lkml.org 
[lkml]   [2012]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH tip/core/rcu 11/15] rcu: Add rcu_barrier() statistics to debugfs tracing
On Fri, Jun 15, 2012 at 02:06:06PM -0700, Paul E. McKenney wrote:
> 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>

Reviewed-by: Josh Triplett <josh@joshtriplett.org>

> 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
>


\
 
 \ /
  Last update: 2012-06-16 02:21    [W:0.170 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site