testing new pmap code

Ronald Klop ronald-lists at klop.ws
Fri Aug 8 17:36:54 UTC 2014

On Wed, 23 Jul 2014 18:27:49 +0200, Alan Cox <alc at rice.edu> wrote:

> Folks,
> About a week ago I committed some new pmap code on all architectures,
> including arm.  However, that code isn't "active" until the attached
> patch is committed.  Before I commit this patch, I'd like to ask people
> to test it on arm "classic" and especially v6.  (The v6 pmap changes
> were more complicated.)
> Here is how to test it.  Before you apply the kernel patch, compile and
> run the attached program, mlockall2A.c, in a loop.  Something like this:
> # while ( 1 )
> while? ./mlockall2A
> while? sysctl vm.stats.vm.v_wire_count
> while? sleep 7
> while? end
> You should see the wire count steadily increase, because there is a
> wired page leak.
> Now, apply the kernel patch, and repeat the same test.  This time, the
> wire count should stabilize.
> If you're testing on arm v6, substitute
> sysctl vm.stats.vm.v_wire_count vm.pmap.section
> for
> sysctl vm.stats.vm.v_wire_count
> so that I can verify that we're handling superpages correctly.
> Thanks,
> Alan

I setup my Sheevaplug (armv5?) with 11-CURRENT. Does this need testing  
still? I saw that the patch is already committed. And running the test  
does not crash my machine. The v_wire_count goes up, seems to stabilize  
and after I stop the loop it goes down again.


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