Messages in this thread | | | Date | Mon, 15 Dec 2014 08:16:00 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [PATCH 3/7] slub: Do not use c->page on free |
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On Mon, 15 Dec 2014, Joonsoo Kim wrote:
> > +static bool same_slab_page(struct kmem_cache *s, struct page *page, void *p) > > +{ > > + long d = p - page->address; > > + > > + return d > 0 && d < (1 << MAX_ORDER) && d < (compound_order(page) << PAGE_SHIFT); > > +} > > + > > Somtimes, compound_order() induces one more cacheline access, because > compound_order() access second struct page in order to get order. Is there > any way to remove this?
I already have code there to avoid the access if its within a MAX_ORDER page. We could probably go for a smaller setting there. PAGE_COSTLY_ORDER?
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