Messages in this thread | | | Date | Sun, 5 Feb 2006 07:02:59 -0800 (PST) | From | Shantanu Goel <> | Subject | [VM PATCH] rotate_reclaimable_page fails frequently |
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Hi,
It seems rotate_reclaimable_page fails most of the time due the page not being on the LRU when kswapd calls writepage(). The filesystem in my tests is ext3. The attached patch against 2.6.16-rc2 moves the page to the LRU before calling writepage(). Below are results for a write test with:
dd if=/dev/zero of=test bs=1024k count=1024
To trigger the writeback path with the default dirty ratios, I set swappiness to 55 and mapped memory to about 80%.
w/o patch (/proc/sys/vm/wb_put_lru = 0):
pgrotcalls 25852 pgrotnonlru 25834 pgrotated 18
with patch (/proc/sys/vm/wb_put_lru = 1):
pgrotcalls 26616 pgrotated 26616
Thanks, Shantanu
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