lkml.org 
[lkml]   [2006]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [patch 00/14] remap_file_pages protection support
From
Date

> This will be useful since the VMA lookup at fault time can be a bottleneck for
> some programs (I've received a report about this from Ulrich Drepper and I've
> been told that also Val Henson from Intel is interested about this).

I've not seen much of this if any at all, the various caches that are in
place for these lookups seem to function quite well; what we did see was
glibc's malloc implementation being mistuned resulting in far too many
mmaps than needed (which in turn leads to far too much page zeroing
which is the really expensive part. It's not the vma lookup that is
expensive, it's the page zeroing)

-
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: 2006-05-02 12:23    [W:0.177 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site