ring-buffer: Use sync sched protection on ring buffer resizing
authorSteven Rostedt <srostedt@redhat.com>
Fri, 11 Dec 2009 03:54:27 +0000 (22:54 -0500)
committerSteven Rostedt <rostedt@goodmis.org>
Fri, 11 Dec 2009 03:54:27 +0000 (22:54 -0500)
commit184210154b9aa570099183f6c062ac4eb11190b7
tree8951abcbd66eb5e198e340013b87138c2ff8d7fa
parentd954fbf0ff6b5fdfb32350e85a2f15d3db976506
ring-buffer: Use sync sched protection on ring buffer resizing

There was a comment in the ring buffer code that says the calling
layers should prevent tracing or reading of the ring buffer while
resizing. I have discovered that the tracers do not honor this
arrangement.

This patch moves the disabling and synchronizing the ring buffer to
a higher layer during resizing. This guarantees that no writes
are occurring while the resize takes place.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
kernel/trace/ring_buffer.c