Messages in this thread |  | | Subject | Re: /proc/sys/vm/freepages not writable. | Date | Sun, 17 Sep 2000 14:44:46 -0500 | From | Evan Jeffrey <> |
| |
> > 1. The inactive_target is 1 second worth of allocations, minus > > the amount of frees in 1 second, averaged over a minute > > So it cannot take load bursts. That's ok for a default, but for special loads > it would be good if there was a way for the administrator to overwrite that, > similar to the old freepages.
How about taking a decaying average (loadavg style) of the peak allocation-free rate on a minute-by-minute basis. Then make the number of seconds at that rate to use as the inactive_target a tunable parameter. That way, a user could, if necessary, tune based on their expected type of load (length of load bursts), and the alg. would tune to the load level (height of those bursts). For a consistent load, peak rate ~= avg. rate, and this decays to the current behavior, except that the "1 second of allocations" is tunable.
I haven't actually looked at the code, so I don't know how easy/hard this is to implement, and while it does reintroduce a tuning parameter, it should be needed less often, and has a much more user-meaningful value (burst length) than # of free pages to keep handy, which depends on the code, and could change between versions.
Evan --- Fear is the mind killer. -- Frank Herbert, "Dune" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |