: If this is the case, then it cannot be done with just a single shared
: memory backing store anyway, and it really needs the kind of support that
: the current shmem code already does (so I could just make a anonymous
: shared mapping turn into a shmem block internally - fairly easy).
This is the case :-)
I even do not understand how you imagined sharing of shared anon. mmap
with someone but children :-) Well, previous unix designers were stupid
but not so stupid as you believed ...long loughter...
So, now you know, that it is really good thing. Nope, it is very good thing,
which must be implemented NOW.
Only do not turn it into sysv shmem block, it would be hack.
Please, move shmem handling to mm directory and emulate that bizarre
sysv shm on the top of it.
Posix shmem, that differs of SYSV shm mainly by better API
(it has file descriptor and keyed by strings), that's true interface
to shmem.
Alexey Kuznetsov