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Commit d29200ef authored by Michael Wang's avatar Michael Wang Committed by Paul E. McKenney
Browse files

rcu: Optimize the 'rcudata.csv' for RCU trace 



This patch implements the new 'rcudata.csv' 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 878eda72

kernel/rcutree_trace.c

+42 −0
Original line number Diff line number Diff line
@@ -267,6 +267,43 @@ static const struct file_operations rcudata_csv_fops = { 
	.release = single_release,

};



static int new_show_rcudata_csv(struct seq_file *m, void *v)

{

	struct rcu_data *rdp = (struct rcu_data *)v;

	if (cpumask_first(cpu_possible_mask) == rdp->cpu) {

		seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");

		seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");

		seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");

#ifdef CONFIG_RCU_BOOST

		seq_puts(m, "\"kt\",\"ktl\"");

#endif /* #ifdef CONFIG_RCU_BOOST */

		seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");

	}



	print_one_rcu_data_csv(m, rdp);

	return 0;

}



static const struct seq_operations new_rcudate_csv_op = {

	.start = r_start,

	.next  = r_next,

	.stop  = r_stop,

	.show  = new_show_rcudata_csv,

};



static int new_rcudata_csv_open(struct inode *inode, struct file *file)

{

	return r_open(inode, file, &new_rcudate_csv_op);

}



static const struct file_operations new_rcudata_csv_fops = {

	.owner = THIS_MODULE,

	.open = new_rcudata_csv_open,

	.read = seq_read,

	.llseek = no_llseek,

	.release = seq_release,

};



#ifdef CONFIG_RCU_BOOST



static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
@@ -519,6 +556,11 @@ static int __init rcutree_trace_init(void) 
					rspdir, rsp, &new_rcudata_fops);

			if (!retval)

				goto free_out;



			retval = debugfs_create_file("rcudata.csv", 0444,

					rspdir, rsp, &new_rcudata_csv_fops);

			if (!retval)

				goto free_out;

	}



	retval = debugfs_create_file("rcubarrier", 0444, rcudir,