Thor Lancelot Simon <tls%panix.com@localhost> writes: > On Tue, Mar 19, 2013 at 04:05:25PM -0400, Greg Troxel wrote: >> >> This is perhaps overly complex, but it seems like all of the drain >> routines need some sort of "how hard" parameter, because freeing cached >> objects that haven't been accessed in 1000s doesn't really hurt, and as >> you bring the stale lifetime down to 0s it begins to hurt more and be >> thrashing. So maybe that parameter really is in seconds. This seems >> consistent with the intent in the Bonwick paper, which does not explain >> the strategy behind the back-end freeing mechanism (pool_drain, in our >> terms). > > I think pools should be (slightly) leaky buckets. So do you mean that pools should free a page every so often if it's available, so that a pool's usage of unallocated pages decays as e^-(t/60s), or something like that?
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