Date:   Mon, 3 Jan 2022 16:00:37 +0800
From:   Leo Yan <leo.yan@linaro.org>
To:     carsten.haitzler@foss.arm.com
Cc:     linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
        suzuki.poulose@arm.com, mathieu.poirier@linaro.org,
        mike.leach@linaro.org, inux-perf-users@vger.kernel.org,
        acme@kernel.org
Subject: Re: [PATCH 07/12] perf test: Add simple bubblesort test for
 coresight aux data
Message-ID: <20220103080037.GB2660949@leoy-ThinkPad-X240s>
References: <20211215160403.69264-1-carsten.haitzler@foss.arm.com>
 <20211215160403.69264-7-carsten.haitzler@foss.arm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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In-Reply-To: <20211215160403.69264-7-carsten.haitzler@foss.arm.com>
Precedence: bulk

On Wed, Dec 15, 2021 at 04:03:58PM +0000, carsten.haitzler@foss.arm.com wrote:
> From: Carsten Haitzler <carsten.haitzler@arm.com>
> 
> This adds a simple bubblesort test that sorts small and large data
> sets to see if a sufficient mount of aux data is produced.

When review this patch set, I try to classify the testing cases into
below three types, and I hope a testing is designed to verify a specific
CoreSight feature and can fall into one of these three types:

- For the waypoint testing, e.g. the test case is used to test different
  branch instructions (direct or indirect branch, exception, etc);
- The config testing, we can rely on CoreSight configFS to configure
  the specific CoreSight working mode, e.g. using strobing mode for
  audoFDO [1];
- Verify if CoreSight driver works correctly with perf event
  framework, I think essentially the test case [2] is used for this
  purpose.

I know the bubble sort testing can give us more confidence to validate
the CoreSight tracing data for a complex sort algorithm, on the other
hand, bubble sort testing is essentially to test the way points.

For this reason, I think the case asm_pure_loop.S has covered the
testing for branch instructions, and if we want to cover more complete
waypoint testing, you could consider to extend asm_pure_loop.S file.

Furthermore, I expect the bubble sort is to be used for testing the
CoreSight configuration, e.g. it can be used to test for the strobing
mode (and for validation AutoFDO).

How about you think for this?

Thanks,
Leo

[1] https://www.kernel.org/doc/html/latest/trace/coresight/coresight-config.html#coresight-system-configuration-manager
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/tests/shell/test_arm_coresight.sh

