Re: [PATCH ] VMSPLIT config options (with default config fixed)

[Herbert Poetzl]

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
> -- 
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