Re: [PATCH] mm/compaction: reset compaction scanner positions

[Gioh Kim]

2015-03-24 ìì 8:16ì David Rientjes ì(ê) ì ê:
> On Sat, 21 Mar 2015, Gioh Kim wrote:
>
> > When the compaction is activated via /proc/sys/vm/compact_memory
> > it would better scan the whole zone.
> > And some platform, for instance ARM, has the start_pfn of a zone is zero.
> > Therefore the first try to compaction via /proc doesn't work.
> > It needs to force to reset compaction scanner position at first.
> >
> > Signed-off-by: Gioh Kim <gioh.kim@xxxxx>
>
> That shouldn't be a valid email address.

It's my fault. I'm going to send patch again.

> > Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
>
> Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
>
> I was thinking that maybe this would be better handled as part of the
> comapct_zone() logic, i.e. set cc->free_pfn and cc->migrate_pfn based on a
> helper function that understands cc->order == -1 should compact the entire
> zone.  However, after scanning the entire zone as a result of this write,
> the existing cached pfns probably don't matter anymore.  So this seems
> fine.
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