Re: pre2 swap_out() changes

[Zlatko Calusic <zlatko@iskon.hr>]

Zlatko Calusic <zlatko@iskon.hr> writes:

> Marcelo Tosatti <marcelo@conectiva.com.br> writes:
> 
> > On Sun, 14 Jan 2001, Ed Tomlinson wrote:
> > 
> > > Hi,
> > > 
> > > A couple of observations on the pre2/pre3 vm.  It seems to start swapping out 
> > > very quicky but this does not seem to hurt.  Once there is memory preasure 
> > > and swapin starts cpu utilization drops thru the roof - kernel compiles are 
> > > only able to drive the system at 10-20% (UP instead of 95-100%).  Once the 
> > > system stops swapping (in) there are some side effects.  Closing windows 
> > > in X becomes jerky (ie you see blocks get cleared and refreshed).  If little 
> > > or no swapping has occured X is much faster.
> > > 
> > > With the patch marcelo posted last night things change.  Now It can use cpu 
> > > when swapping.  It does seem to start swaping (in and out) faster but the 
> > > system remains more interactive than above.  I still see the X effect though.
> > > 
> > > Over all I think 2.4.0+marcelo's first patch(es) was fastest.
> > 
> 
> My opinion exactly, Ed! Don't let me copy/paste all of your comment as
> mine just beacuse your English is better. :)
> 
> > There is still a critical thing to be fixed which is the swapout selection
> > path (which is probably what is causing your problem in X)
> > 
> 
> Yes, while swapout code in pre3 is much cleaner and nicer to see, but
> it has problems with deciding what to swap out, and streaming it all
> well. Glad we agree. Will check your new patch now, to see if it helps.

With your last patch applied:

Kernel compilation is back to normal, under 4 minutes! Very good!

Memory hogger's behaviour haven't changed at all, for that problem to
solve we will need some major changes in the swap_out() and functions
it calls, I'm afraid.
-- 
Zlatko
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux.eu.org/Linux-MM/