Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 02/10] rcu: Use DEFINE_PER_CPU_SHARED_ALIGNED for rcu_data | Date | Tue, 28 Oct 2014 14:53:29 -0700 |
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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
The rcu_data per-CPU variable has a number of fields that are atomically manipulated, potentially by any CPU. This situation can result in false sharing with per-CPU variables that have the misfortune of being allocated adjacent to rcu_data in memory. This commit therefore changes the DEFINE_PER_CPU() to DEFINE_PER_CPU_SHARED_ALIGNED() in order to avoid this false sharing.
Reported-by: Christoph Lameter <cl@linux.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Christoph Lameter <cl@linux.com> --- kernel/rcu/tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c0673c56fb1a..ab6fcfb4fe11 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -105,7 +105,7 @@ struct rcu_state sname##_state = { \ .name = RCU_STATE_NAME(sname), \ .abbr = sabbr, \ }; \ -DEFINE_PER_CPU(struct rcu_data, sname##_data) +DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, sname##_data) RCU_STATE_INITIALIZER(rcu_sched, 's', call_rcu_sched); RCU_STATE_INITIALIZER(rcu_bh, 'b', call_rcu_bh); -- 1.8.1.5
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