Hi
I think technically it is possible. Although I don't know the exact
how-to, it can be done by kmalloc(GFP_USER), and then creating proper
VMA (or insert the page to a VMA).
this can be done how?
Sorry, I don't know the detail. try to check LDD3...
the problem is that i do not know the size of data chunk before i ask
kernel to fill it.
OK, since I don't know your exact detail, I can only suggest this.
Certainly the size of the data you want to pass to the user space have
maximum size, right? So, why not allocate that much first? This way:
1. You'll leave the management of memory block to the user space.
2. user space has freedom to decide where to put the allocated memory
and in case of no free memory space available, kernel can anticipate
that so it can delay to transfer the data.
I hope it may help you....
regards,
Mulyadi
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