Re: Request: I/O request recording

[Davide Libenzi]

On Sat, 24 Jan 2004 Valdis.Kletnieks@xxxxxx wrote:

> On Sat, 24 Jan 2004 15:53:44 PST, Davide Libenzi said:
> 
> > > Anyway, the code's ancient but might provide some ideas:
> > > 
> > > 	http://www.zip.com.au/~akpm/linux/fboot.tar.gz
> > 
> > Warning. I don't know if they do have a patent for this, but MS does this 
> > starting from XP (look inside %WINDIR%\PreFetch). It is both boot and app 
> > based.
> 
> Hmm.. prior art time. ;)
> 
> IBM's OS/VS1 and MVS operating systems had the 'link pack area', where
> frequently loaded modules were loaded at system startup.  And there were
> numerous 3rd party optimizers that would analyze the LOAD SVC patterns on your
> system and produce a list of which modules should be pre-loaded in order to get
> the most bang for the buck (even a *large* 370/168 or 303x processor might be
> able to spare a megabyte tops, so optimizing it was important, and sites would
> spend $5K on software that would optimize the memory usage and save them a
> memory upgrade at $40K a meg...
> 
> This was mid-70s, so definitely pre-XP.

They (MS) do work of a page fault basis though. It is quite different.



- Davide


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