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Re: [FAQ] ARG_MAX and POSIX


From: Andreas Schwab
Subject: Re: [FAQ] ARG_MAX and POSIX
Date: Wed, 05 Sep 2007 11:56:02 +0200
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (gnu/linux)

address@hidden (Bob Proulx) writes:

> Hi Ralf,
>
> Ralf Wildenhues wrote:
>> You may be interested in that Linux 2.6.23 will remove this limit, see
>> <http://lwn.net/Articles/246528/>.
>
> I am very happy to see the limit removed.  But did I read that log
> message correctly that this is achieved by adding an additional copy
> of all of the data?

There is no additional copy.  Instead of copying the strings via kernel
pages that are later mapped into the new process's VM the data is now
directly copied into the destination VM.  Previously, the new process's
VM didn't exist yet at the time when the copy was made.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstra├če 5, 90409 N├╝rnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




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