Re: [PATCH] /dev/epoll update ...

[Jamie Lokier]

Davide Libenzi wrote:
> Sure you can avoid the scan, if you pick up one event at a time.  To
> be compared to /dev/epoll you need the signal-per-fd patch plus a
> method to collect the whole event-set in a single system call ( see
> perfs ).

Yes, I agree.  A variant of sigwaitinfo that will return multiple queued
signals was mentioned ages ago, but because the siginfo structure is
much larger than is needed, that isn't a very effective use of cache.

Something specialised for fd events is more appropriate IMO.  Large
numbers of queued RT signals aren't used for anything else AFAIK anyway,
not even timers.

-- Jamie