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The insane QAPATHTESTs make many os.stat() calls, the majority of which are redundant with caching as the initial sweep does a stat() on every entry to determine if it is a file or a directory, and from then on each test that does further stat()s is redundant as the tree doesn't change. Switch os.stat() and friends (os.path.isfile(), etc) to use a common oe.cachedpath.CachedPath() instance that is shared between all of the functions, meaning only one stat is done. In my test case of ltp:do_package_qa, this reduces the time taken from 44s to 37s. (From OE-Core rev: cad3c889439fd6a007debd6f2f6578f4a1e16c9c) Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>