The flags are set only in the head page of a coumpound page which is used
> by SLAB. No need to do this. This would just mean unnecessarily dirtying
> struct page cachelines on allocation.
>

Got it, thank you.
Looks like I just need to make sure my code uses
virt_to_head_page()->page_slab to get the cache for an object.

-- 
Alexander Potapenko
Software Engineer

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