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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2010-06-28 16:25:04 +0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-08-19 17:18:01 -0700 |
| commit | 394f99a9007d4274f7076bb8553ab0ff9707688b (patch) | |
| tree | 7d379f91321cec58b87fd5f5089947872689d591 /kernel/rcutree.h | |
| parent | e546f485e1d7520ca0200502cdcc11b503f4805c (diff) | |
| download | lwn-394f99a9007d4274f7076bb8553ab0ff9707688b.tar.gz lwn-394f99a9007d4274f7076bb8553ab0ff9707688b.zip | |
rcu: simplify the usage of percpu data
&percpu_data is compatible with allocated percpu data.
And we use it and remove the "->rda[NR_CPUS]" array, saving significant
storage on systems with large numbers of CPUs. This does add an additional
level of indirection and thus an additional cache line referenced, but
because ->rda is not used on the read side, this is OK.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 14c040b18ed0..5ce197e87792 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -283,7 +283,7 @@ struct rcu_state { struct rcu_node *level[NUM_RCU_LVLS]; /* Hierarchy levels. */ u32 levelcnt[MAX_RCU_LVLS + 1]; /* # nodes in each level. */ u8 levelspread[NUM_RCU_LVLS]; /* kids/node in each level. */ - struct rcu_data *rda[NR_CPUS]; /* array of rdp pointers. */ + struct rcu_data __percpu *rda; /* pointer of percu rcu_data. */ /* The following fields are guarded by the root rcu_node's lock. */ |