> Signed-off-by: Carsten Haitzler <carsten.haitzler@arm.com>
> ---
>  .../shell/coresight_bubble_sort_random.sh     |   20 +
>  .../shell/coresight_bubble_sort_small.sh      |   20 +
>  .../perf/tests/shell/tools/coresight/Makefile |    3 +-
>  .../tools/coresight/bubble_sort/Makefile      |   31 +
>  .../tools/coresight/bubble_sort/bubble_sort.c |   89 +
>  .../coresight/bubble_sort/random_array.txt    | 1855 +++++++++++++++++
>  .../coresight/bubble_sort/small_array.txt     |   10 +
>  7 files changed, 2027 insertions(+), 1 deletion(-)
>  create mode 100755 tools/perf/tests/shell/coresight_bubble_sort_random.sh
>  create mode 100755 tools/perf/tests/shell/coresight_bubble_sort_small.sh
>  create mode 100644 tools/perf/tests/shell/tools/coresight/bubble_sort/Makefile
>  create mode 100644 tools/perf/tests/shell/tools/coresight/bubble_sort/bubble_sort.c
>  create mode 100644 tools/perf/tests/shell/tools/coresight/bubble_sort/random_array.txt
>  create mode 100644 tools/perf/tests/shell/tools/coresight/bubble_sort/small_array.txt
> 
> diff --git a/tools/perf/tests/shell/coresight_bubble_sort_random.sh b/tools/perf/tests/shell/coresight_bubble_sort_random.sh
> new file mode 100755
> index 000000000000..63567f8c4f8b
> --- /dev/null
> +++ b/tools/perf/tests/shell/coresight_bubble_sort_random.sh
> @@ -0,0 +1,20 @@
> +#!/bin/sh -e
> +# Coresight / Bubblesort Random Array
> +
> +# SPDX-License-Identifier: GPL-2.0
> +# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
> +
> +TEST="bubble_sort"
> +. $(dirname $0)/lib/coresight.sh
> +ARGS="$DIR/random_array.txt"
> +DATV="random"
> +DATA="$DATD/perf-$TEST-$DATV.data"
> +
> +echo $ARGS
> +
> +perf record $PERFRECOPT -o "$DATA" "$BIN" $ARGS
> +
> +perf_dump_aux_verify "$DATA" 4188 1630 1630
> +
> +err=$?
> +exit $err
> diff --git a/tools/perf/tests/shell/coresight_bubble_sort_small.sh b/tools/perf/tests/shell/coresight_bubble_sort_small.sh
> new file mode 100755
> index 000000000000..ac86d9973fba
> --- /dev/null
> +++ b/tools/perf/tests/shell/coresight_bubble_sort_small.sh
> @@ -0,0 +1,20 @@
> +#!/bin/sh -e
> +# Coresight / Bubblesort Small Array
> +
> +# SPDX-License-Identifier: GPL-2.0
> +# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
> +
> +TEST="bubble_sort"
> +. $(dirname $0)/lib/coresight.sh
> +ARGS="$DIR/small_array.txt"
> +DATV="small"
> +DATA="$DATD/perf-$TEST-$DATV.data"
> +
> +echo $ARGS
> +
> +perf record $PERFRECOPT -o "$DATA" "$BIN" $ARGS
> +
> +perf_dump_aux_verify "$DATA" 66 6 6
> +
> +err=$?
> +exit $err
> diff --git a/tools/perf/tests/shell/tools/coresight/Makefile b/tools/perf/tests/shell/tools/coresight/Makefile
> index 1edab729db76..49fa80d28df4 100644
> --- a/tools/perf/tests/shell/tools/coresight/Makefile
> +++ b/tools/perf/tests/shell/tools/coresight/Makefile
> @@ -6,7 +6,8 @@ include ../../../../../../tools/scripts/utilities.mak
>  
>  SUBDIRS = \
>  	asm_pure_loop \
> -	thread_loop
> +	thread_loop \
> +	bubble_sort
>  
>  all: $(SUBDIRS)
>  $(SUBDIRS):
> diff --git a/tools/perf/tests/shell/tools/coresight/bubble_sort/Makefile b/tools/perf/tests/shell/tools/coresight/bubble_sort/Makefile
> new file mode 100644
> index 000000000000..6b82854f9f2b
> --- /dev/null
> +++ b/tools/perf/tests/shell/tools/coresight/bubble_sort/Makefile
> @@ -0,0 +1,31 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Carsten Haitzler <carsten.haitzler@arm.com>, 2021
> +include ../Makefile.miniconfig
> +
> +BIN=bubble_sort
> +LIB=
> +
> +all: $(BIN)
> +
> +$(BIN): $(BIN).c
> +ifdef CORESIGHT
> +ifeq ($(ARCH),arm64)
> +	$(Q)$(CC) $(BIN).c -o $(BIN) $(LIB)
> +endif
> +endif
> +
> +install-tests: all
> +ifdef CORESIGHT
> +ifeq ($(ARCH),arm64)
> +	$(call QUIET_INSTALL, tests) \
