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rcu: Optimize the 'rcu_pending' for RCU trace

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This patch implements the new 'rcu_pending' interface under each rsp
directory, by using the 'CPU units sequence reading', thus avoiding loss
of tracing data.

Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Michael Wang
2012-09-20 08:51:06 +08:00
committed by Paul E. McKenney
parent d29200efa2
commit 51d0f16d49
1 changed files with 35 additions and 6 deletions
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41
kernel/rcutree_trace.c
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@@ -467,6 +467,8 @@ static const struct file_operations rcugp_fops = {
static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
{ {
if (!rdp->beenonline)
return;
seq_printf(m, "%3d%cnp=%ld ", seq_printf(m, "%3d%cnp=%ld ",
rdp->cpu, rdp->cpu,
cpu_is_offline(rdp->cpu) ? '!' : ' ', cpu_is_offline(rdp->cpu) ? '!' : ' ',
@@ -485,16 +487,12 @@ static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
static int show_rcu_pending(struct seq_file *m, void *unused) static int show_rcu_pending(struct seq_file *m, void *unused)
{ {
int cpu; int cpu;
struct rcu_data *rdp;
struct rcu_state *rsp; struct rcu_state *rsp;
for_each_rcu_flavor(rsp) { for_each_rcu_flavor(rsp) {
seq_printf(m, "%s:\n", rsp->name); seq_printf(m, "%s:\n", rsp->name);
for_each_possible_cpu(cpu) { for_each_possible_cpu(cpu)
rdp = per_cpu_ptr(rsp->rda, cpu); print_one_rcu_pending(m, per_cpu_ptr(rsp->rda, cpu));
if (rdp->beenonline)
print_one_rcu_pending(m, rdp);
}
} }
return 0; return 0;
} }
@@ -512,6 +510,32 @@ static const struct file_operations rcu_pending_fops = {
.release = single_release, .release = single_release,
}; };
static int new_show_rcu_pending(struct seq_file *m, void *v)
{
print_one_rcu_pending(m, (struct rcu_data *)v);
return 0;
}
static const struct seq_operations new_rcu_pending_op = {
.start = r_start,
.next = r_next,
.stop = r_stop,
.show = new_show_rcu_pending,
};
static int new_rcu_pending_open(struct inode *inode, struct file *file)
{
return r_open(inode, file, &new_rcu_pending_op);
}
static const struct file_operations new_rcu_pending_fops = {
.owner = THIS_MODULE,
.open = new_rcu_pending_open,
.read = seq_read,
.llseek = no_llseek,
.release = seq_release,
};
static int show_rcutorture(struct seq_file *m, void *unused) static int show_rcutorture(struct seq_file *m, void *unused)
{ {
seq_printf(m, "rcutorture test sequence: %lu %s\n", seq_printf(m, "rcutorture test sequence: %lu %s\n",
@@ -561,6 +585,11 @@ static int __init rcutree_trace_init(void)
rspdir, rsp, &new_rcudata_csv_fops); rspdir, rsp, &new_rcudata_csv_fops);
if (!retval) if (!retval)
goto free_out; goto free_out;
retval = debugfs_create_file("rcu_pending", 0444,
rspdir, rsp, &new_rcu_pending_fops);
if (!retval)
goto free_out;
} }
retval = debugfs_create_file("rcubarrier", 0444, rcudir, retval = debugfs_create_file("rcubarrier", 0444, rcudir,