libpager: make the request queue more memory-efficient

Previously, `pager_demuxer' allocated a chunk of memory for the
response message.  But if memory gets scarce, the kernel will issue a
large number of paging requests to free up memory.  In such a
situation, allocating memory is dangerous.

Fix this by not allocating space for the response message, rather, use
a chunk of the workers stack space.  Also, we only handle the `notify'
and `memory_object' protocol, which both only contain simple routines,
we only need a `mig_response_header_t'.

* libpager/demuxer.c (struct request): Remove `inp' and `outp'.
(request_inp): New function.
(pager_demuxer): Do not allocate memory for the response.
(mig_reply_setup): New function.
(worker_func): Adjust accordingly.

0 files changed, 0 insertions, 0 deletions