This is the second version of the patch series. Thanks to Matthew Wilcox for many valuable suggestions on improving the patches. 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. I try to batch the operations on pages sharing the same lock to reduce lock contentions. The first patch batch the operations protected by tree lock while the second and third patch batch the operations protected by the i_mmap_mutex. I 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. Tim Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> --- Diffstat include/linux/rmap.h | 8 +++- mm/rmap.c | 110 ++++++++++++++++++++++++++++++++++--------------- mm/vmscan.c | 113 +++++++++++++++++++++++++++++++++++++++++++++----- 3 files changed, 185 insertions(+), 46 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>