On Tue, 30 Oct 2007 16:55:25 +0100
Jan Kara <jack@suse.cz> wrote:

quoted text
>   Hmm, that's right, but still the kernel->userspace interface could be via
> netlink (which is much more flexible than signals etc.) and then in userspace
> we could implement also some simple interface (UNIX socket?) for server like
> apps...

I think we all agree that it should not be a Unix signal, if only
because glibc cannot manipulate memory pools from signal handlers :)

The low memory message (for lack of a better word) needs to get to
userspace over a file descriptor, which the process can select() or
poll() on from its main loop.

Whether that is a device node, a sysfs file, a netlink socket or
something else ... I don't particularly care :)

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