From mboxrd@z Thu Jan  1 00:00:00 1970
From: viro@parcelfarce.linux.theplanet.co.uk
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Threads: Sewing badges of honor onto a Kernel
Message-ID: <20040228185347.GE16357@parcelfarce.linux.theplanet.co.uk>
References: <20040228141458.GD16357@parcelfarce.linux.theplanet.co.uk> <001d01c3fe27$09478e90$2bdcfea9@blue>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <001d01c3fe27$09478e90$2bdcfea9@blue>
User-Agent: Mutt/1.4.1i
Date: Sat, 28 Feb 2004 18:53:47 +0000
Topicbox-Message-UUID: 02f96e38-eacd-11e9-9e20-41e7f4b1d025

On Sat, Feb 28, 2004 at 06:16:50PM -0000, Nigel Roles wrote:

> The question is, does this make Linux 'right' and Plan 9 'wrong',
> which was quite a bit of what touched off the thread?
>
> Neither, I would have thought.

<shrug>

There is only one way to figure out and it had been described upthread.
For Linux such experiments had been done and results were very clear -
price of TLB flushes was considerable and that's aside of the complexity
of supporting a lot of mappings with partial VM sharing.  For Plan 9 the
answer might be different, might be the same, but there's no way to
pull that answer out of thin air.  FWIW, I suspect that full-shared
VM would be a win, but it can only be decided by trying and comparing.
End of story, unless somebody has time for that work and is willing to
do it.