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authorNamhyung Kim <namhyung@kernel.org>2022-11-17 00:38:49 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-11-23 14:26:27 +0100
commit39281709a6e2301ac4c6ac7015c7793392ca2dfe (patch)
treebf8d94e95bbc24af9a18e79befc52f2b6dcf501e /tools/perf/tests
parentperf test: Replace arm callgraph fp test workload with leafloop (diff)
downloadlinux-39281709a6e2301ac4c6ac7015c7793392ca2dfe.tar.xz
linux-39281709a6e2301ac4c6ac7015c7793392ca2dfe.zip
perf test: Add 'sqrtloop' test workload
The sqrtloop creates a child process to run an infinite loop calling sqrt() with rand(). This is needed for ARM SPE fork test. $ perf test -w sqrtloop It can take an optional argument to specify how long it will run in seconds (default: 1). Committer notes: Explicitely ignored the sqrt() return to fix the build on systems where the compiler complains it isn't being used. And added a sqrtloop specific CFLAGS to disable optimizations to make this a bit more robust wrt dead code elimination. Doing that a -U_FORTIFY_SOURCE needs to be added, as -O0 is incompatible with it. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com> Cc: German Gomez <german.gomez@arm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Zhengjun Xing <zhengjun.xing@linux.intel.com> Link: https://lore.kernel.org/r/20221116233854.1596378-8-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests')
-rw-r--r--tools/perf/tests/builtin-test.c1
-rw-r--r--tools/perf/tests/tests.h1
-rw-r--r--tools/perf/tests/workloads/Build2
-rw-r--r--tools/perf/tests/workloads/sqrtloop.c45
4 files changed, 49 insertions, 0 deletions
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 0ed5ac452f6e..9acb7a93eeb9 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -122,6 +122,7 @@ static struct test_workload *workloads[] = {
&workload__noploop,
&workload__thloop,
&workload__leafloop,
+ &workload__sqrtloop,
};
static int num_subtests(const struct test_suite *t)
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 86804dd6452b..18c40319e67c 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -203,5 +203,6 @@ struct test_workload workload__##work = { \
DECLARE_WORKLOAD(noploop);
DECLARE_WORKLOAD(thloop);
DECLARE_WORKLOAD(leafloop);
+DECLARE_WORKLOAD(sqrtloop);
#endif /* TESTS_H */
diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
index 03dc675a4a7c..2312a338f01c 100644
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -3,5 +3,7 @@
perf-y += noploop.o
perf-y += thloop.o
perf-y += leafloop.o
+perf-y += sqrtloop.o
+CFLAGS_sqrtloop.o = -g -O0 -fno-inline -U_FORTIFY_SOURCE
CFLAGS_leafloop.o = -g -O0 -fno-inline -fno-omit-frame-pointer -U_FORTIFY_SOURCE
diff --git a/tools/perf/tests/workloads/sqrtloop.c b/tools/perf/tests/workloads/sqrtloop.c
new file mode 100644
index 000000000000..ccc94c6a6676
--- /dev/null
+++ b/tools/perf/tests/workloads/sqrtloop.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <math.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/compiler.h>
+#include <sys/wait.h>
+#include "../tests.h"
+
+static volatile sig_atomic_t done;
+
+static void sighandler(int sig __maybe_unused)
+{
+ done = 1;
+}
+
+static int __sqrtloop(int sec)
+{
+ signal(SIGALRM, sighandler);
+ alarm(sec);
+
+ while (!done)
+ (void)sqrt(rand());
+ return 0;
+}
+
+static int sqrtloop(int argc, const char **argv)
+{
+ int sec = 1;
+
+ if (argc > 0)
+ sec = atoi(argv[0]);
+
+ switch (fork()) {
+ case 0:
+ return __sqrtloop(sec);
+ case -1:
+ return -1;
+ default:
+ wait(NULL);
+ }
+ return 0;
+}
+
+DEFINE_WORKLOAD(sqrtloop);