Re: [patch] mm, compaction: periodically schedule when freeing pages

[Rik van Riel]

On 09/04/2013 07:25 PM, David Rientjes wrote:
> We've been getting warnings about an excessive amount of time spent
> allocating pages for migration during memory compaction without
> scheduling.  isolate_freepages_block() already periodically checks for
> contended locks or the need to schedule, but isolate_freepages() never
> does.
> 
> When a zone is massively long and no suitable targets can be found, this
> iteration can be quite expensive without ever doing cond_resched().
> 
> Check periodically for the need to reschedule while the compaction free
> scanner iterates.
> 
> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>

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

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