Thanks Mahita for spotting a real bug. I have posted a fix [1]; hopefully it will be backported to gem5 v21.1
Kind regards Giacomo [1]: https://gem5-review.googlesource.com/c/public/gem5/+/51407 > -----Original Message----- > From: Mahita Nagabhiru <[email protected]> > Sent: 01 October 2021 20:07 > To: Giacomo Travaglini <[email protected]> > Cc: gem5 users mailing list <[email protected]> > Subject: Re: [gem5-users] Support for CAS (compare and swap) instruction in > ARM arch > > Hi Giacomo, > > Looks like the regStats() function in HTMSequencer was interfering with > ClockedObject::regStats() in AbstractController.cc; not fully sure what both > regStats do but I commented regStats() out from HTMSequencer and the > HTM part seems to be working now. I need to look into extending CAS to > work with ruby next- so I will reach out again when I get stuck. > > On Thu, Sep 30, 2021 at 5:07 PM Giacomo Travaglini > <[email protected] <mailto:[email protected]> > > wrote: > > > Hi Mahita, > > Could you debug it with gdb and let us know which stat gets > initialized twice? > > Kind Regards > > Giacomo > > > -----Original Message----- > > From: Mahita Nagabhiru <[email protected] > <mailto:[email protected]> > > > Sent: 29 September 2021 12:00 > > To: Giacomo Travaglini <[email protected] > <mailto:[email protected]> > > > Cc: gem5 users mailing list <[email protected] <mailto:gem5- > [email protected]> > > > Subject: Re: [gem5-users] Support for CAS (compare and swap) > instruction in > > ARM arch > > > > Thanks a lot Giacomo. > > By default (without ruby), I am able to run my microbenchmark > now; but I > > am trying to use the ruby side for memory modelling- I need to > model CAS > > using that and also be able to use ARM HTM feature but when I run > using "-- > > ruby", I get the following panic message: > > "build/ARM_MESI_Three_Level_HTM/base/statistics.hh:953: fatal: > fatal > > condition check() occurred: Stat has already been initialized" > > I have attached a log-file is that helps. > > I tried inspecting the usual files like > > src/mem/ruby/structures/CacheMemory.* , Sequencer, > HtmSequencer etc > > but I cannot find the cause. > > I was able to use the HTM feature on the 20.1 stable version of > gem5; so I am > > trying to do a diff between the latest files and the working version > and I saw > > most changes were to accommodate the statistics base class > correctly. > > I am not very well versed with gem5, so I'm really struggling to > figure out the > > cause. Any suggestions? > > > > On Tue, Sep 28, 2021 at 3:50 PM Giacomo Travaglini > > <[email protected] > <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]> > > > > wrote: > > > > > > Hi Mahita, > > > > Yes Armv8.1-LSE is implemented and therefore you should be > able to > > use CAS > > > > ISA definition of CAS: > > > https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/insts/amo64.i > > sa#L226 > > System level switch for LSE: > > > https://github.com/gem5/gem5/blob/stable/src/arch/arm/ArmSystem.py#L > > 75 > > > > As you can see we support it by default so you should be able to > use > > it with no modification needed > > > > Kind Regards > > > > Giacomo > > > > > -----Original Message----- > > > From: Mahita Nagabhiru via gem5-users <gem5- > [email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]> > > > > > Sent: 28 September 2021 15:42 > > > To: [email protected] <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]> > > > > Cc: Mahita Nagabhiru <[email protected] > <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]> > > > > > Subject: [gem5-users] Support for CAS (compare and swap) > > instruction in > > > ARM arch > > > > > > Hi, > > > > > > I am trying to experiment with lock-free data structures and > one of > > the key > > > instructions in my microbenchmarks is CAS (compare and swap) > > instruction. I > > > need this in ARM architecture; I saw that gem5 page says LSE > > extensions are > > > supported but I cannot find anything relevant in the "src/" > directory > > on a > > > quick grep except for a line in a config life: > > src/arch/arm/ArmSystem.py. Am I > > > missing something here? Is there a guideline as to how to add > > support for an > > > instruction for aarch64 in case it is not present? > > > Any help would be highly appreciated! > > > > > > > > > -- > > > > > > Mahita Nagabhiru > > IMPORTANT NOTICE: The contents of this email and any > attachments > > are confidential and may also be privileged. If you are not the > intended > > recipient, please notify the sender immediately and do not disclose > the > > contents to any other person, use it for any purpose, or store or > copy the > > information in any medium. Thank you. > > > > > > > > > > -- > > > > Mahita Nagabhiru > IMPORTANT NOTICE: The contents of this email and any attachments > are confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > > > > > -- > > Mahita Nagabhiru IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ gem5-users mailing list -- [email protected] To unsubscribe send an email to [email protected] %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
