Re: [CFT][PATCH] smoother VM for -ac

From: Benjamin LaHaise (
Date: Wed Oct 10 2001 - 15:48:23 EST

On Wed, Oct 10, 2001 at 05:25:30PM -0300, Rik van Riel wrote:
> 4) in page_alloc.c, the "slowdown" reschedule has been
> made stronger by turning it into a try_to_free_pages(),
> under memory load, this results in allocators calling
> try_to_free_pages() when the amount of work to be done
> isn't too bad yet and pretty much guarantees them they'll
> get to do their allocation immediately afterwards ...
> statistics make sure that the memory hogs are slowed down
> much more than well-behaved programs

There's a small problem with this one: I know that during testing of
earlier 2.4 kernels we saw a livelock which was caused by the vm
subsystem spinning without scheduling. This can happen in a couple of
cases like NFS where another task has to be allowed to run in order to
make progress in clearing pages.

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This archive was generated by hypermail 2b29 : Mon Oct 15 2001 - 21:00:34 EST