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authorVaibhav Nagarnaik <vnagarnaik@google.com>2012-02-02 21:00:41 +0100
committerSteven Rostedt <rostedt@goodmis.org>2012-04-24 03:17:51 +0200
commit438ced1720b584000a9e8a4349d1f6bb7ee3ad6d (patch)
tree2c769e58411c68b298ab816c577ecb2119c7067c /kernel/trace/trace.h
parenttracing: Remove an unneeded check in trace_seq_buffer() (diff)
downloadlinux-438ced1720b584000a9e8a4349d1f6bb7ee3ad6d.tar.xz
linux-438ced1720b584000a9e8a4349d1f6bb7ee3ad6d.zip
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.h2
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;