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authorMichael Wang <wangyun@linux.vnet.ibm.com>2012-09-20 08:51:04 +0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-08 11:50:16 -0800
commit878eda72e24d11e463a25b1dc7097a8d953f17cb (patch)
treec1e3196ade3e7d4aa02dbaacdd102d820439571b /kernel/rcutree_trace.c
parent374b928ee8061fdbb0b527fb3924080ba2437767 (diff)
downloadlinaro-lsk-878eda72e24d11e463a25b1dc7097a8d953f17cb.tar.gz
rcu: Optimize the 'rcudata' for RCU trace
This patch implements the new 'rcudata' interface under each rsp directory, by using the 'CPU units sequence reading', thus avoiding loss of tracing data. Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree_trace.c')
-rw-r--r--kernel/rcutree_trace.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 0dfe9b512f0..a11522f62c7 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -174,6 +174,32 @@ static const struct file_operations rcudata_fops = {
.release = single_release,
};
+static int new_show_rcudata(struct seq_file *m, void *v)
+{
+ print_one_rcu_data(m, (struct rcu_data *)v);
+ return 0;
+}
+
+static const struct seq_operations new_rcudate_op = {
+ .start = r_start,
+ .next = r_next,
+ .stop = r_stop,
+ .show = new_show_rcudata,
+};
+
+static int new_rcudata_open(struct inode *inode, struct file *file)
+{
+ return r_open(inode, file, &new_rcudate_op);
+}
+
+static const struct file_operations new_rcudata_fops = {
+ .owner = THIS_MODULE,
+ .open = new_rcudata_open,
+ .read = seq_read,
+ .llseek = no_llseek,
+ .release = seq_release,
+};
+
static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
{
if (!rdp->beenonline)
@@ -488,6 +514,11 @@ static int __init rcutree_trace_init(void)
rspdir = debugfs_create_dir(rsp->name, rcudir);
if (!rspdir)
goto free_out;
+
+ retval = debugfs_create_file("rcudata", 0444,
+ rspdir, rsp, &new_rcudata_fops);
+ if (!retval)
+ goto free_out;
}
retval = debugfs_create_file("rcubarrier", 0444, rcudir,