Messages in this thread | | | Date | Thu, 30 Apr 2009 17:45:36 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] vmscan: evict use-once pages first (v2) |
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On Thu, 30 Apr 2009 00:20:58 -0700 Elladan <elladan@eskimo.com> wrote:
> > Elladan, does this smaller patch still work as expected? > > Rik, since the third patch doesn't work on 2.6.28 (without disabling a lot of > code), I went ahead and tested this patch. > > The system does seem relatively responsive with this patch for the most part, > with occasional lag. I don't see much evidence at least over the course of a > few minutes that it pages out applications significantly. It seems about > equivalent to the first patch. > > Given Andrew Morton's request that I track the Mapped: field in /proc/meminfo, > I went ahead and did that with this patch built into a kernel. Compared to the > standard Ubuntu kernel, this patch keeps significantly more Mapped memory > around, and it shrinks at a slower rate after the test runs for a while. > Eventually, it seems to reach a steady state. > > For example, with your patch, Mapped will often go for 30 seconds without > changing significantly. Without your patch, it continuously lost about > 500-1000K every 5 seconds, and then jumped up again significantly when I > touched Firefox or other applications. I do see some of that behavior with > your patch too, but it's much less significant.
Were you able to tell whether altering /proc/sys/vm/swappiness appropriately regulated the rate at which the mapped page count decreased?
Thanks.
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