Re: [rvm-research] Jikes Code Cache Management

Hi,

Thank you for your replies, I am looking for space management.

Thank you

Pushparaj

On Thu, May 9, 2013 at 3:40 AM, David P Grove <[email protected]> wrote:

> Michael Bond <[email protected]> wrote on 05/08/2013 04:53:32
> PM:
>
>
> >
> > By default, USE_CODE_SPACE is true, and (machine) code is allocated into
> > special code spaces that are non-moving spaces. However, if
> > USE_CODE_SPACE is false, then it looks like code is allocated into the
> > default space, which could be a moving space. Assuming that's right,
> > then I'm not entirely sure how pointers to code are updated. At least
> > some calls are indirect: they go through TIBs (virtual dispatch) or the
> > JTOC (static methods), so just updating these tables is sufficient. Are
> > all calls indirect, or are there direct calls in the code that need to
> > be updated by updating pointers in the code itself? I suspect that all
> > calls are performed indirectly rather than having absolute hard-coded
> > callee addresses in the code.
> >
>
> Independent of USE_CODE_SPACE, all calls in Jikes RVM are indirect. (even
> static calls indirect through the JTOC).  On the plus side, this makes
> adaptive recompilation very simple (install a new version of the code
> simply by updating a TIB/JTOC pointer).  On the minus side, we are likely
> losing at least some performance by indirecting on every call.
>
> I'd started working on implementing support for direct (pc-relative) calls
> back at OOPSLA'07 in Montreal, but never completed it.  I still have a
> patch set kicking around if anyone wants to take another run at it.  I
> figured it was going to take me a month +/- of solid work to make all the
> needed changes (pc relative calls on both platforms, still supporting GC of
> code, adaptive recompilation, etc).
>
> --dave
>
>
>
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Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and 
their applications. This 200-page book is written by three acclaimed 
leaders in the field. The early access version is available now. 
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may

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