Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH v4 4/7] Reclaim invalidated page ASAP | Date | Wed, 8 Dec 2010 17:04:34 +0900 (JST) |
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> invalidate_mapping_pages is very big hint to reclaimer. > It means user doesn't want to use the page any more. > So in order to prevent working set page eviction, this patch > move the page into tail of inactive list by PG_reclaim. > > Please, remember that pages in inactive list are working set > as well as active list. If we don't move pages into inactive list's > tail, pages near by tail of inactive list can be evicted although > we have a big clue about useless pages. It's totally bad. > > Now PG_readahead/PG_reclaim is shared. > fe3cba17 added ClearPageReclaim into clear_page_dirty_for_io for > preventing fast reclaiming readahead marker page. > > In this series, PG_reclaim is used by invalidated page, too. > If VM find the page is invalidated and it's dirty, it sets PG_reclaim > to reclaim asap. Then, when the dirty page will be writeback, > clear_page_dirty_for_io will clear PG_reclaim unconditionally. > It disturbs this serie's goal. > > I think it's okay to clear PG_readahead when the page is dirty, not > writeback time. So this patch moves ClearPageReadahead. > > Signed-off-by: Minchan Kim <minchan.kim@gmail.com> > Acked-by: Rik van Riel <riel@redhat.com> > Acked-by: Mel Gorman <mel@csn.ul.ie> > Cc: Wu Fengguang <fengguang.wu@intel.com> > Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > Cc: Johannes Weiner <hannes@cmpxchg.org> > Cc: Nick Piggin <npiggin@kernel.dk>
Until anyone should data, I will not ack this. This patch increase VM state, but benefit is doubious.
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