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Commit 878eda72 authored by Michael Wang's avatar Michael Wang Committed by Paul E. McKenney
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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: default avatarMichael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 374b928e

kernel/rcutree_trace.c

+31 −0
Original line number Diff line number Diff line
@@ -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,