Re: VM tuning through fault trace gathering [with actual code]

[Marcelo Tosatti]

On 26 Jun 2001, John Fremlin wrote:

> Marcelo Tosatti <[e-mail]> writes:
> 
> > On 25 Jun 2001, John Fremlin wrote:
> > 
> > > 
> > > Last year I had the idea of tracing the memory accesses of the system
> > > to improve the VM - the traces could be used to test algorithms in
> > > userspace. The difficulty is of course making all memory accesses
> > > fault without destroying system performance.
> 
> [...]
> 
> > Linux Trace Toolkit (http://www.opersys.com/LTT) does that. 
> 
> I dld the ltt-usenix paper and skim read it. It didn't seem to talk
> about page faults much. Where should I look?

Grab the source and try it out?

Example page fault trace: 

####################################################################
Event     	          Time                   PID     Length Description
####################################################################

Trap entry              991,299,585,597,016     678     12      TRAP: page fault; EIP : 0x40067785