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| author | Ingo Molnar <mingo@elte.hu> | 2007-02-19 18:11:56 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-19 14:18:43 -0800 |
| commit | 6ba9b346e1e0eca65ec589d32de3a9fe32dc5de6 (patch) | |
| tree | 393923cf8c563be65bb02a38153e387f6284ae55 /kernel | |
| parent | 2aa6eb313e57a8254b17e60b8bb5e0a2570d7776 (diff) | |
| download | blackbird-op-linux-6ba9b346e1e0eca65ec589d32de3a9fe32dc5de6.tar.gz blackbird-op-linux-6ba9b346e1e0eca65ec589d32de3a9fe32dc5de6.zip | |
[PATCH] NOHZ: Fix RCU handling
When a CPU is needed for RCU the tick has to continue even when it was
stopped before.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/tick-sched.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 95e41f7f850b..9234e44fc94a 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -191,19 +191,19 @@ void tick_nohz_stop_sched_tick(void) next_jiffies = get_next_timer_interrupt(last_jiffies); delta_jiffies = next_jiffies - last_jiffies; + if (rcu_needs_cpu(cpu)) + delta_jiffies = 1; /* * Do not stop the tick, if we are only one off * or if the cpu is required for rcu */ - if (!ts->tick_stopped && (delta_jiffies == 1 || rcu_needs_cpu(cpu))) + if (!ts->tick_stopped && delta_jiffies == 1) goto out; /* Schedule the tick, if we are at least one jiffie off */ if ((long)delta_jiffies >= 1) { - if (rcu_needs_cpu(cpu)) - delta_jiffies = 1; - else + if (delta_jiffies > 1) cpu_set(cpu, nohz_cpu_mask); /* * nohz_stop_sched_tick can be called several times before |
