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Re: [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation

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On Wed, Jul 13, 2016 at 11:00:03AM +0100, Mel Gorman wrote:
> From: Minchan Kim <minchan@kernel.org>
> 
> Note from Mel: This may optionally be considered a fix to the mmotm patch
> 	mm-page_alloc-consider-dirtyable-memory-in-terms-of-nodes.patch
> 	but if so, please preserve credit for Minchan.
> 
> 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>
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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[PATCH 0/4] Follow-up fixes to node-lru series v1 Mel Gorman <mgorman@techsingularity.net> - 2016-07-13 12:10 +0200
  [PATCH 2/4] mm: vmstat: account per-zone stalls and pages skipped during reclaim -fix Mel Gorman <mgorman@techsingularity.net> - 2016-07-13 12:10 +0200
    Re: [PATCH 2/4] mm: vmstat: account per-zone stalls and pages  skipped during reclaim -fix Johannes Weiner <hannes@cmpxchg.org> - 2016-07-13 15:20 +0200
    Re: [PATCH 2/4] mm: vmstat: account per-zone stalls and pages skipped  during reclaim -fix Vlastimil Babka <vbabka@suse.cz> - 2016-07-14 16:50 +0200
  [PATCH 1/4] mm, vmscan: Have kswapd reclaim from all zones if reclaiming and buffer_heads_over_limit -fix Mel Gorman <mgorman@techsingularity.net> - 2016-07-13 12:10 +0200
    Re: [PATCH 1/4] mm, vmscan: Have kswapd reclaim from all zones if  reclaiming and buffer_heads_over_limit -fix Johannes Weiner <hannes@cmpxchg.org> - 2016-07-13 15:20 +0200
    Re: [PATCH 1/4] mm, vmscan: Have kswapd reclaim from all zones if  reclaiming and buffer_heads_over_limit -fix Minchan Kim <minchan@kernel.org> - 2016-07-14 03:30 +0200
  [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation Mel Gorman <mgorman@techsingularity.net> - 2016-07-13 12:10 +0200
    Re: [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation Johannes Weiner <hannes@cmpxchg.org> - 2016-07-13 15:20 +0200
    Re: [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation Vlastimil Babka <vbabka@suse.cz> - 2016-07-14 17:30 +0200
  [PATCH 4/4] mm: move most file-based accounting to the node -fix Mel Gorman <mgorman@techsingularity.net> - 2016-07-13 12:10 +0200
    Re: [PATCH 4/4] mm: move most file-based accounting to the node -fix Johannes Weiner <hannes@cmpxchg.org> - 2016-07-13 15:20 +0200

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