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SubjectRe: [PATCH] mm: fix calculation accounting dirtyable highmem
On Wed, Jul 13, 2016 at 11:23:13AM +0900, Minchan Kim wrote:
> When I tested vmscale in mmtest in 32bit, I found the benchmark
> was slow down 0.5 times.
>
> base node
> 1 global-1
> User 12.98 16.04
> System 147.61 166.42
> Elapsed 26.48 38.08
>
> With vmstat, I found IO wait avg is much increased compared to
> base.
>
> The reason was highmem_dirtyable_memory accumulates free pages
> and highmem_file_pages from HIGHMEM to MOVABLE zones which was
> wrong. With that, dirth_thresh in throtlle_vm_write is always
> 0 so that it calls congestion_wait frequently if writeback
> starts.
>
> With this patch, it is much recovered.
>
> base node fi
> 1 global-1 fix
> User 12.98 16.04 13.78
> System 147.61 166.42 143.92
> Elapsed 26.48 38.08 29.64
>
> Signed-off-by: Minchan Kim <minchan@kernel.org>

Thanks. I'll pick this up and send a follow-on series to Andrew with
this included.

--
Mel Gorman
SUSE Labs

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