On Thu, 2010-06-10 at 19:55 +0530, Balbir Singh wrote: > > I'm not sure victimizing unmapped cache pages is a good idea. > > Shouldn't page selection use the LRU for recency information instead > > of the cost of guest reclaim? Dropping a frequently used unmapped > > cache page can be more expensive than dropping an unused text page > > that was loaded as part of some executable's initialization and > > forgotten. > > We victimize the unmapped cache only if it is unused (in LRU order). > We don't force the issue too much. We also have free slab cache to go > after. Just to be clear, let's say we have a mapped page (say of /sbin/init) that's been unreferenced since _just_ after the system booted. We also have an unmapped page cache page of a file often used at runtime, say one from /etc/resolv.conf or /etc/passwd. Which page will be preferred for eviction with this patch set? -- Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>