Re: [Gems-users] Backoff code in LogTM

[Konstantinos Nikas <knikas@xxxxxxxxxxxxxxxxx>]

Mohammad Momin Ansari wrote:
> Hi,
>
> I'm interested in investigating contention management in HTMs. I've got  
> Simics 3.0 and GEMS 2.1 working, and I've started looking through the  
> LogTM code. I think the backoff code in  
> ruby/logtm/TransactionInterfaceManager.c:733-739 should be at the end of  
> restartTransactionCallback(), and not where it is at the moment. Does this  
> sound correct to experienced users of LogTM?
> Thanks,
>
>   
Hi Mohammad,

I may be wrong but I 'll risk an answer. The backoff call you are 
mentioning is for XACT_LAZY_VM, and thus not for "pure" LogTM. The 
backoff call for LogTM is inside the software handler, which you can 
find in
microbenchmarks/transactional/common/transaction.c

at the end of tm_log_unroll function.

Hopefully, someone can confirm this.

Kind regards,

Kostis