linux-kernel - Re: [PATCH v29 12/13] mm/damon: Add user space selftests

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Date:   Fri, 11 Jun 2021 14:04:27 +0000
From:   SeongJae Park <sj38.park@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     SeongJae Park <sj38.park@...il.com>, akpm@...ux-foundation.org,
        SeongJae Park <sjpark@...zon.de>, Jonathan.Cameron@...wei.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        amit@...nel.org, benh@...nel.crashing.org,
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        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v29 12/13] mm/damon: Add user space selftests

From: SeongJae Park <sjpark@...zon.de>

Hello Max,

> On Thu, 20 May 2021 07:56:28 +0000 SeongJae Park <sj38.park@...il.com> wrote:
> 
> > From: SeongJae Park <sjpark@...zon.de>
> > 
> > This commit adds a simple user space tests for DAMON.  The tests are
> > using kselftest framework.
> > 
> > Signed-off-by: SeongJae Park <sjpark@...zon.de>
> > ---
> >  tools/testing/selftests/damon/Makefile        |  7 ++
> >  .../selftests/damon/_chk_dependency.sh        | 28 ++++++
> >  .../testing/selftests/damon/debugfs_attrs.sh  | 98 +++++++++++++++++++
> >  3 files changed, 133 insertions(+)
> >  create mode 100644 tools/testing/selftests/damon/Makefile
> >  create mode 100644 tools/testing/selftests/damon/_chk_dependency.sh
> >  create mode 100755 tools/testing/selftests/damon/debugfs_attrs.sh
> > 
[...]
> > diff --git a/tools/testing/selftests/damon/debugfs_attrs.sh b/tools/testing/selftests/damon/debugfs_attrs.sh
> > new file mode 100755
> > index 000000000000..4a8ab4910ee4
> > --- /dev/null
> > +++ b/tools/testing/selftests/damon/debugfs_attrs.sh
> > @@ -0,0 +1,98 @@
> > +#!/bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +source ./_chk_dependency.sh
> > +
> > +# Test attrs file
> > +file="$DBGFS/attrs"
> > +
> > +ORIG_CONTENT=$(cat $file)
> 
> Missing quotes around $file. Can you run shellcheck on this code and fix all
> reportings, please?

Thanks for the nice suggestion.  I will do so in the next spin.

> 
> > +
> > +echo 1 2 3 4 5 > $file
> > +if [ $? -ne 0 ]
> > +then
> > +	echo "$file write failed"
> > +	echo $ORIG_CONTENT > $file
> > +	exit 1
> > +fi
> > +
> > +echo 1 2 3 4 > $file
> > +if [ $? -eq 0 ]
> > +then
> > +	echo "$file write success (should failed)"
> > +	echo $ORIG_CONTENT > $file
> > +	exit 1
> > +fi
> > +
> > +CONTENT=$(cat $file)
> > +if [ "$CONTENT" != "1 2 3 4 5" ]
> > +then
> > +	echo "$file not written"
> > +	echo $ORIG_CONTENT > $file
> > +	exit 1
> > +fi
> 
> I'd add test cases for the contents written to the attrs, like checking that
> input min_nr_regions is actually smaller than the input max_nr_regions values.

Good point.  Will add the test case in the next spin.

> 
> > +
> > +echo $ORIG_CONTENT > $file
> > +
> > +# Test target_ids file
> > +file="$DBGFS/target_ids"
> > +
> > +ORIG_CONTENT=$(cat $file)
> > +
> > +echo "1 2 3 4" > $file
> > +if [ $? -ne 0 ]
> > +then
> > +	echo "$file write fail"
> > +	echo $ORIG_CONTENT > $file
> > +	exit 1
> > +fi
> > +
> > +echo "1 2 abc 4" > $file
> > +if [ $? -ne 0 ]
> > +then
> > +	echo "$file write fail"
> > +	echo $ORIG_CONTENT > $file
> > +	exit 1
> > +fi
> 
> I've seen this construct more than once. Any chance to refactor this code? Or is
> this selftest not expected to grow in the future?

Good point.  Will modularize code for reducing duplicates.


Thanks,
SeongJae Park

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