Message-ID: <5b46181f-2162-e07d-c142-e257583daee8@foss.arm.com>
Date:   Tue, 4 Jan 2022 15:13:08 +0000
From:   Carsten Haitzler <carsten.haitzler@...s.arm.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
        suzuki.poulose@....com, mathieu.poirier@...aro.org,
        mike.leach@...aro.org, inux-perf-users@...r.kernel.org,
        acme@...nel.org
Subject: Re: [PATCH 07/12] perf test: Add simple bubblesort test for coresight
 aux data



On 1/3/22 08:00, Leo Yan wrote:
> On Wed, Dec 15, 2021 at 04:03:58PM +0000, carsten.haitzler@...s.arm.com wrote:
>> From: Carsten Haitzler <carsten.haitzler@....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?

I actually didn't include any autofdo testing as this was mostly a 
matter of tooling after you have collected a trace. Run through the 
trace data and then build up a good image of the execution of the target 
and that would probably belong in tooling outside of the kernel. The 
idea here was to see if we do collect sufficient amounts of data and 
that the data looks "sane". This is all about looking to see if we only 
get a single block or only 2 or 3 blocks then it stops or no blocks and 
then with various stresses on kernel (memory heavy, cpu heavy) to see if 
anything will greatly affect this.

The bubble sort does allow a basis to build some fdo tests on, but 
having a baseline of "does it collect data at all" to start with is a 
good call. I had not tested the strobing yet as that was probably 
another phase in this. Most of this was about getting the core 
infrastructure in to be able to add lots of little test tools we can run 
and the harnesses to run them and collect statistical data over time.

Just a side note - the asm loop is arm64 specific and thus it's good for 
testing an exact result from, but bubble sort is portable. It would 
allow us to use this for an Arm  64 platform like the Morello board. 
I've been keeping in mind "be somewhat portable" for this reason.

The only downside of keeping this test I think is that the whole test 
suite takes a bit longer to run. Is this sufficient a concern to remove 
this test from the patchset given the above?

> 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@....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@....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@....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@....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@....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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>> +9399
>> +16561
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>> +11372
>> +14820
>> +1120
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>> +25363
>> +17657
>> +3996
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>> +7050
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>> +10522
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>> +5294
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>> +5995
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>> +23151
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>> +28665
>> +4636
>> +14509
>> +11355
>> +12011
>> +7781
>> +21985
>> +29915
>> +29324
>> +6290
>> +15154
>> +29132
>> +11290
>> +522
>> +5120
>> +20375
>> +25145
>> +11202
>> +29750
>> +15947
>> +26516
>> +22990
>> +7319
>> +20231
>> +10644
>> +27608
>> +21434
>> +32345
>> +18927
>> +6568
>> +9749
>> +31987
>> +23632
>> +21696
>> +9666
>> +2040
>> +2134
>> +2242
>> +5559
>> +27430
>> +20952
>> +192
>> +31554
>> +18837
>> +11816
>> +30277
>> +25451
>> +21547
>> +2541
>> +25816
>> +29475
>> +16232
>> +1700
>> +19817
>> +21906
>> +14691
>> +12591
>> +18044
>> +8909
>> +25202
>> +27953
>> +23172
>> +22914
>> +6804
>> +14234
>> +12636
>> +20760
>> +21866
>> +31846
>> +17844
>> +20014
>> +21902
>> +15389
>> +24169
>> +29553
>> +14032
>> +16076
>> +5035
>> +25992
>> +25029
>> +4317
>> +16615
>> +20427
>> +24495
>> +11357
>> +12509
>> +8751
>> +24526
>> +11103
>> +6514
>> +27064
>> +23387
>> +25860
>> +7862
>> +29519
>> +32038
>> +5185
>> +30944
>> +24886
>> +17154
>> +31396
>> +30740
>> +8150
>> +27337
>> +28106
>> +8701
>> +16534
>> +32519
>> +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
>>

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