RE: [PATCH v9 net-next 5/7] net: simple poll/select low latency socket poll

[David Laight]

> I am a bit uneasy with this one, because an applicatio polling() on one
> thousand file descriptors using select()/poll(), will call sk_poll_ll()
> one thousand times.

Anything calling poll() on 1000 fds probably has performance
issues already! Which is why kevent schemes have been added.

At least the Linux code doesn't use a linked list for
the fd -> 'struct file' map which made poll() O(n^2),
and getting to that number of open fds O(n^3) on
some versions of SVR4.

	David

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