Re: [PATCH] 2.6.4-rc2-mm1: vm-split-active-lists

From: Nick Piggin
Date: Fri Mar 12 2004 - 04:40:18 EST

Andrew Morton wrote:

Nick Piggin <piggin@xxxxxxxxxxxxxxx> wrote:

Hmm... I guess it is still smooth because it is swapping out only
inactive pages. If the standard VM isn't being pushed very hard it
doesn't scan mapped pages at all which is why it isn't swapping.

I have a preference for allowing it to scan some mapped pages though.

I haven't looked at the code but if, as I assume, it is always scanning
mapped pages, although at a reduced rate then the effect will be the same
as setting swappiness to 100, except it will take longer.


That effect is to cause the whole world to be swapped out when people
return to their machines in the morning. Once they're swapped back in the
first thing they do it send bitchy emails to you know who.

From a performance perspective it's the right thing to do, but nobody likes

Yeah. I wonder if there is a way to be smarter about dropping these
used once pages without putting pressure on more permanent pages...
I guess all heuristics will fall down somewhere or other.

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