On Fri 05 Jun 2015 05:52:29 PM CEST, Max Reitz wrote: >> +Reducing the memory usage >> +------------------------- >> +It is possible to clean unused cache entries in order to reduce the >> +memory usage during periods of low I/O activity. >> + >> +The parameter "cache-clean-interval" defines an interval (in seconds) >> +after which all unused cache entries are removed from memory. >> + >> +This example removes all unused cache entries every 15 minutes: >> + >> + -drive file=hd.qcow2,cache-clean-interval=900 >> + >> +If unset, the default value for this parameter is 0 and it disables >> +this feature. >> + >> +Note that this functionality currently relies on the MADV_DONTNEED >> +argument for madvise() to actually free the memory, so it is not >> +useful in systems that don't follow that behavior. > > I'd like a definition of what "unused" means (I know because of this > series, but I wouldn't know just from this document).
It means that it hasn't been accessed in that interval (because it was not needed). Are you thinking of any other possible interpretation? Berto
