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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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