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Sun, 21 Sep 2025 19:42:49 -0700 (PDT) Message-ID: Date: Mon, 22 Sep 2025 10:42:44 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v3 2/2] selftests/bpf: Add stacktrace map lookup_and_delete_elem test case Content-Language: en-US To: Tao Chen , ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250920155211.1354348-1-chen.dylane@linux.dev> <20250920155211.1354348-2-chen.dylane@linux.dev> From: Leon Hwang In-Reply-To: <20250920155211.1354348-2-chen.dylane@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 20/9/25 23:52, Tao Chen wrote: > ... > test_stacktrace_map:PASS:compare_stack_ips stackmap vs. stack_amap 0 nsec > test_stacktrace_map:PASS:stack_key_map lookup 0 nsec > test_stacktrace_map:PASS:stackmap lookup and detele 0 nsec > test_stacktrace_map:PASS:stackmap lookup deleted stack_id 0 nsec > #397 stacktrace_map:OK > ... As they suppose to pass, they are meaningless in the commit log. Please describe what the test is for and what it is doing instead. > > Signed-off-by: Tao Chen > --- > .../selftests/bpf/prog_tests/stacktrace_map.c | 22 ++++++++++++++++++- > .../selftests/bpf/progs/test_stacktrace_map.c | 8 +++++++ > 2 files changed, 29 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/bpf/prog_tests/stacktrace_map.c b/tools/testing/selftests/bpf/prog_tests/stacktrace_map.c > index 84a7e405e91..7d38afe5cfc 100644 > --- a/tools/testing/selftests/bpf/prog_tests/stacktrace_map.c > +++ b/tools/testing/selftests/bpf/prog_tests/stacktrace_map.c > @@ -3,7 +3,7 @@ > > void test_stacktrace_map(void) > { > - int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; > + int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd, stack_key_map_fd; > const char *prog_name = "oncpu"; > int err, prog_fd, stack_trace_len; > const char *file = "./test_stacktrace_map.bpf.o"; > @@ -11,6 +11,9 @@ void test_stacktrace_map(void) > struct bpf_program *prog; > struct bpf_object *obj; > struct bpf_link *link; > + __u32 stack_id; > + char val_buf[PERF_MAX_STACK_DEPTH * > + sizeof(struct bpf_stack_build_id)]; Nit: minor indentation issue here. 'val_buf' should stay on a single line, since up to 100 characters per line are allowed. NOTE: keep inverted Christmas tree style. Thanks, Leon > > err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); > if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) > @@ -41,6 +44,10 @@ void test_stacktrace_map(void) > if (CHECK_FAIL(stack_amap_fd < 0)) > goto disable_pmu; > > + stack_key_map_fd = bpf_find_map(__func__, obj, "stack_key_map"); > + if (CHECK_FAIL(stack_key_map_fd < 0)) > + goto disable_pmu; > + > /* give some time for bpf program run */ > sleep(1); > [...]