From: Dave Hansen <dave@sr71.net>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
mgorman@suse.de, tim.c.chen@linux.intel.com,
Dave Hansen <dave@sr71.net>
Subject: [RFC][PATCH 0/7] mm: Batch page reclamation under shink_page_list
Date: Tue, 07 May 2013 14:19:54 -0700 [thread overview]
Message-ID: <20130507211954.9815F9D1@viggo.jf.intel.com> (raw)
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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next reply other threads:[~2013-05-07 21:19 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-07 21:19 Dave Hansen [this message]
2013-05-07 21:19 ` [RFC][PATCH 1/7] defer clearing of page_private() for swap cache pages Dave Hansen
2013-05-09 22:07 ` Seth Jennings
2013-05-09 22:19 ` Dave Hansen
2013-05-10 9:26 ` Michal Hocko
2013-05-10 14:01 ` Seth Jennings
2013-05-14 14:55 ` Mel Gorman
2013-05-07 21:19 ` [RFC][PATCH 2/7] make 'struct page' and swp_entry_t variants of swapcache_free() Dave Hansen
2013-05-14 15:00 ` Mel Gorman
2013-05-07 21:19 ` [RFC][PATCH 3/7] break up __remove_mapping() Dave Hansen
2013-05-14 15:22 ` Mel Gorman
2013-05-07 21:20 ` [RFC][PATCH 4/7] break out mapping "freepage" code Dave Hansen
2013-05-14 15:26 ` Mel Gorman
2013-05-07 21:20 ` [RFC][PATCH 5/7] create __remove_mapping_batch() Dave Hansen
2013-05-09 22:13 ` Seth Jennings
2013-05-09 22:18 ` Dave Hansen
2013-05-14 15:51 ` Mel Gorman
2013-05-16 17:14 ` Dave Hansen
2013-05-07 21:20 ` [RFC][PATCH 6/7] use __remove_mapping_batch() in shrink_page_list() Dave Hansen
2013-05-14 16:05 ` Mel Gorman
2013-05-14 16:50 ` Dave Hansen
2013-05-07 21:20 ` [RFC][PATCH 7/7] drain batch list during long operations Dave Hansen
2013-05-07 23:56 ` Dave Hansen
2013-05-08 0:42 ` Tim Chen
2013-05-14 16:08 ` Mel Gorman
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