Re: [PATCH 1/5] mm: compaction: Allow compaction to isolate dirtypages

[Rik van Riel]

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@xxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/