rcu: Add tracing for synchronize_sched_expedited()
This commit adds a per-RCU-flavor "rcuexp" file that dumps out statistics for synchonize_sched_expedited(). Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -173,6 +173,38 @@ static const struct file_operations rcudata_fops = {
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.release = seq_release,
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.release = seq_release,
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};
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};
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static int show_rcuexp(struct seq_file *m, void *v)
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{
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struct rcu_state *rsp = (struct rcu_state *)m->private;
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seq_printf(m, "s=%lu d=%lu w=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu dt=%lu dl=%lu dx=%lu\n",
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atomic_long_read(&rsp->expedited_start),
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atomic_long_read(&rsp->expedited_done),
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atomic_long_read(&rsp->expedited_wrap),
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atomic_long_read(&rsp->expedited_tryfail),
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atomic_long_read(&rsp->expedited_workdone1),
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atomic_long_read(&rsp->expedited_workdone2),
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atomic_long_read(&rsp->expedited_normal),
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atomic_long_read(&rsp->expedited_stoppedcpus),
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atomic_long_read(&rsp->expedited_done_tries),
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atomic_long_read(&rsp->expedited_done_lost),
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atomic_long_read(&rsp->expedited_done_exit));
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return 0;
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}
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static int rcuexp_open(struct inode *inode, struct file *file)
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{
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return single_open(file, show_rcuexp, inode->i_private);
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}
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static const struct file_operations rcuexp_fops = {
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.owner = THIS_MODULE,
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.open = rcuexp_open,
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.read = seq_read,
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.llseek = no_llseek,
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.release = seq_release,
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};
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#ifdef CONFIG_RCU_BOOST
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#ifdef CONFIG_RCU_BOOST
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static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
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static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
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@ -405,6 +437,11 @@ static int __init rcutree_trace_init(void)
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if (!retval)
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if (!retval)
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goto free_out;
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goto free_out;
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retval = debugfs_create_file("rcuexp", 0444,
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rspdir, rsp, &rcuexp_fops);
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if (!retval)
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goto free_out;
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retval = debugfs_create_file("rcu_pending", 0444,
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retval = debugfs_create_file("rcu_pending", 0444,
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rspdir, rsp, &rcu_pending_fops);
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rspdir, rsp, &rcu_pending_fops);
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if (!retval)
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if (!retval)
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