RE : [Tsp-devel] suppression des STRACE_IO

[TSP]

J'avais proposé à Stephane Gal... de les supprimer à la fin du dvp, et j'ai
déjà commencé à en enlever certaines ( sans le dire ...sic...) car cela me
gonflait de voir des fonctions quasiment vides avec du STRACE partout.
Y++

-----Original Message-----
From: address@hidden [mailto:address@hidden
Sent: Tuesday, April 04, 2006 4:00 PM
To: address@hidden
Subject: [Tsp-devel] suppression des STRACE_IO


Est-ce que quelqu'un voit un inconvénient à la
suppression des STRACE_IO.

Je trouve que finalement ça alourdi le code et c'est
peu utile?
(même si je trouvais l'idée très bonne au départ soyions clairs)

D'autant que suite à une échange de mail avec Fred avec GCC on
a d'autres moyens de tracer les appels de fonctions:

http://en.wikipedia.org/wiki/Performance_analysis
 et notamment l'option: -finstrument-functions

cf
http://gcc.gnu.org/onlinedocs/gcc-4.0.2/gcc/Code-Gen-Options.html#Code-Gen-O
ptions
>>>>>>>>>
-finstrument-functions
    Generate instrumentation calls for entry and exit to functions. Just
after function entry and just before function exit, the following profiling
functions will be called with the address of the current function and its
call site. (On some platforms, __builtin_return_address does not work beyond
the current function, so the call site information may not be available to
the profiling functions otherwise.)

              void __cyg_profile_func_enter (void *this_fn,
                                             void *call_site);
              void __cyg_profile_func_exit  (void *this_fn,
                                             void *call_site);
        

    The first argument is the address of the start of the current function,
which may be looked up exactly in the symbol table.

    This instrumentation is also done for functions expanded inline in other
functions. The profiling calls will indicate where, conceptually, the inline
function is entered and exited. This means that addressable versions of such
functions must be available. If all your uses of a function are expanded
inline, this may mean an additional expansion of code size. If you use
`extern inline' in your C code, an addressable version of such functions
must be provided. (This is normally the case anyways, but if you get lucky
and the optimizer always expands the functions inline, you might have gotten
away without providing static copies.)

    A function may be given the attribute no_instrument_function, in which
case this instrumentation will not be done. This can be used, for example,
for the profiling functions listed above, high-priority interrupt routines,
and any functions from which the profiling functions cannot safely be called
(perhaps signal handlers, if the profiling routines generate output or
allocate memory).
>>>>>>>>>>
---
Eric Noulard - Software Architect
BT Consulting & Systems Integration
tel: (+33) (0)534 604970
mob: (+33) (0)607 948100
web: www.bt.com/consulting




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