Commit e9664b96 authored by Carsten Haitzler's avatar Carsten Haitzler Committed by Arnaldo Carvalho de Melo
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perf test coresight: Add thread loop test tool 



Add test tool to be driven by further test scripts. This is a simple C
based loop with threads test to drive from scripts that can output TIDs
for tracking/checking.

Reviewed-by: default avatarJames Clark <james.clark@arm.com>
Signed-off-by: default avatarCarsten Haitzler <carsten.haitzler@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Link: https://lore.kernel.org/r/20220909152803.2317006-9-carsten.haitzler@foss.arm.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b76692fe

tools/perf/tests/shell/coresight/Makefile

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@@ -6,7 +6,8 @@ include ../../../../../tools/scripts/utilities.mak 


SUBDIRS = \

	asm_pure_loop \

	memcpy_thread

	memcpy_thread \

	thread_loop



all: $(SUBDIRS)

$(SUBDIRS):

tools/perf/tests/shell/coresight/thread_loop/.gitignore

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thread_loop

tools/perf/tests/shell/coresight/thread_loop/Makefile

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# SPDX-License-Identifier: GPL-2.0

# Carsten Haitzler <carsten.haitzler@arm.com>, 2021

include ../Makefile.miniconfig



# Binary to produce

BIN=thread_loop

# Any linking/libraries needed for the binary - empty if none needed

LIB=-pthread



all: $(BIN)



$(BIN): $(BIN).c

ifdef CORESIGHT

ifeq ($(ARCH),arm64)

# Build line

	$(Q)$(CC) $(BIN).c -o $(BIN) $(LIB)

endif

endif



install-tests: all

ifdef CORESIGHT

ifeq ($(ARCH),arm64)

# Install the test tool in the right place

	$(call QUIET_INSTALL, tests) \

		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/$(INSTDIR_SUB)/$(BIN)'; \

		$(INSTALL) $(BIN) '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/$(INSTDIR_SUB)/$(BIN)/$(BIN)'

endif

endif



clean:

	$(Q)$(RM) -f $(BIN)



.PHONY: all clean install-tests

tools/perf/tests/shell/coresight/thread_loop/thread_loop.c

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// SPDX-License-Identifier: GPL-2.0

// Carsten Haitzler <carsten.haitzler@arm.com>, 2021



// define this for gettid()

#define _GNU_SOURCE



#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <pthread.h>

#include <sys/syscall.h>

#ifndef SYS_gettid

// gettid is 178 on arm64

# define SYS_gettid 178

#endif

#define gettid() syscall(SYS_gettid)



struct args {

	unsigned int loops;

	pthread_t th;

	void *ret;

};



static void *thrfn(void *arg)

{

	struct args *a = arg;

	int i = 0, len = a->loops;



	if (getenv("SHOW_TID")) {

		unsigned long long tid = gettid();



		printf("%llu\n", tid);

	}

	asm volatile(

		"loop:\n"

		"add %[i], %[i], #1\n"

		"cmp %[i], %[len]\n"

		"blt loop\n"

		: /* out */

		: /* in */ [i] "r" (i), [len] "r" (len)

		: /* clobber */

	);

	return (void *)(long)i;

}



static pthread_t new_thr(void *(*fn) (void *arg), void *arg)

{

	pthread_t t;

	pthread_attr_t attr;



	pthread_attr_init(&attr);

	pthread_create(&t, &attr, fn, arg);

	return t;

}



int main(int argc, char **argv)

{

	unsigned int i, len, thr;

	pthread_t threads[256];

	struct args args[256];



	if (argc < 3) {

		printf("ERR: %s [numthreads] [numloops (millions)]\n", argv[0]);

		exit(1);

	}



	thr = atoi(argv[1]);

	if ((thr < 1) || (thr > 256)) {

		printf("ERR: threads 1-256\n");

		exit(1);

	}

	len = atoi(argv[2]);

	if ((len < 1) || (len > 4000)) {

		printf("ERR: max loops 4000 (millions)\n");

		exit(1);

	}

	len *= 1000000;

	for (i = 0; i < thr; i++) {

		args[i].loops = len;

		args[i].th = new_thr(thrfn, &(args[i]));

	}

	for (i = 0; i < thr; i++)

		pthread_join(args[i].th, &(args[i].ret));

	return 0;

}