Re: [Gems-users] OS Context Switches

[Luke Yen <lyen@xxxxxxxxxxx>]

  Yes it is, and with the new GEMS 2.0 you can do so with the 
SimicsHypervisor code.  This class was meant to be used as part of the 
all-in-simulator version of LogTM-SE style support for virtualizing 
transactions.  To do this we needed to be able to detect context (both 
process & thread) switches and page remapping.
  In SPARC a pointer to the thread's software context structure resides in 
the %g7 register, and detecting changes to this on mode changes 
(user<->supervisor) is sufficient to detect thread switches.  Process 
switches need to look at the ASID register as well.  Take a look at the 
functions in SimicsHypervisor.C for more details.
  Luke

On Wed, 10 Oct 2007, Dave Z. wrote:

> Hello,
>
> I have a question regarding operating system context
> switches. Is it possible to detect context switches in
> Ruby? For example, is it possible to detect if a
> thread has migrated from one processor to another? I
> would like to find out the impact of context switches
> on the memory model I'm working on.
>
> Thank you for your help.
>
> Dave
>
>
>
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