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From: Yucong Sun <fallentree@fb.com>
To: <bpf@vger.kernel.org>
Cc: <andrii@kernel.org>, <sunyucong@gmail.com>
Subject: [PATCH bpf-next v6 05/14] selftests/bpf: adding read_perf_max_sample_freq() helper
Date: Wed, 6 Oct 2021 11:56:10 -0700	[thread overview]
Message-ID: <20211006185619.364369-6-fallentree@fb.com> (raw)
In-Reply-To: <20211006185619.364369-1-fallentree@fb.com>

From: Yucong Sun <sunyucong@gmail.com>

This patch moved a helper function to test_progs and make all tests
setting sampling frequency use it to read current perf_max_sample_freq,
this will avoid triggering EINVAL error.

Signed-off-by: Yucong Sun <sunyucong@gmail.com>
---
 .../selftests/bpf/prog_tests/bpf_cookie.c     |  2 +-
 .../selftests/bpf/prog_tests/perf_branches.c  |  4 ++--
 .../selftests/bpf/prog_tests/perf_link.c      |  2 +-
 .../bpf/prog_tests/stacktrace_build_id_nmi.c  | 19 ++-----------------
 tools/testing/selftests/bpf/test_progs.c      | 15 +++++++++++++++
 tools/testing/selftests/bpf/test_progs.h      |  1 +
 6 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
index 5eea3c3a40fe..19c9f7b53cfa 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
@@ -193,7 +193,7 @@ static void pe_subtest(struct test_bpf_cookie *skel)
 	attr.type = PERF_TYPE_SOFTWARE;
 	attr.config = PERF_COUNT_SW_CPU_CLOCK;
 	attr.freq = 1;
-	attr.sample_freq = 4000;
+	attr.sample_freq = read_perf_max_sample_freq();
 	pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
 	if (!ASSERT_GE(pfd, 0, "perf_fd"))
 		goto cleanup;
diff --git a/tools/testing/selftests/bpf/prog_tests/perf_branches.c b/tools/testing/selftests/bpf/prog_tests/perf_branches.c
index 12c4f45cee1a..6b2e3dced619 100644
--- a/tools/testing/selftests/bpf/prog_tests/perf_branches.c
+++ b/tools/testing/selftests/bpf/prog_tests/perf_branches.c
@@ -110,7 +110,7 @@ static void test_perf_branches_hw(void)
 	attr.type = PERF_TYPE_HARDWARE;
 	attr.config = PERF_COUNT_HW_CPU_CYCLES;
 	attr.freq = 1;
-	attr.sample_freq = 4000;
+	attr.sample_freq = read_perf_max_sample_freq();
 	attr.sample_type = PERF_SAMPLE_BRANCH_STACK;
 	attr.branch_sample_type = PERF_SAMPLE_BRANCH_USER | PERF_SAMPLE_BRANCH_ANY;
 	pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
@@ -151,7 +151,7 @@ static void test_perf_branches_no_hw(void)
 	attr.type = PERF_TYPE_SOFTWARE;
 	attr.config = PERF_COUNT_SW_CPU_CLOCK;
 	attr.freq = 1;
-	attr.sample_freq = 4000;
+	attr.sample_freq = read_perf_max_sample_freq();
 	pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
 	if (CHECK(pfd < 0, "perf_event_open", "err %d\n", pfd))
 		return;
diff --git a/tools/testing/selftests/bpf/prog_tests/perf_link.c b/tools/testing/selftests/bpf/prog_tests/perf_link.c
index b1abd0c46607..74e5bd5f1c19 100644
--- a/tools/testing/selftests/bpf/prog_tests/perf_link.c
+++ b/tools/testing/selftests/bpf/prog_tests/perf_link.c
@@ -38,7 +38,7 @@ void test_perf_link(void)
 	attr.type = PERF_TYPE_SOFTWARE;
 	attr.config = PERF_COUNT_SW_CPU_CLOCK;
 	attr.freq = 1;
-	attr.sample_freq = 4000;
+	attr.sample_freq = read_perf_max_sample_freq();
 	pfd = syscall(__NR_perf_event_open, &attr, -1, 0, -1, PERF_FLAG_FD_CLOEXEC);
 	if (!ASSERT_GE(pfd, 0, "perf_fd"))
 		goto cleanup;
diff --git a/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c b/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
index 0a91d8d9954b..150536f01442 100644
--- a/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
+++ b/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
@@ -2,21 +2,6 @@
 #include <test_progs.h>
 #include "test_stacktrace_build_id.skel.h"
 
-static __u64 read_perf_max_sample_freq(void)
-{
-	__u64 sample_freq = 5000; /* fallback to 5000 on error */
-	FILE *f;
-	__u32 duration = 0;
-
-	f = fopen("/proc/sys/kernel/perf_event_max_sample_rate", "r");
-	if (f == NULL)
-		return sample_freq;
-	CHECK(fscanf(f, "%llu", &sample_freq) != 1, "Get max sample rate",
-		  "return default value: 5000,err %d\n", -errno);
-	fclose(f);
-	return sample_freq;
-}
-
 void test_stacktrace_build_id_nmi(void)
 {
 	int control_map_fd, stackid_hmap_fd, stackmap_fd;
@@ -34,8 +19,6 @@ void test_stacktrace_build_id_nmi(void)
 	int build_id_matches = 0;
 	int retry = 1;
 
