On 02/26/2010 09:32 AM, Johannes Weiner wrote:
On Wed, Feb 24, 2010 at 01:39:46PM -0800, Andrew Morton wrote:
On Mon, 22 Feb 2010 20:49:07 +0100 Johannes Weiner<hannes@xxxxxxxxxxx> wrote:
This patch makes the VM be more careful about activating mapped file
pages in the first place. The minimum granted lifetime without
another memory access becomes an inactive list cycle instead of the
full memory cycle, which is more natural given the mentioned loads.
iirc from a long time ago, the insta-activation of mapped pages was
done because people were getting peeved about having their interactive
applications (X, browser, etc) getting paged out, and bumping the pages
immediately was found to help with this subjective problem.
So it was a latency issue more than a throughput issue. I wouldn't be
surprised if we get some complaints from people for the same reasons as
a result of this patch.
Agreed. Although we now have other things in place to protect them once
they are active (VM_EXEC protection, lazy active list scanning).
You think we'll need VM_EXEC protection on the inactive list
after your changes?
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