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Subject: Re: [PATCH ]  VMSPLIT config options (with default config fixed)
From: Arjan van de Ven <arjan@infradead.org>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Mark Lord <lkml@rtr.ca>, Ulrich Mueller <ulm@kph.uni-mainz.de>,
       Herbert Poetzl <herbert@13thfloor.at>, linux-kernel@vger.kernel.org,
       Jens Axboe <axboe@suse.de>, Linus Torvalds <torvalds@osdl.org>,
       Byron Stanoszek <gandalf@winds.org>, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@osdl.org>
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Date: Sun, 05 Feb 2006 16:38:33 +0100
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On Sat, 2006-02-04 at 12:05 +0100, Jan Engelhardt wrote:
> >
> > Mmm.. bad idea.  As much as I'd like the default to be 3GB_OPT, that would
> > be a big impact to userspace, and there's no point in breaking everyone's
> > machines when advanced users can just reconfig/recompile to get what they want.
> >
> 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...