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From Egor Pasko <egor.pa...@gmail.com>
Subject Re: [drlvm][gc] difference between compiled code and object data
Date Thu, 21 Feb 2008 12:36:17 GMT
On the 0x3F1 day of Apache Harmony Xiao-Feng Li wrote:
> On Thu, Feb 21, 2008 at 11:17 AM, Simon Chow <simon.harmony@gmail.com> wrote:
> > Thanks. It is every helpful!
> >  So how does Harmony manage JIT generated code at runtime? Is there some
> >  consideration for code locality improvement?
> >
> 
> Simon, let the JIT people to answer the question.

Simon, within each method Jitrino performs some code layout
optimizations. But Jitrino does not bother with cross-method code
locality, just asks VM to allocate code with
method_allocate_code_block().

Does that answer your question?

> For your reference,
> please check the paper below:
> Dynamic code management: improving whole program code locality in
> managed runtimes. by Xianglong Huang, Brian T. Lewis, Kathryn S.
> McKinley: VEE 2006: 133-143.
> 
> >
> >  On 21/02/2008, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:
> >  >
> >  > Simon, currently, Harmony manages VM data and Java heap separately.
> >  > Java Heap is a specific term for the space that is managed by GC for
> >  > Java objects. VM data such as VM data structures and  JIT generated
> >  > code have their respective management, not managed by GC. They are
> >  > interacting in certain contexts, such as class loading/unloading,
> >  > etc., where native data have pointers to Java objects or the reverse.
> >  > But basically they are independent at the moment.
> >  >
> >  > Thanks,
> >  > xiaofeng
> >  >
> >  >
> >  > On Thu, Feb 21, 2008 at 9:57 AM, Simon Chow <simon.harmony@gmail.com>
> >  > wrote:
> >  > > I find the compiled code produced by JIT is placed in the JVM heap space
> >  > >  (0xA0000000~0xB0000000 by default) as well as object data, is that
> >  > true?
> >  > >  What's the difference of memory management policies used for object
> >  > data and
> >  > >  compiled code?
> >  > >
> >  > >
> >  > >  --
> >  > >  From : Simon.Chow@Software School of Fudan University
> >  > >
> >  >
> >  >
> >  >
> >  >
> >  > --
> >  > http://xiao-feng.blogspot.com
> >  >
> >
> >
> >
> >  --
> >
> >
> > From : Simon.Chow@Software School of Fudan University
> >
> 
> 
> 
> -- 
> http://xiao-feng.blogspot.com
> 

-- 
Egor Pasko


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