tree d6bdd3384a063d7c58ae807a310ecc80cb91773b
parent 8aabee573dff131a085c63de7667eacd94ba4ccb
author Steven Rostedt <srostedt@redhat.com> 1236880405 -0400
committer Steven Rostedt <srostedt@redhat.com> 1236906899 -0400

tracing: show that buffer size is not expanded

Impact: do not confuse user on small trace buffer sizes

When the system boots up, the trace buffer is small to conserve memory.
It is only two pages per online CPU. When the tracer is used, it expands
to the default value.

This can confuse the user if they look at the buffer size and see only
7, but then later they see 1408.

 # cat /debug/tracing/buffer_size_kb
7

 # echo sched_switch > /debug/tracing/current_tracer

 # cat /debug/tracing/buffer_size_kb
1408

This patch tries to help remove this confustion by showing that the
buffer has not been expanded.

 # cat /debug/tracing/buffer_size_kb
7 (expanded: 1408)

Signed-off-by: Steven Rostedt <srostedt@redhat.com>