On Wed, 1 Feb 2012 17:41:01 +0300
Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
> "order" is -1 when compacting via /proc/sys/vm/compact_memory. Making
> it unsigned causes a bug in __compact_pgdat() when we test:
>
> if (cc->order < 0 || !compaction_deferred(zone, cc->order))
> compact_zone(zone, cc);
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 382831e..5f80a11 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -35,7 +35,7 @@ struct compact_control {
> unsigned long migrate_pfn; /* isolate_migratepages search base */
> bool sync; /* Synchronous migration */
>
> - unsigned int order; /* order a direct compactor needs */
> + int order; /* order a direct compactor needs */
> int migratetype; /* MOVABLE, RECLAIMABLE etc */
> struct zone *zone;
> };
One would expect this to significantly change the behaviour of
/proc/sys/vm/compact_memory. Enfeebled minds want to know: is
the new behaviour better or worse than the old behaviour?
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