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Subject[PATCH] ftrace: add a 'dropped events' counter
Date
The existing 'overrun' counter is incremented when the ring
buffer wraps around, with overflow on (the default). We wanted
a way to count requests lost from the buffer filling up with
overflow off, too. I decided to add a new counter instead
of retro-fitting the existing one because it seems like a
different statistic to count conceptually, and also because
of how the code was structured.

Signed-Off-By: Slava Pestov <slavapestov@google.com>
---
include/linux/ring_buffer.h | 1 +
kernel/trace/ring_buffer.c | 43 ++++++++++++++++++++++++++++++++++++-------
kernel/trace/trace.c | 3 +++
3 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index ab38ac8..a6dea58 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -159,6 +159,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu);
+unsigned long ring_buffer_dropped_events_cpu(struct ring_buffer *buffer, int cpu);

u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index b0c7aa4..393254e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -488,9 +488,10 @@ struct ring_buffer_per_cpu {
struct buffer_page *reader_page;
unsigned long lost_events;
unsigned long last_overrun;
- local_t commit_overrun;
- local_t overrun;
local_t entries;
+ local_t overrun;
+ local_t commit_overrun;
+ local_t dropped_events;
local_t committing;
local_t commits;
unsigned long read;
@@ -1941,8 +1942,10 @@ rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer,
* If we are not in overwrite mode,
* this is easy, just stop here.
*/
- if (!(buffer->flags & RB_FL_OVERWRITE))
- goto out_reset;
+ if (!(buffer->flags & RB_FL_OVERWRITE)) {
+ local_inc(&cpu_buffer->dropped_events);
+ goto out_reset;
+ }

ret = rb_handle_head_page(cpu_buffer,
tail_page,
@@ -2665,7 +2668,8 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);

/**
- * ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
+ * ring_buffer_overrun_cpu - get the number of overruns caused by the ring
+ * buffer wrapping around (only if RB_FL_OVERWRITE is on).
* @buffer: The ring buffer
* @cpu: The per CPU buffer to get the number of overruns from
*/
@@ -2685,7 +2689,9 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);

/**
- * ring_buffer_commit_overrun_cpu - get the number of overruns caused by commits
+ * ring_buffer_commit_overrun_cpu - get the number of overruns caused by
+ * commits failing due to the buffer wrapping around while there are uncommitted
+ * events, such as during an interrupt storm.
* @buffer: The ring buffer
* @cpu: The per CPU buffer to get the number of overruns from
*/
@@ -2706,6 +2712,28 @@ ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu)
EXPORT_SYMBOL_GPL(ring_buffer_commit_overrun_cpu);

/**
+ * ring_buffer_dropped_events_cpu - get the number of dropped events caused by
+ * the ring buffer filling up (only if RB_FL_OVERWRITE is off).
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long
+ring_buffer_dropped_events_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long ret;
+
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
+ return 0;
+
+ cpu_buffer = buffer->buffers[cpu];
+ ret = local_read(&cpu_buffer->dropped_events);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_dropped_events_cpu);
+
+/**
* ring_buffer_entries - get the number of entries in a buffer
* @buffer: The ring buffer
*
@@ -3512,8 +3540,9 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
local_set(&cpu_buffer->reader_page->page->commit, 0);
cpu_buffer->reader_page->read = 0;

- local_set(&cpu_buffer->commit_overrun, 0);
local_set(&cpu_buffer->overrun, 0);
+ local_set(&cpu_buffer->commit_overrun, 0);
+ local_set(&cpu_buffer->dropped_events, 0);
local_set(&cpu_buffer->entries, 0);
local_set(&cpu_buffer->committing, 0);
local_set(&cpu_buffer->commits, 0);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ee9c921..fe8c1d3 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3939,6 +3939,9 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
trace_seq_printf(s, "commit overrun: %ld\n", cnt);

+ cnt = ring_buffer_dropped_events_cpu(tr->buffer, cpu);
+ trace_seq_printf(s, "dropped events: %ld\n", cnt);
+
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);

kfree(s);
--
1.7.3.1


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