linux-kernel - [RFC PATCH] find_vma BPF test: increase length CPU computation

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Date: Tue,  9 Jan 2024 09:56:37 +0000
From: "Alessandro Carminati (Red Hat)" <alessandro.carminati@...il.com>
To: Andrii Nakryiko <andrii@...nel.org>,
	Shuah Khan <shuah@...nel.org>
Cc: Mykola Lysenko <mykolal@...com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Alessandro Carminati <alessandro.carminati@...il.com>,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH] find_vma BPF test: increase length CPU computation

Some aarch64 systems running a PREEMPT_RT patched kernel, needs
more time to complete the test.
This change mirrors:
commit ba83af059153 ("Improve stability of find_vma BPF test")
addressing similar requirements and allowing the QTI SA8775P based
systems, and others, to complete the test when running RT kernel.

Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@...il.com>
---
 tools/testing/selftests/bpf/prog_tests/find_vma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/find_vma.c b/tools/testing/selftests/bpf/prog_tests/find_vma.c
index 5165b38f0e59..43d62db8d57b 100644
--- a/tools/testing/selftests/bpf/prog_tests/find_vma.c
+++ b/tools/testing/selftests/bpf/prog_tests/find_vma.c
@@ -51,7 +51,7 @@ static void test_find_vma_pe(struct find_vma *skel)
 	struct bpf_link *link = NULL;
 	volatile int j = 0;
 	int pfd, i;
-	const int one_bn = 1000000000;
+	const int dummy_wait = 2500000000;
 
 	pfd = open_pe();
 	if (pfd < 0) {
@@ -68,10 +68,10 @@ static void test_find_vma_pe(struct find_vma *skel)
 	if (!ASSERT_OK_PTR(link, "attach_perf_event"))
 		goto cleanup;
 
-	for (i = 0; i < one_bn && find_vma_pe_condition(skel); ++i)
+	for (i = 0; i < dummy_wait && find_vma_pe_condition(skel); ++i)
 		++j;
 
-	test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */, i == one_bn);
+	test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */, i == dummy_wait);
 cleanup:
 	bpf_link__destroy(link);
 	close(pfd);
-- 
2.34.1