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Date: Mon, 21 Nov 2011 12:16:49 -0500 From: Rik van Riel <riel@...hat.com> To: Mel Gorman <mgorman@...e.de> CC: Linux-MM <linux-mm@...ck.org>, Andrea Arcangeli <aarcange@...hat.com>, Minchan Kim <minchan.kim@...il.com>, Jan Kara <jack@...e.cz>, Andy Isaacson <adi@...apodia.org>, Johannes Weiner <jweiner@...hat.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/5] mm: compaction: Allow compaction to isolate dirty pages On 11/18/2011 11:58 AM, Mel Gorman wrote: > Commit [39deaf85: mm: compaction: make isolate_lru_page() filter-aware] > noted that compaction does not migrate dirty or writeback pages and > that is was meaningless to pick the page and re-add it to the LRU list. > > What was missed during review is that asynchronous migration moves > dirty pages if their ->migratepage callback is migrate_page() because > these can be moved without blocking. This potentially impacted > hugepage allocation success rates by a factor depending on how many > dirty pages are in the system. > > This patch partially reverts 39deaf85 to allow migration to isolate > dirty pages again. This increases how much compaction disrupts the > LRU but that is addressed later in the series. > > Signed-off-by: Mel Gorman<mgorman@...e.de> Reviewed-by: Rik van Riel <riel@...hat.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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