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@@ -605,7 +605,11 @@ The optional @code{cl_arg} field is a pointer to a buffer (of size
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described by the codelet. For instance, if a codelet implements a computational
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kernel that multiplies its input vector by a constant, the constant could be
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specified by the means of this buffer, instead of registering it as a StarPU
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-data.
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+data. It must however be noted that StarPU avoids making copy whenever possible
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+and rather passes the pointer as such, so the buffer which is pointed at must
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+kept allocated until the task terminates, and if several tasks are submitted
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+with various parameters, each of them must be given a pointer to their own
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+buffer.
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Once a task has been executed, an optional callback function is be called.
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While the computational kernel could be offloaded on various architectures, the
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@@ -3447,7 +3451,7 @@ the SPU. This buffer is then filled with the @code{cl_arg_size} bytes starting
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at address @code{cl_arg}. In this case, the argument given to the SPU codelet
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is therefore not the @code{cl_arg} pointer, but the address of the buffer in
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local store (LS) instead. This field is ignored for CPU, CUDA and OpenCL
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-codelets.
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+codelets, where the @code{cl_arg} pointer is given as such.
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@item @code{callback_func} (optional) (default = @code{NULL}):
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This is a function pointer of prototype @code{void (*f)(void *)} which
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