On Sat 07-09-19 10:25:20, Alexander Duyck wrote: > From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> > > Move the head/tail adding logic out of the shuffle code and into the > __free_one_page function since ultimately that is where it is really > needed anyway. By doing this we should be able to reduce the overhead > and can consolidate all of the list addition bits in one spot. This changelog doesn't really explain why we want this. You are reshuffling the code, allright, but why do we want to reshuffle? Is the result readability a better code reuse or something else? Where does the claimed reduced overhead coming from? >From a quick look buddy_merge_likely looks nicer than the code splat we have. Good. But then > Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> [...] > - if (is_shuffle_order(order)) > - add_to_free_area_random(page, &zone->free_area[order], > - migratetype); > + area = &zone->free_area[order]; > + if (is_shuffle_order(order) ? shuffle_pick_tail() : > + buddy_merge_likely(pfn, buddy_pfn, page, order)) Ouch this is just awful don't you think? -- Michal Hocko SUSE Labs
