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
