sched: Compute avg_nr_running

Change-Id: I8ef699df0133d97c067ba225e633776f5006d32c
net: loopback: set default mtu to 64K

loopback current mtu of 16436 bytes allows no more than 3 MSS TCP
segments per frame, or 48 Kbytes. Changing mtu to 64K allows TCP
stack to build large frames and significantly reduces stack overhead.

Performance boost on bulk TCP transferts can be up to 30 %, partly
because we now have one ACK message for two 64KB segments, and a lower
probability of hitting /proc/sys/net/ipv4/tcp_reordering default limit.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
cpufreq: Backport commit 8770f9f9171e869cf6398d1af3fa1231badbbc9e

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
Makefile: Add another graphite flag

Honestly, I don't know whether -fgraphite is an actual flag. Just put both flags in case.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
ghost: Kill most debugging by now

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>