Messages in this thread | | | Date | Tue, 4 Apr 2017 15:07:03 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] mm: vmscan: fix IO/refault regression in cache workingset transition |
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On Tue, 4 Apr 2017 18:00:52 -0400 Johannes Weiner <hannes@cmpxchg.org> wrote:
> Since 59dc76b0d4df ("mm: vmscan: reduce size of inactive file list") > we noticed bigger IO spikes during changes in cache access patterns. > > The patch in question shrunk the inactive list size to leave more room > for the current workingset in the presence of streaming IO. However, > workingset transitions that previously happened on the inactive list > are now pushed out of memory and incur more refaults to complete. > > This patch disables active list protection when refaults are being > observed. This accelerates workingset transitions, and allows more of > the new set to establish itself from memory, without eating into the > ability to protect the established workingset during stable periods. > > Fixes: 59dc76b0d4df ("mm: vmscan: reduce size of inactive file list") > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> > Cc: <stable@vger.kernel.org> # 4.7+
That's a pretty large patch and the problem has been there for a year. I'm not sure that it's 4.11 material, let alone -stable. Care to explain further?
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