Re: [PATCH -mm] vmscan: bail out of page reclaim after swap_cluster_maxpages

[Rik van Riel]

KOSAKI Motohiro wrote:

> 1. reclaim 32 page from ZONE_HIGHMEM
> 2. reclaim 32 page from ZONE_NORMAL
> 3. reclaim 32 page from ZONE_DMA
> 4. exit reclaim
> 5. another task call page alloc and it cause try_to_free_pages()
> 6. reclaim 32 page from ZONE_HIGHMEM
> 7. reclaim 32 page from ZONE_NORMAL
> 8. reclaim 32 page from ZONE_DMA

> > - have direct reclaim tasks continue when priority == DEF_PRIORITY
>
> disagreed.
> it cause above bad scenario, I think.

I think I did not explain it clearly.  Let me illustrate
with a new patch.  (one moment :))

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