tree 8ecbe4eae825ea4f7bbb685cab5a45206d437f05
parent a36bf32e9e8a86f291f746b7f8292e042ee04a46
author Andi Kleen <andi@firstfloor.org> 1270084645 +0200
committer Robert Richter <robert.richter@amd.com> 1272029438 +0200

oprofile: remove double ring buffering

oprofile used a double buffer scheme for its cpu event buffer
to avoid races on reading with the old locked ring buffer.

But that is obsolete now with the new ring buffer, so simply
use a single buffer. This greatly simplifies the code and avoids
a lot of sample drops on large runs, especially with call graph.

Based on suggestions from Steven Rostedt

For stable kernels from v2.6.32, but not earlier.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Robert Richter <robert.richter@amd.com>