On Fri, Dec 08, 2023 at 10:39:27AM -0300, Nícolas F. R. A. Prado wrote:
When walking directory trees, instead of looking for specific files and running dirname to get the parent folder, traverse all folders and ignore the ones not containing the desired files. This avoids the need to call dirname inside the loop, which gives a big performance boost, approximately halving run time: Running locally on a mt8192-asurada-spherion, which reports 160 test cases, has gone from 5.5s to 2.9s, while running remotely with an nfsroot has gone from 13.5s to 5.5s.
It's hard to be sure exactly since the runtime is a bit variable but it does look like this is running substantially faster on the test systems I have that were most affected by the slowdown, looks like approximately a quarter of the time, and all the tests that were present before seem to still be present.
Tested-by: Mark Brown broonie@kernel.org