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Gmane
From: Dave Hansen <dave <at> sr71.net>
Subject: [RFC][PATCH 0/7] mm: Batch page reclamation under shink_page_list
Newsgroups: gmane.linux.kernel
Date: Tuesday 7th May 2013 21:19:54 UTC (over 3 years ago)
These are an update of Tim Chen's earlier work:

	http:[email protected]

I broke the patches up a bit more, and tried to incorporate some
changes based on some feedback from Mel and Andrew.

--

To do page reclamation in shrink_page_list function, there are
two locks taken on a page by page basis.  One is the tree lock
protecting the radix tree of the page mapping and the other is
the mapping->i_mmap_mutex protecting the mapped pages.  This set
deals only with mapping->tree_lock.

Tim managed to get 14% throughput improvement when with a workload
putting heavy pressure of page cache by reading many large mmaped
files simultaneously on a 8 socket Westmere server.

I've been testing these by running large parallel kernel compiles
on systems that are under memory pressure.  During development,
I caught quite a few races on smaller setups, and it's being
quite stable that large (160 logical CPU / 1TB) system.

--
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