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    Subject[PATCH tip/core/rcu 11/15] rcu: Add rcu_barrier() statistics to debugfs tracing
    Date
    From: "Paul E. McKenney" <paul.mckenney@linaro.org>

    This commit adds an rcubarrier file to RCU's debugfs statistical tracing
    directory, providing diagnostic information on rcu_barrier().

    Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    kernel/rcutree_trace.c | 39 +++++++++++++++++++++++++++++++++++++++
    1 files changed, 39 insertions(+), 0 deletions(-)

    diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
    index a3556a2..057408b 100644
    --- a/kernel/rcutree_trace.c
    +++ b/kernel/rcutree_trace.c
    @@ -46,6 +46,40 @@
    #define RCU_TREE_NONCORE
    #include "rcutree.h"

    +static void print_rcubarrier(struct seq_file *m, struct rcu_state *rsp)
    +{
    + seq_printf(m, "%c bcc: %d nbd: %lu\n",
    + rsp->rcu_barrier_in_progress ? 'B' : '.',
    + atomic_read(&rsp->barrier_cpu_count),
    + rsp->n_barrier_done);
    +}
    +
    +static int show_rcubarrier(struct seq_file *m, void *unused)
    +{
    +#ifdef CONFIG_TREE_PREEMPT_RCU
    + seq_puts(m, "rcu_preempt: ");
    + print_rcubarrier(m, &rcu_preempt_state);
    +#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
    + seq_puts(m, "rcu_sched: ");
    + print_rcubarrier(m, &rcu_sched_state);
    + seq_puts(m, "rcu_bh: ");
    + print_rcubarrier(m, &rcu_bh_state);
    + return 0;
    +}
    +
    +static int rcubarrier_open(struct inode *inode, struct file *file)
    +{
    + return single_open(file, show_rcubarrier, NULL);
    +}
    +
    +static const struct file_operations rcubarrier_fops = {
    + .owner = THIS_MODULE,
    + .open = rcubarrier_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    #ifdef CONFIG_RCU_BOOST

    static char convert_kthread_status(unsigned int kthread_status)
    @@ -453,6 +487,11 @@ static int __init rcutree_trace_init(void)
    if (!rcudir)
    goto free_out;

    + retval = debugfs_create_file("rcubarrier", 0444, rcudir,
    + NULL, &rcubarrier_fops);
    + if (!retval)
    + goto free_out;
    +
    retval = debugfs_create_file("rcudata", 0444, rcudir,
    NULL, &rcudata_fops);
    if (!retval)
    --
    1.7.8


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