lkml.org 
[lkml]   [2006]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH ] VMSPLIT config options (with default config fixed)
On Mon, Feb 06, 2006 at 03:56:34PM +0100, Jan Engelhardt wrote:
> >> >> What userspace programs do depend on it?
> >> >
> >> >there is a lot of userspace that assumes they can do 2Gb or even close
> >> >to 3Gb of memory allocations. Databases, java, basically anything with
> >> >threads. Sure for most of these its a configuration option to reduce
> >> >this, but that still doesn't mean it's a good idea to change from the
> >> >existing behavior...
> >> >
> >> Not to mention that these (almost(*)) fail anyway when you have less than 2
> >> GB of RAM.
> >
> >it's not really overcommit... it can also be file mmaps or shared mmaps
> >of say tmpfs files (the later is common with oracle actually)
>
> So, just as I did in the sample patch, the manual split shall depend on
> EMBEDDED. Those who run fat databases with big malloc/mmap assumptions
> don't probably belong to the group using CONFIG_EMBEDDED.

*sigh* well, the embeded folks are unlikely to have 1-3GB
why not use EXPERIMENTAL if you 'think' the option will
hurt the database folks who do not know to configure their
kernel ...

best,
Herbert

> Jan Engelhardt
> --
-
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: 2006-02-07 01:44    [W:1.741 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site