[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: problems with hierarchy: L4 pagers
From: |
Neal H. Walfield |
Subject: |
Re: problems with hierarchy: L4 pagers |
Date: |
Thu, 20 Oct 2005 12:01:16 +0100 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/21.4 (i386-pc-linux-gnu) MULE/5.0 (SAKAKI) |
At Tue, 18 Oct 2005 08:39:54 -0400,
Jonathan S. Shapiro wrote:
>
> On Tue, 2005-10-18 at 10:02 +0100, Neal H. Walfield wrote:
> > At Mon, 17 Oct 2005 17:15:06 -0400,
> > Jonathan S. Shapiro wrote:
> > First, you have just multiplied the cost of any IPC involving a map
> > > operation by four additional IPCs. In essence, you have reconstructed
> > > the logic that had to be used to implement COPY on top of REVOCABLE
> > > COPY, but you haven't yet covered all of the necessary advisory
> > > messages.
> >
> > What RPCs? In your example, I see two base IPCs per B page fault:
> > when B faults, the kernel sends an IPC to B' and B' installs the
> > mapping by sending an IPC to B.
>
> I see five:
>
> A must advice A' that it plans to send a mapping to B so
> that A' knows to support later recovery. This is an RPC
> operation. It requires to IPCs.
>
> A now transmits to B: one IPC
>
> B must now advice B' of the existence of the mapping.
> This is another RPC. It requires two IPCs
I think you are describing a possible protocol to establish *how*
mappings can be reconstructed. The protocol I tried to describe was
what happens *when* a mapping needs to be reconstructed.
Thanks,
Neal
- Re: space banks and DMA, (continued)
- Re: space banks and DMA, Jonathan S. Shapiro, 2005/10/13
- DMA vs. Persistence, Jonathan S. Shapiro, 2005/10/13
- General driver DMA (in EROS), Jonathan S. Shapiro, 2005/10/13
- Approaches to storage allocation, Jonathan S. Shapiro, 2005/10/09
- Re: Approaches to storage allocation, Neal H. Walfield, 2005/10/12
- Re: Approaches to storage allocation, Jonathan S. Shapiro, 2005/10/12
- Re: problems with hierarchy: L4 pagers, Neal H. Walfield, 2005/10/17
- Re: problems with hierarchy: L4 pagers, Jonathan S. Shapiro, 2005/10/17
- Re: problems with hierarchy: L4 pagers, Neal H. Walfield, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Jonathan S. Shapiro, 2005/10/18
- Re: problems with hierarchy: L4 pagers,
Neal H. Walfield <=
- Re: problems with hierarchy: L4 pagers, Espen Skoglund, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Jonathan S. Shapiro, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Espen Skoglund, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Jonathan S. Shapiro, 2005/10/19
- Re: problems with hierarchy: L4 pagers, Marcus Brinkmann, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Marcus Brinkmann, 2005/10/18
- Re: problems with hierarchy: L4 pagers, Espen Skoglund, 2005/10/31
- Re: problems with hierarchy: L4 pagers, Jonathan S. Shapiro, 2005/10/31
- Re: problems with hierarchy: L4 pagers, Espen Skoglund, 2005/10/31
Re: capability interface for idl4, Ludovic Courtès, 2005/10/06