GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-02 20:29:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

ring-buffer: Add stats field for amount read from trace ring buffer

Browse source 
Add a stat about the number of events read from the ring buffer:

 #  cat /debug/tracing/per_cpu/cpu0/stats
entries: 39869
overrun: 870512
commit overrun: 0
bytes: 1449912
oldest event ts:  6561.368690
now ts:  6565.246426
dropped events: 0
read events: 112    <-- Added

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-01-29 17:45:49 -05:00 • committed by Steven Rostedt
parent 03274a3ffb
commit ad964704ba
3 changed files with 22 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

18
kernel/trace/ring_buffer.c
View file

@ -3102,6 +3102,24 @@ ring_buffer_dropped_events_cpu(struct ring_buffer *buffer, int cpu)
}
EXPORT_SYMBOL_GPL(ring_buffer_dropped_events_cpu);
/**
* ring_buffer_read_events_cpu - get the number of events successfully read
* @buffer: The ring buffer
* @cpu: The per CPU buffer to get the number of events read
*/
unsigned long
ring_buffer_read_events_cpu(struct ring_buffer *buffer, int cpu)
{
struct ring_buffer_per_cpu *cpu_buffer;
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->read;
}
EXPORT_SYMBOL_GPL(ring_buffer_read_events_cpu);
/**
* ring_buffer_entries - get the number of entries in a buffer
* @buffer: The ring buffer