From: Andi Kleen <andi@firstfloor.org>
To: David Newall <davidn@davidnewall.com>
Cc: Andi Kleen <andi@firstfloor.org>,
akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH for mm] Remove iBCS support
Date: Sun, 20 Jan 2008 06:18:22 +0100 [thread overview]
Message-ID: <20080120051822.GB19784@one.firstfloor.org> (raw)
In-Reply-To: <4792D221.1010704@davidnewall.com>
On Sun, Jan 20, 2008 at 03:16:25PM +1030, David Newall wrote:
> Andi Kleen wrote:
> > On Sun, Jan 20, 2008 at 12:57:29PM +1030, David Newall wrote:
> >
> >> compatibility. This is a sleeping giant for Linux. There are plenty of
> >>
> >
> > Interesting choice of words.
> >
> KFC and Dominoes use SCO for their cash registers, to pick just two
> enormous future opportunities.
I suppose if they update their cash registers they will just go
with fully Linux binaries.
> > But it does not make sense for all Linux kernels to always check for iBCS executables
> > when they don't have to code to run them anyways.
> >
>
> I don't suppose you're suggesting this will make a big difference. Even
> if every exec did nothing but immediately exit, it still wouldn't make
> much difference.
It's not a big difference, but why do unnecessary work on all
Linux kernels? There are a lot of Linux machines out there and
if all of them only do a little unnecessary work each fork()
over a year it adds up to really a lot of wasted cycles.
Especially since the few people who might really
need it can easily readd it.
> Likewise, I take your point about proper iBCS support (and I suppose
> it's really iBCS2 that we're talking about.) My concern is that
> removing this now gains almost nothing, 2 strcmp per exec is as close to
> nothing as anything, but it sends a message with which I disagree. The
> message should be that Linux is good for, well the same things FreeBSD
> is, and includes running Solaris and SCO binaries. This is a major
But Linux is not good for this currently, at least not unless you
add a significant patch (which I'm not sure does even exist
for modern 2.6; iBCS was mainly deployed on 2.4 kernels). And when you
add that patch you can easily readd the strcmps too.
> simplification of the story, I know, but still hits the plot highlights.
You're worried about this patch generating headlines?
-Andi
next prev parent reply other threads:[~2008-01-20 5:15 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-19 4:59 [PATCH for mm] Remove iBCS support Andi Kleen
2008-01-20 2:27 ` David Newall
2008-01-20 3:11 ` Andi Kleen
2008-01-20 4:46 ` David Newall
2008-01-20 5:18 ` Andi Kleen [this message]
2008-01-20 5:33 ` David Newall
2008-01-20 5:55 ` Andi Kleen
2008-01-20 6:23 ` David Newall
2008-01-20 7:29 ` Andi Kleen
2008-01-21 1:37 ` David Newall
2008-01-22 10:24 ` Karl Kiniger
2008-01-22 15:06 ` David Newall
2008-01-22 15:52 ` Adrian Bunk
2008-01-23 8:48 ` Andi Kleen
2008-01-23 14:12 ` Karl Kiniger
2008-01-23 14:24 ` Andi Kleen
2008-01-24 17:06 ` David Newall
2008-01-22 11:12 ` Ingo Molnar
2008-01-22 12:42 ` Karl Kiniger
2008-01-22 15:13 ` David Newall
2008-01-22 15:49 ` Ingo Molnar
2008-01-24 17:01 ` David Newall
2008-01-22 16:01 ` Adrian Bunk
2008-01-24 17:04 ` David Newall
2008-01-24 17:24 ` Adrian Bunk
2008-01-24 17:55 ` David Newall
2008-01-24 18:14 ` Adrian Bunk
2008-01-25 2:14 ` David Newall
2008-01-25 5:12 ` Valdis.Kletnieks
2008-01-25 16:40 ` Alan Cox
2008-01-24 19:51 ` Pavel Machek
2008-01-25 2:17 ` David Newall
2008-01-24 20:37 ` Andi Kleen
2008-01-25 2:16 ` David Newall
2008-01-22 16:50 ` Alan Cox
2008-01-24 17:08 ` David Newall
2008-01-22 13:20 ` Giulio
2008-01-20 13:06 ` Alan Cox
2008-01-20 13:43 ` David Newall
2008-01-20 13:51 ` Alan Cox
2008-01-25 12:17 ` Ingo Molnar
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