Re: fstep added

[Andrew Cagney <cagney@redhat.com>]

Unfortunatly current kernels don't allow mmapping of /proc/PID/maps; 
however open/pread works.

Andrew

Mark Wielaard wrote:
> On Mon, 2007-01-22 at 07:51 -0600, Phil Muldoon wrote: 
>   
>> Resurrecting this thread for a little bit. Is this issue related to:
>>
>> http://sourceware.org/bugzilla/show_bug.cgi?id=3727
>>
>> I'm hazarding a guess this all comes down to ptrace accessing the 
>> inferior's memory word by word, and that optimizations made in access to 
>> the inferior's memory (ie by mmaping /proc/$$/memory) will benefit fcore 
>> as well as fstep? My knowledge here is really fuzzy.
>>     
>
> Yes and http://sourceware.org/bugzilla/show_bug.cgi?id=3761 which are
> basically the same issue. To speedup fstep and fcore) we would like to
> mmap /proc/<pid>/mem for the inferior and wrap it in an inua ByteBuffer.
> This doesn't provide write access, but we do reads mostly anyway. You
> can imagine a ByteBuffer returned by Task.getMemory() that delegates
> reads through such an mmap backed inua ByteBuffer and writes delegated
> through a ptrace backed inua ByteBuffer.
>
> Cheers,
>
> Mark
>
>