rcu: Use DEFINE_PER_CPU_SHARED_ALIGNED for rcu_data

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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>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>

...

This commit is contained in:

Paul E. McKenney 2014-09-04 12:21:41 -07:00

parent 28ced795cb

commit 11bbb235c2

1 changed files with 1 additions and 1 deletions

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kernel/rcu/tree.c

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