Re: AMAP_SHARED (was Re: XIP)

[Masao Uebayashi <uebayasi%tombi.co.jp@localhost>]

Correction:

On Thu, Nov 04, 2010 at 01:36:15AM +0900, Masao Uebayashi wrote:
> I have found that XIP is very similar to AMAP_SHARED, at the point
> where XIP supports "write" operation.
> 
> Imagine a FlashROM page is XIP'ed and shared as vnode by processes.
> The user rewrite the firmware written onto the FlashROM.  To keep
> processes running, we need to copy the XIP pages into RAM (page
> cache), put those pages into the vnode, then notify processes to
> update their VA.  This is another kind of COW, done in another
               ^^
s/VA/PV/.  VA stays same.

> layer.
> 
> Of course, we need PV tracking here.