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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_trace.c | |
| parent | e546f485e1d7520ca0200502cdcc11b503f4805c (diff) | |
| download | linux-394f99a9007d4274f7076bb8553ab0ff9707688b.tar.gz linux-394f99a9007d4274f7076bb8553ab0ff9707688b.tar.bz2 linux-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_trace.c')
| -rw-r--r-- | kernel/rcutree_trace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c index 36c95b45738e..458e032a3a30 100644 --- a/kernel/rcutree_trace.c +++ b/kernel/rcutree_trace.c @@ -262,7 +262,7 @@ static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp) struct rcu_data *rdp; for_each_possible_cpu(cpu) { - rdp = rsp->rda[cpu]; + rdp = per_cpu_ptr(rsp->rda, cpu); if (rdp->beenonline) print_one_rcu_pending(m, rdp); } |