perf tools: Flush ordered events in case of allocation failure

In previous patches we added a limit for ordered events queue allocation
size. If we reach this size we need to flush (part of) the queue to get
some free buffers.

The current functionality is not affected, because the limit is hard
coded to (u64) -1. The configuration code for size 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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