perf tools: Limit ordered events queue size

Add limit to the ordered events queue allocation. This way we will be
able to control the size of the queue buffers.

There's no limit at the moment (it's set to (u64) -1). The config code
will come in following patches.

Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: David Ahern <[email protected]>
Cc: Corey Ashford <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jean Pihet <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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