* Re: Demand paging - Kernel
@ 2003-03-16 2:11 Felipe Alfaro Solana
2003-03-16 15:44 ` Breno
0 siblings, 1 reply; 6+ messages in thread
From: Felipe Alfaro Solana @ 2003-03-16 2:11 UTC (permalink / raw)
To: Breno, Kernel List
----- Original Message -----
From: "Breno" <brenosp@brasilsec.com.br>
Date: Sat, 15 Mar 2003 13:29:52 -0300
To: "Kernel List" <linux-kernel@vger.kernel.org>
Subject: Demand paging - Kernel
> There is a possibility to do demand paging in kernel space address ?
Why? I would like to know your reasons :-)
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Demand paging - Kernel
2003-03-16 2:11 Demand paging - Kernel Felipe Alfaro Solana
@ 2003-03-16 15:44 ` Breno
0 siblings, 0 replies; 6+ messages in thread
From: Breno @ 2003-03-16 15:44 UTC (permalink / raw)
To: Felipe Alfaro Solana, Kernel List
Hi Filipe
There is no reason , just i want know if possible.
thanks
----- Original Message -----
From: "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org>
To: "Breno" <brenosp@brasilsec.com.br>; "Kernel List"
<linux-kernel@vger.kernel.org>
Sent: Saturday, March 15, 2003 11:11 PM
Subject: Re: Demand paging - Kernel
> ----- Original Message -----
> From: "Breno" <brenosp@brasilsec.com.br>
> Date: Sat, 15 Mar 2003 13:29:52 -0300
> To: "Kernel List" <linux-kernel@vger.kernel.org>
> Subject: Demand paging - Kernel
>
> > There is a possibility to do demand paging in kernel space address ?
>
> Why? I would like to know your reasons :-)
> --
> ______________________________________________
> http://www.linuxmail.org/
> Now with e-mail forwarding for only US$5.95/yr
>
> Powered by Outblaze
^ permalink raw reply [flat|nested] 6+ messages in thread
* Demand paging - Kernel
@ 2003-03-15 16:29 Breno
2003-03-17 14:35 ` Tommy Reynolds
0 siblings, 1 reply; 6+ messages in thread
From: Breno @ 2003-03-15 16:29 UTC (permalink / raw)
To: Kernel List
Hi
There is a possibility to do demand paging in kernel space address ?
thanks
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Demand paging - Kernel
2003-03-15 16:29 Breno
@ 2003-03-17 14:35 ` Tommy Reynolds
2003-03-17 21:59 ` Horst von Brand
0 siblings, 1 reply; 6+ messages in thread
From: Tommy Reynolds @ 2003-03-17 14:35 UTC (permalink / raw)
To: Breno; +Cc: linux-kernel
Uttered "Breno" <brenosp@brasilsec.com.br>, spoke thus:
> There is a possibility to do demand paging in kernel space address ?
No. The entire kernel, and all of its data structures, are resident in
memory all of the time. Kernel demand paging is not possible, not
necessary and not implemented.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Demand paging - Kernel
2003-03-17 14:35 ` Tommy Reynolds
@ 2003-03-17 21:59 ` Horst von Brand
2003-03-18 15:08 ` Tommy Reynolds
0 siblings, 1 reply; 6+ messages in thread
From: Horst von Brand @ 2003-03-17 21:59 UTC (permalink / raw)
To: Tommy Reynolds; +Cc: linux-kernel
Tommy Reynolds <reynolds@redhat.com> said:
> Uttered "Breno" <brenosp@brasilsec.com.br>, spoke thus:
> > There is a possibility to do demand paging in kernel space address ?
> No. The entire kernel, and all of its data structures, are resident in
> memory all of the time.
In the current Linux kernel, that is.
> Kernel demand paging is not possible,
It is certainly possible (you could mark areas that don't contain currently
used stuff for pageout). It is extremely hairy to do right (just see the
mess with module loading/unloading, which is some of the same stuff, very
tamed).
> not
> necessary and not implemented.
The cost of doing it right in a monolitic kernel would probably outweigh
the gains manyfold, and require massive redesign for Linux. In microkernels
it is a lot easier to do (but their performance sucks baby elephants
through straws, so they are moot :-)
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Demand paging - Kernel
2003-03-17 21:59 ` Horst von Brand
@ 2003-03-18 15:08 ` Tommy Reynolds
0 siblings, 0 replies; 6+ messages in thread
From: Tommy Reynolds @ 2003-03-18 15:08 UTC (permalink / raw)
To: Horst von Brand; +Cc: linux-kernel
Uttered Horst von Brand <vonbrand@inf.utfsm.cl>, spoke thus:
> Tommy Reynolds <reynolds@redhat.com> said:
> > Uttered "Breno" <brenosp@brasilsec.com.br>, spoke thus:
> > > There is a possibility to do demand paging in kernel space address ?
> > No. The entire kernel, and all of its data structures, are resident in
> > memory all of the time.
> The cost of doing it right in a monolitic kernel would probably outweigh
> the gains manyfold, and require massive redesign for Linux. In microkernels
> it is a lot easier to do (but their performance sucks baby elephants
> through straws, so they are moot :-)
Dr. von Brand,
Thanks for following up on this. You are right, of course: with the
source code and enough patience anything could be crafted. I answered
in the sense of "is this currently implemented", and it's not ;-)
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-03-18 14:57 UTC | newest]
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2003-03-16 2:11 Demand paging - Kernel Felipe Alfaro Solana
2003-03-16 15:44 ` Breno
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2003-03-15 16:29 Breno
2003-03-17 14:35 ` Tommy Reynolds
2003-03-17 21:59 ` Horst von Brand
2003-03-18 15:08 ` Tommy Reynolds
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