lkml.org 
[lkml]   [2004]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: NUMA API for Linux
Hugh Dickins <hugh@veritas.com> wrote:
>
> On Wed, 7 Apr 2004, Andrew Morton wrote:
> >
> > Your patch takes the CONFIG_NUMA vma from 64 bytes to 68. It would be nice
> > to pull those 4 bytes back somehow.
>
> How significant is this vma size issue?

For some workloads/machines it will simply cause an
approximately-proportional reduction in the size of the workload which we
can handle.

ie: there are some (oracle) workloads where the kernel craps out due to
lowmem vma exhaustion. If they're now using remap_file_pages() for this then
it may not be a problem any more. Ingo would know better than I.

> anon_vma objrmap will add 20 bytes to each vma (on 32-bit arches):
> 8 for prio_tree, 12 for anon_vma linkage in vma,
> sometimes another 12 for the anon_vma head itself.
>
> anonmm objrmap adds just the 8 bytes for prio_tree,
> remaining overhead 28 bytes per mm.
>
> Seems hard on Andi to begrudge him 4.

-
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 14:02    [W:0.088 / U:0.536 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site