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SubjectRe: What's wrong with MAP_SHARED|MAP_ANONYMOUS?
On Sun, Sep 27, 1998 at 04:10:02PM +0200, Alexey Kuznetsov wrote:
> Hello!
>
> > These mappings have a big advantage over anonymous mappings too - you
> > can pass them around between processes using fd descriptor passing.
>
> How to prevent aggressive syncing dirty pages to disk for them?
> They should make swap-like syncs to be useful.

True, it would be worth a mprotect() flag.

What I would like to see in 2.3 would be a special device works that
hands out anonymous swap space associated with a fd
(something like a combination of /dev/zero and a SVR4 clone device)

With that POSIX shared memory could be implemented in user space -
using a daemon and access to the daemon's /proc/<pid>/fd/* files.
-Andi

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