> +		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)'; \
> +		$(INSTALL) $(BIN) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)/$(BIN)'; \
> +		$(INSTALL) random_array.txt '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)/random_array.txt'; \
> +		$(INSTALL) small_array.txt '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/tests/shell/tools/$(BIN)/small_array.txt'
> +endif
> +endif
> +
> +clean:
> +	$(Q)$(RM) -f $(BIN)
> +
> +.PHONY: all clean install-tests
> diff --git a/tools/perf/tests/shell/tools/coresight/bubble_sort/bubble_sort.c b/tools/perf/tests/shell/tools/coresight/bubble_sort/bubble_sort.c
> new file mode 100644
> index 000000000000..07169e03a803
> --- /dev/null
> +++ b/tools/perf/tests/shell/tools/coresight/bubble_sort/bubble_sort.c
> @@ -0,0 +1,89 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Andrea Brunato <andrea.brunato@arm.com>, 2021
> +// Example taken from: https://gcc.gnu.org/wiki/AutoFDO/Tutorial
> +
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <assert.h>
> +
> +int count_lines(FILE *fp)
> +{
> +	int lines_n = 0;
> +	char c;
> +
> +	for (c = getc(fp); !feof(fp); c = getc(fp)) {
> +		if (c == '\n')
> +			lines_n = lines_n + 1;
> +	}
> +	fseek(fp, 0, SEEK_SET);
> +#ifdef DEBUG
> +	printf("Number of lines: %d\n", lines_n);
> +#endif
> +	return lines_n;
> +}
> +
> +#ifdef DEBUG
> +void print_array(int *arr, int size)
> +{
> +	int i;
> +
> +	assert(arr != NULL);
> +	for (i = 0; i < size; i++)
> +		printf("%d\n", arr[i]);
> +}
> +#endif
> +
> +void bubble_sort(int *a, int n)
> +{
> +	int i, t, s = 1;
> +
> +	while (s) {
> +		s = 0;
> +		for (i = 1; i < n; i++) {
> +			if (a[i] < a[i - 1]) {
> +				t = a[i];
> +				a[i] = a[i - 1];
> +				a[i - 1] = t;
> +				s = 1;
> +			}
> +		}
> +	}
> +}
> +
> +void init_array(int *arr, int size, FILE *fp)
> +{
> +	int i;
> +
> +	for (i = 0; i < size; i++)
> +		fscanf(fp, "%d", &arr[i]);
> +}
> +
> +int main(int argc, char **argv)
> +{
> +	int lines_n = 0, *arr = NULL;
> +	FILE *fp;
> +
> +	assert((argc == 2) && "Please specify an input file\n");
> +
> +	fp = fopen(argv[1], "r");
> +	assert((fp != NULL) && "ERROR: Couldn't open the specified file\n");
> +
> +	// Input file expected formar: one number per line
> +	lines_n = count_lines(fp);
> +
> +	arr = malloc(sizeof(int) * lines_n);
> +	init_array(arr, lines_n, fp);
> +
> +	bubble_sort(arr, lines_n);
> +
> +#ifdef DEBUG
> +	print_array(arr, lines_n);
> +#endif
> +
> +	free(arr);
> +	fclose(fp);
> +
> +	return 0;
> +}
> +
> +
> diff --git a/tools/perf/tests/shell/tools/coresight/bubble_sort/random_array.txt b/tools/perf/tests/shell/tools/coresight/bubble_sort/random_array.txt
> new file mode 100644
> index 000000000000..d041cfb7a649
> --- /dev/null
> +++ b/tools/perf/tests/shell/tools/coresight/bubble_sort/random_array.txt
> @@ -0,0 +1,1855 @@
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> +11816
> +30277
> +25451
> +21547
> +2541
> +25816
> +29475
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> +14691
> +12591
> +18044
> +8909
> +25202
> +27953
> +23172
> +22914
> +6804
> +14234
> +12636
> +20760
> +21866
> +31846
> +17844
> +20014
> +21902
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> +24169
> +29553
> +14032
> +16076
> +5035
> +25992
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> +25090
> diff --git a/tools/perf/tests/shell/tools/coresight/bubble_sort/small_array.txt b/tools/perf/tests/shell/tools/coresight/bubble_sort/small_array.txt
> new file mode 100644
> index 000000000000..d351c8437d0a
> --- /dev/null
> +++ b/tools/perf/tests/shell/tools/coresight/bubble_sort/small_array.txt
> @@ -0,0 +1,10 @@
> +11637
> +3799
> +23116
> +15091
> +13022
> +15840
> +27029
> +27563
> +25641
> +28703
> -- 
> 2.32.0
>