From: Johannes Weiner <hannes@cmpxchg.org>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>, Minchan Kim <minchan@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation
Date: Wed, 13 Jul 2016 09:15:55 -0400 [thread overview]
Message-ID: <20160713131555.GE9905@cmpxchg.org> (raw)
In-Reply-To: <1468404004-5085-4-git-send-email-mgorman@techsingularity.net>
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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next prev parent reply other threads:[~2016-07-13 13:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 10:00 [PATCH 0/4] Follow-up fixes to node-lru series v1 Mel Gorman
2016-07-13 10:00 ` [PATCH 1/4] mm, vmscan: Have kswapd reclaim from all zones if reclaiming and buffer_heads_over_limit -fix Mel Gorman
2016-07-13 13:10 ` Johannes Weiner
2016-07-14 1:22 ` Minchan Kim
2016-07-13 10:00 ` [PATCH 2/4] mm: vmstat: account per-zone stalls and pages skipped during reclaim -fix Mel Gorman
2016-07-13 13:10 ` Johannes Weiner
2016-07-14 14:45 ` Vlastimil Babka
2016-07-13 10:00 ` [PATCH 3/4] mm, page_alloc: fix dirtyable highmem calculation Mel Gorman
2016-07-13 13:15 ` Johannes Weiner [this message]
2016-07-14 15:22 ` Vlastimil Babka
2016-07-13 10:00 ` [PATCH 4/4] mm: move most file-based accounting to the node -fix Mel Gorman
2016-07-13 13:16 ` Johannes Weiner
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