diff options
| author | Vaibhav Nagarnaik <vnagarnaik@google.com> | 2012-02-03 00:00:41 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-04-24 05:17:51 +0400 |
| commit | 438ced1720b584000a9e8a4349d1f6bb7ee3ad6d (patch) | |
| tree | 2c769e58411c68b298ab816c577ecb2119c7067c /kernel/trace/trace.h | |
| parent | 5a26c8f0cf1e95106858bb4e23ca6dd14c9b842f (diff) | |
| download | linux-438ced1720b584000a9e8a4349d1f6bb7ee3ad6d.tar.xz | |
ring-buffer: Add per_cpu ring buffer control files
Add a debugfs entry under per_cpu/ folder for each cpu called
buffer_size_kb to control the ring buffer size for each CPU
independently.
If the global file buffer_size_kb is used to set size, the individual
ring buffers will be adjusted to the given size. The buffer_size_kb will
report the common size to maintain backward compatibility.
If the buffer_size_kb file under the per_cpu/ directory is used to
change buffer size for a specific CPU, only the size of the respective
ring buffer is updated. When tracing/buffer_size_kb is read, it reports
'X' to indicate that sizes of per_cpu ring buffers are not equivalent.
Link: http://lkml.kernel.org/r/1328212844-11889-1-git-send-email-vnagarnaik@google.com
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Michael Rubin <mrubin@google.com>
Cc: David Sharp <dhsharp@google.com>
Cc: Justin Teravest <teravest@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f9d85504f04b..1c8b7c6f7b3b 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -131,6 +131,7 @@ struct trace_array_cpu { atomic_t disabled; void *buffer_page; /* ring buffer spare */ + unsigned long entries; unsigned long saved_latency; unsigned long critical_start; unsigned long critical_end; @@ -152,7 +153,6 @@ struct trace_array_cpu { */ struct trace_array { struct ring_buffer *buffer; - unsigned long entries; int cpu; int buffer_disabled; cycle_t time_start; |