linux-kernel - Re: [PATCH v2] kselftest: dt: Stop relying on dirname to improve performance

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Message-ID: <20240122154043.GC601827-robh@kernel.org>
Date: Mon, 22 Jan 2024 09:40:43 -0600
From: Rob Herring <robh@...nel.org>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Cc: Shuah Khan <shuah@...nel.org>, Frank Rowand <frowand.list@...il.com>,
	devicetree@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...labora.com,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2] kselftest: dt: Stop relying on dirname to improve
 performance

On Mon, Jan 22, 2024 at 11:29:18AM -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 drastically decreases 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.
> 
> This change has a side-effect, which is that the root DT node now
> also shows in the output, even though it isn't expected to bind to a
> driver. However there shouldn't be a matching driver for the board
> compatible, so the end result will be just an extra skipped test:
> 
> ok 1 / # SKIP
> 
> Reported-by: Mark Brown <broonie@...nel.org>
> Closes: https://lore.kernel.org/all/310391e8-fdf2-4c2f-a680-7744eb685177@sirena.org.uk
> Fixes: 14571ab1ad21 ("kselftest: Add new test for detecting unprobed Devicetree devices")
> Tested-by: Mark Brown <broonie@...nel.org>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
> Changes in v2:
> - Tweaked commit message
> - Added trailer tags
> - Rebased on 6.8-rc1
> ---
>  tools/testing/selftests/dt/test_unprobed_devices.sh | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)

Applied, thanks.

Rob