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| author | David S. Miller <davem@davemloft.net> | 2012-06-15 15:51:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-15 15:51:55 -0700 |
| commit | 7e52b33bd50faa866bc3e6e97e68438bc5e52251 (patch) | |
| tree | 46e68adf23f4f170a0eb5045c33a76234de6cf92 /kernel/time/tick-sched.c | |
| parent | 91c8028c95a468da9c0aafd2d91cf24e27784206 (diff) | |
| parent | 2a0c451ade8e1783c5d453948289e4a978d417c9 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
net/ipv6/route.c
This deals with a merge conflict between the net-next addition of the
inetpeer network namespace ops, and Thomas Graf's bug fix in
2a0c451ade8e1783c5d453948289e4a978d417c9 which makes sure we don't
register /proc/net/ipv6_route before it is actually safe to do so.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/time/tick-sched.c')
| -rw-r--r-- | kernel/time/tick-sched.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 6a3a5b9ff56..da70c6db496 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -576,6 +576,7 @@ void tick_nohz_idle_exit(void) /* Update jiffies first */ select_nohz_load_balancer(0); tick_do_update_jiffies64(now); + update_cpu_load_nohz(); #ifndef CONFIG_VIRT_CPU_ACCOUNTING /* @@ -814,6 +815,16 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer) return HRTIMER_RESTART; } +static int sched_skew_tick; + +static int __init skew_tick(char *str) +{ + get_option(&str, &sched_skew_tick); + + return 0; +} +early_param("skew_tick", skew_tick); + /** * tick_setup_sched_timer - setup the tick emulation timer */ @@ -831,6 +842,14 @@ void tick_setup_sched_timer(void) /* Get the next period (per cpu) */ hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update()); + /* Offset the tick to avert xtime_lock contention. */ + if (sched_skew_tick) { + u64 offset = ktime_to_ns(tick_period) >> 1; + do_div(offset, num_possible_cpus()); + offset *= smp_processor_id(); + hrtimer_add_expires_ns(&ts->sched_timer, offset); + } + for (;;) { hrtimer_forward(&ts->sched_timer, now, tick_period); hrtimer_start_expires(&ts->sched_timer, |