linux-kernel - [RFC][PATCH 0/7] mm: Batch page reclamation under shink_page

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Message-Id: <20130507211954.9815F9D1@viggo.jf.intel.com>
Date:	Tue, 07 May 2013 14:19:54 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mgorman@...e.de, tim.c.chen@...ux.intel.com,
	Dave Hansen <dave@...1.net>
Subject: [RFC][PATCH 0/7] mm: Batch page reclamation under shink_page_list

These are an update of Tim Chen's earlier work:

	http://lkml.kernel.org/r/1347293960.9977.70.camel@schen9-DESK

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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