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Creating the new log instances triggers a lot of python logging overhead in a commonly called function (about 600,000 for parsing OE-Core). We only need the log functionality if we're parsing, not if we just hit from the cache. Therefore defer the log setup overhead until we know it is a cache miss. Whilst this complicates the code slightly, the performance gain is worth it as for parsing OE-Core we drop 60 million funciton calls (from 225 overall). (Bitbake rev: ac868167ad854f9bb32dcb2e63528870547805a7) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>