Fixing devPrivates

[Keith Packard]

On Thu, 29 Apr 2010 17:34:47 +0300, Tiago Vignatti <tiago.vignatti at nokia.com> wrote:

> I started one standalone Xorg and here are the results:
> 
> - with current devPrivates: 5008 kB
> - with new proposed devPrivates: 5032 kB

I promised to get some actual numbers. I did before/after comparisons
with three different X server states:

 1) X server at the root weave
 2) Gnome session started
 3) Gnome session running with iceweasel showing lwn.net's home page

With the old implementation:

         bytes:   blocks:
Startup: 10516    33 
Gnome:   178776   582
lwn.net: 377492   1131

And with the new implementation:

         bytes:  blocks:
Startup: 1220    35
Gnome:   20992   754
lwn.net: 31312   1529

So, I'm getting somewhere around a 90% raw space savings. It's better
than that though -- each of the blocks in the old implementation
represents at least one additional allocated block of memory, any
pre-requested private storage would be another allocated block of
memory. With the new implementation, there are precisely 2 additional
allocations. That's all.

I think this patch sequence is ready for review now; it is still to be
found at:

git://people.freedesktop.org/~keithp/xserver.git fix-private-usage

-- 
keith.packard at intel.com
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