rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU
Make the holdoff only happen when the full number of attempts have been made. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1267311188-16603-1-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 5 additions and 3 deletions
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@ -1010,6 +1010,10 @@ int rcu_needs_cpu(int cpu)
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int c = 0;
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int c = 0;
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int thatcpu;
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int thatcpu;
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/* Check for being in the holdoff period. */
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if (per_cpu(rcu_dyntick_holdoff, cpu) == jiffies)
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return rcu_needs_cpu_quick_check(cpu);
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/* Don't bother unless we are the last non-dyntick-idle CPU. */
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/* Don't bother unless we are the last non-dyntick-idle CPU. */
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for_each_cpu_not(thatcpu, nohz_cpu_mask)
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for_each_cpu_not(thatcpu, nohz_cpu_mask)
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if (thatcpu != cpu) {
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if (thatcpu != cpu) {
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@ -1041,10 +1045,8 @@ int rcu_needs_cpu(int cpu)
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}
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}
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/* If RCU callbacks are still pending, RCU still needs this CPU. */
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/* If RCU callbacks are still pending, RCU still needs this CPU. */
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if (c) {
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if (c)
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raise_softirq(RCU_SOFTIRQ);
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raise_softirq(RCU_SOFTIRQ);
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per_cpu(rcu_dyntick_holdoff, cpu) = jiffies;
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}
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return c;
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return c;
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}
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}
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