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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-02-27 14:53:07 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-28 09:17:42 +0100 |
| commit | 622ea685f1fafdf84d612440535c84341f0860b8 (patch) | |
| tree | 68363e9a5a408ac78488c8c19e918fb6b17b76a7 /kernel | |
| parent | 71da81324c83ef65bb196c7f874ac1c6996d8287 (diff) | |
| download | linux-622ea685f1fafdf84d612440535c84341f0860b8.tar.gz linux-622ea685f1fafdf84d612440535c84341f0860b8.tar.bz2 linux-622ea685f1fafdf84d612440535c84341f0860b8.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcutree_plugin.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 464ad2cdee00..79b53bda8943 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -1010,6 +1010,10 @@ int rcu_needs_cpu(int cpu) int c = 0; int thatcpu; + /* Check for being in the holdoff period. */ + if (per_cpu(rcu_dyntick_holdoff, cpu) == jiffies) + return rcu_needs_cpu_quick_check(cpu); + /* Don't bother unless we are the last non-dyntick-idle CPU. */ for_each_cpu_not(thatcpu, nohz_cpu_mask) if (thatcpu != cpu) { @@ -1041,10 +1045,8 @@ int rcu_needs_cpu(int cpu) } /* If RCU callbacks are still pending, RCU still needs this CPU. */ - if (c) { + if (c) raise_softirq(RCU_SOFTIRQ); - per_cpu(rcu_dyntick_holdoff, cpu) = jiffies; - } return c; } |