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tracing: export stats of ring buffers to userspace 

This patch adds stats to the ftrace ring buffers:

 # cat /debugfs/tracing/per_cpu/cpu0/stats
 entries: 42360
 overrun: 30509326
 commit overrun: 0
 nmi dropped: 0

Where entries are the total number of data entries in the buffer.

overrun is the number of entries not consumed and were overwritten by
the writer.

commit overrun is the number of entries dropped due to nested writers
wrapping the buffer before the initial writer finished the commit.

nmi dropped is the number of entries dropped due to the ring buffer
lock being held when an nmi was going to write to the ring buffer.
Note, this field will be meaningless and will go away when the ring
buffer becomes lockless.

[ Impact: let userspace know what is happening in the ring buffers ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-04-29 18:03:45 -04:00 committed by Steven Rostedt
parent f0d2c681ac
commit c8d771835e
1 changed files with 42 additions and 0 deletions
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42
kernel/trace/trace.c
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@ -3595,6 +3595,45 @@ static const struct file_operations tracing_buffers_fops = {
.llseek = no_llseek,
};
static ssize_t
tracing_stats_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *ppos)
{
unsigned long cpu = (unsigned long)filp->private_data;
struct trace_array *tr = &global_trace;
struct trace_seq *s;
unsigned long cnt;
s = kmalloc(sizeof(*s), GFP_ATOMIC);
if (!s)
return ENOMEM;
trace_seq_init(s);
cnt = ring_buffer_entries_cpu(tr->buffer, cpu);
trace_seq_printf(s, "entries: %ld\n", cnt);
cnt = ring_buffer_overrun_cpu(tr->buffer, cpu);
trace_seq_printf(s, "overrun: %ld\n", cnt);
cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
trace_seq_printf(s, "commit overrun: %ld\n", cnt);
cnt = ring_buffer_nmi_dropped_cpu(tr->buffer, cpu);
trace_seq_printf(s, "nmi dropped: %ld\n", cnt);
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
kfree(s);
return count;
}
static const struct file_operations tracing_stats_fops = {
.open = tracing_open_generic,
.read = tracing_stats_read,
};
#ifdef CONFIG_DYNAMIC_FTRACE
int __weak ftrace_arch_read_dyn_info(char *buf, int size)
@ -3708,6 +3747,9 @@ static void tracing_init_debugfs_percpu(long cpu)
trace_create_file("trace_pipe_raw", 0444, d_cpu,
(void *) cpu, &tracing_buffers_fops);
trace_create_file("stats", 0444, d_cpu,
(void *) cpu, &tracing_stats_fops);
}
#ifdef CONFIG_FTRACE_SELFTEST