lkml.org 
[lkml]   [2002]   [Aug]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: large page patch (fwd) (fwd)

On Fri, 9 Aug 2002, Daniel Phillips wrote:
> >
> > Note that even active defrag won't be able to handle the case where you
> > want have lots of big pages, consituting a large percentage of available
> > memory.
>
> Perhaps I'm missing something, but I don't see why.

The statistics are against you. rmap won't help at all with all the other
kernel allocations, and the dcache/icache is often large, and on big
machines while there may be tens of thousands of idle entries, there will
also be hundreds of _non_idle entries that you can't just remove.

> Slab allocations would not have GFP_DEFRAG (I mistakenly wrote GFP_LARGE
> earlier) and so would be allocated outside ZONE_LARGE.

.. at which poin tyou then get zone balancing problems.

Or we end up with the same kind of special zone that we have _anyway_ in
the current large-page patch, in which case the point of doing this is
what?

Linus

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:27    [W:2.026 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site