-	attr.sample_freq = read_perf_max_sample_freq();
-
 retry:
 	skel = test_stacktrace_build_id__open();
 	if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
@@ -48,6 +31,8 @@ void test_stacktrace_build_id_nmi(void)
 	if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
 		goto cleanup;
 
+	attr.sample_freq = read_perf_max_sample_freq();
+
 	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
 			 0 /* cpu 0 */, -1 /* group id */,
 			 0 /* flags */);
diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 2ac922f8aa2c..66825313414b 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -1500,3 +1500,18 @@ int main(int argc, char **argv)
 
 	return env.fail_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
 }
+
+__u64 read_perf_max_sample_freq(void)
+{
+	__u64 sample_freq = 1000; /* fallback to 1000 on error */
+	FILE *f;
+	__u32 duration = 0;
+
+	f = fopen("/proc/sys/kernel/perf_event_max_sample_rate", "r");
+	if (f == NULL)
+		return sample_freq;
+	CHECK(fscanf(f, "%llu", &sample_freq) != 1, "Get max sample rate",
+	      "return default value: 5000,err %d\n", -errno);
+	fclose(f);
+	return sample_freq;
+}
diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
index b239dc9fcef0..d5ca0d36cc96 100644
--- a/tools/testing/selftests/bpf/test_progs.h
+++ b/tools/testing/selftests/bpf/test_progs.h
@@ -327,6 +327,7 @@ int extract_build_id(char *build_id, size_t size);
 int kern_sync_rcu(void);
 int trigger_module_test_read(int read_sz);
 int trigger_module_test_write(int write_sz);
+__u64 read_perf_max_sample_freq(void);
 
 #ifdef __x86_64__
 #define SYS_NANOSLEEP_KPROBE_NAME "__x64_sys_nanosleep"
-- 
2.30.2


  parent reply	other threads:[~2021-10-06 18:56 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-06 18:56 [PATCH bpf-next v6 00/14] selftests/bpf: Add parallelism to test_progs Yucong Sun
2021-10-06 18:56 ` [PATCH bpf-next v6 01/14] " Yucong Sun
2021-10-08 22:26   ` Andrii Nakryiko
2021-10-06 18:56 ` [PATCH bpf-next v6 02/14] selftests/bpf: Allow some tests to be executed in sequence Yucong Sun
2021-10-08 22:26   ` Andrii Nakryiko
2021-10-08 23:06     ` sunyucong
2021-10-09  3:17       ` Andrii Nakryiko
2021-10-06 18:56 ` [PATCH bpf-next v6 03/14] selftests/bpf: disable perf rate limiting when running tests Yucong Sun
2021-10-08 22:26   ` Andrii Nakryiko
2021-10-06 18:56 ` [PATCH bpf-next v6 04/14] selftests/bpf: add per worker cgroup suffix Yucong Sun
2021-10-06 18:56 ` Yucong Sun [this message]
2021-10-08 22:27   ` [PATCH bpf-next v6 05/14] selftests/bpf: adding read_perf_max_sample_freq() helper Andrii Nakryiko
2021-10-08 22:49     ` sunyucong
2022-03-08 20:22       ` sunyucong
2021-10-06 18:56 ` [PATCH bpf-next v6 06/14] selftests/bpf: fix race condition in enable_stats Yucong Sun
2021-10-06 18:56 ` [PATCH bpf-next v6 07/14] selftests/bpf: make cgroup_v1v2 use its own port Yucong Sun
2021-10-06 18:56 ` [PATCH bpf-next v6 08/14] selftests/bpf: adding a namespace reset for tc_redirect Yucong Sun
2021-10-08 22:27   ` Andrii Nakryiko
2021-10-08 23:07     ` sunyucong
2021-10-06 18:56 ` [PATCH bpf-next v6 09/14] selftests/bpf: Make uprobe tests use different attach functions Yucong Sun
2021-10-08 22:27   ` Andrii Nakryiko
2021-10-08 22:46     ` sunyucong
2021-10-09  3:13       ` Andrii Nakryiko
2021-10-06 18:56 ` [PATCH bpf-next v6 10/14] selftests/bpf: adding pid filtering for atomics test Yucong Sun
2021-10-06 18:56 ` [PATCH bpf-next v6 11/14] selftests/bpf: adding random delay for send_signal test Yucong Sun
2021-10-08 22:27   ` Andrii Nakryiko
2021-10-06 18:56 ` [PATCH bpf-next v6 12/14] selftests/bpf: Fix pid check in fexit_sleep test Yucong Sun
2021-10-06 18:56 ` [PATCH bpf-next v6 13/14] selftests/bpf: increase loop count for perf_branches Yucong Sun
2021-10-08 22:27   ` Andrii Nakryiko
2021-10-08 22:57     ` sunyucong
2021-10-06 18:56 ` [PATCH bpf-next v6 14/14] selfetest/bpf: make some tests serial Yucong Sun
2021-10-08 22:27   ` Andrii Nakryiko
2021-10-08 22:55     ` sunyucong
2021-10-09  3:14       ` Andrii Nakryiko
2021-10-08 22:26 ` [PATCH bpf-next v6 00/14] selftests/bpf: Add parallelism to test_progs Andrii Nakryiko
2021-10-08 22:42   ` Andrii Nakryiko
2021-10-08 23:37     ` Steven Rostedt
2021-10-09  3:20       ` Andrii Nakryiko
2021-10-09  3:28         ` Steven Rostedt

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