Messages in this thread | | | Date | Sun, 05 Feb 2006 19:06:51 +0200 | From | Mika Penttilä <> | Subject | Re: [VM PATCH] rotate_reclaimable_page fails frequently |
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Shantanu Goel wrote:
>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 > > >__________________________________________________ > > I think this BUGs easily because shrink_cache doesn't expect to see unfreeable pages put back to LRU.
--Mika
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