| Message ID | 1339794370-28119-11-git-send-email-paulmck@linux.vnet.ibm.com |
|---|---|
| State | Superseded |
| Headers | show |
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 >
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)