[PATCH v4 net-next 0/4] net: low latency sockets follow ups

From: Eliezer Tamir
Date: Thu Jun 13 2013 - 21:56:56 EST


Here are three clean up patches, plus one that adds a socket option for LLS.

Patch 1 converts sysctl_net_ll_poll into an unsigned int
Patch 2 converts low latency sockets to sched_clock.
Patch 3 removes the config menu for NET_LL_RX_POLL and defaults to y.
Patch 4 adds an SO_LL socket option to allow per-socket control of busy polling.

I will reply to this thread with a patch to sockperf that enables
the socket option. (unchanged from v2)

Again, thanks to everyone for their comments.


Change log:
- Fixed possible overflow, pointed out by Eric Dumazet.
(reordered the patches)

- Suggested by David Miller and Stephen Hemminger:
added a patch to covert from get_cycles() to sched_clock(),
remove dependency on X86_TSC.
- Suggested by Eric Dumazet:
un-exported sysctl_net_ll_poll since for now it's not needed in modules.

- added a patch to convert sysctl_net_ll_poll into an unsigned int.
- suggested by Eric Dimazet: treat sk_ll_usec as a u_int rather than a u_long.
- suggested by Ben Huchings: allow unprivileged user to decrease SO_LL value,
correct return value when operation is not allowed.

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