> > I kept on getting requests from application developers who want that
> > feature. My initial patch was dated back May 2004.
>
> The right way to do it involves synchronization between the kernel side
> io_getevents() and the userspace code pulling events out of the ring.
> Alan Cox suggested embedding a futex in the shared memory region, but I
> don't think anyone ever implemented that.
Yeah, I like the idea of futexes.
I'm worried that virtual aliasing spells doom for the current
home-brewed serialization that fs/aio.c is doing with the shared ring
head/tail accesses. Am I worrying about nothing here?
> > I will look into this aside from this patch.
>
> That's probably the case. Also, any changes in this area *must* correctly
> update the compat/incompat feature flags in the ring buffer header. That
> has been missed in the past...
Do you know of anyone using the current ring info ABI?
The *only* user I know of is the check of ctx->magic in libaio.
- z
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