diff options
| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-04 12:21:41 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-11-03 19:20:03 -0800 |
| commit | 11bbb235c26f93b7c69e441452e44adbf6ed6996 (patch) | |
| tree | fbb0889e0a86daf78272f16487a7682fe9cc0117 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | rcu: Remove rcu_dynticks * parameters when they are always this_cpu_ptr(&rcu_dynticks) (diff) | |
| download | linux-dev-11bbb235c26f93b7c69e441452e44adbf6ed6996.tar.xz linux-dev-11bbb235c26f93b7c69e441452e44adbf6ed6996.zip | |
rcu: Use DEFINE_PER_CPU_SHARED_ALIGNED for rcu_data
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>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions