Re: [RFC] VM: I have a dream...

[Nikita Danilov]

Ram Gupta writes:
 > On 1/23/06, Nikita Danilov <nikita@xxxxxxxxxxxxx> wrote:
 > 
 > >
 > > The unique feature that Mac OS X VM does have, on the other hand, is
 > > that it keeps profiles of access patterns of applications, and stores
 > > then in files, associated with executables. This allows to quickly
 > > pre-fault necessary pages during application startup (and this makes OSX
 > > boot so fast).
 > 
 > This feature is interesting though I am not sure about the fast boot
 > part of OSX.
 > as at boot time these applications are all started first time. So
 > there were no access pattern as yet. They still have to be demand

That's the point: information about access patterns is stored in the
file. So next time when application is started (e.g., during boot)
kernel reads that file and pre-faults pages.

 > paged. But yes later accesses may be faster.
 > 
 > Thanks
 > Ram gupta

Nikita.
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