Fixing writeback from direct reclaim
Posted Jul 25, 2010 15:13 UTC (Sun) by giraffedata
In reply to: Fixing writeback from direct reclaim
Parent article: Fixing writeback from direct reclaim
I don't know that there is any noticeable difference in the time it takes to get a page from the free list and the time it takes to steal a clean inactive page not in the free list. But maybe, since it does take a certain number of CPU cycles to forget what used to be in the page.
I believe the only point of a minimum free list size is to provide some reserve for use in contexts where stealing is not possible. In particular, when the page stealer itself needs memory in order to progress, it can't wait for a page steal to get it. I.e. the parameter in question is for adjusting the probability of deadlock and maybe OOM.
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