per process I/O stats ?

[Guillaume Thouvenin <guillaume.thouvenin@polymtl.ca>]

Hello,

 Is there a way to get information about I/O like how many blocks and char read
or wrote by a process? This kind of information is available per-cpu but I don't
find it per-process. Field "io_context" find in the task_struct doesn't give
this information. 

 I ask that because I wanted to use information given by BSD process accounting
but this information isn't complete. In particular in do_acct_process():

    ...
    ac.ac_io = encode_comp_t(0 /* current->io_usage */);    /* %% */           
                                                                 
    ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
    ...

 Thus, what replace current->io_usage in the 2.6 kernels? 
 Do I need to add code in the kernel to get this information?

Thanks for your help
Guillaume

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