Messages in this thread | | | Subject | Re: [RFC PATCH v19 0/8] mm: security: ro protection for dynamic data | From | Igor Stoppa <> | Date | Thu, 15 Mar 2018 15:43:49 +0200 |
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On 14/03/2018 19:33, Matthew Wilcox wrote: > On Wed, Mar 14, 2018 at 06:11:22PM +0200, Igor Stoppa wrote:
[...]
>> Probably page_frag does well with relatively large allocations, while >> genalloc seems to be better for small (few allocation units) allocations. > > I don't understand why you would think that. If you allocate 4096 1-byte > elements, page_frag will just use up a page. Doing the same thing with > genalloc requires allocating two bits per byte (1kB of bitmap), plus > other overheads.
I had misunderstood the amount of page_frag structures needed.
-- igor
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