On Mon 15-10-18 13:27:09, Alexander Duyck wrote: > This patch introduces a new iterator for_each_free_mem_pfn_range_in_zone. > > This iterator will take care of making sure a given memory range provided > is in fact contained within a zone. It takes are of all the bounds checking > we were doing in deferred_grow_zone, and deferred_init_memmap. In addition > it should help to speed up the search a bit by iterating until the end of a > range is greater than the start of the zone pfn range, and will exit > completely if the start is beyond the end of the zone. > > This patch adds yet another iterator called > for_each_free_mem_range_in_zone_from and then uses it to support > initializing and freeing pages in groups no larger than MAX_ORDER_NR_PAGES. > By doing this we can greatly improve the cache locality of the pages while > we do several loops over them in the init and freeing process. > > We are able to tighten the loops as a result since we only really need the > checks for first_init_pfn in our first iteration and after that we can > assume that all future values will be greater than this. So I have added a > function called deferred_init_mem_pfn_range_in_zone that primes the > iterators and if it fails we can just exit. Numbers please. Besides that, this adds a lot of code and I am not convinced the result is so much better to justify that. > Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> > --- > include/linux/memblock.h | 58 +++++++++++++++ > mm/memblock.c | 63 ++++++++++++++++ > mm/page_alloc.c | 176 ++++++++++++++++++++++++++++++++-------------- > 3 files changed, 242 insertions(+), 55 deletions(-) -- Michal Hocko SUSE Labs
