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由 Liu Bo 提交于
The API in tree log code has done sort of changes, and it proves that we can benifit from using token, so do the same thing here. function_graph tracer's timer shows that it costs nearly half time of before(39.788us -> 22.391us). Signed-off-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
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