Commit c8d77183 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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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: default avatarSteven Rostedt <rostedt@goodmis.org>
parent f0d2c681

kernel/trace/trace.c

+42 −0
Original line number Diff line number Diff line
@@ -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

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