From: Yonghong Song <yhs@fb•com>
To: <peterz@infradead•org>, <rostedt@goodmis•org>, <ast@fb•com>,
<daniel@iogearbox•net>, <netdev@vger•kernel.org>
Cc: <kernel-team@fb•com>
Subject: [PATCH net-next 4/4] bpf: add a test case for helper bpf_perf_prog_read_time
Date: Fri, 1 Sep 2017 09:53:57 -0700 [thread overview]
Message-ID: <20170901165357.465121-5-yhs@fb.com> (raw)
In-Reply-To: <20170901165357.465121-1-yhs@fb.com>
The bpf sample program trace_event is enhanced to use the new
helper to print out enabled/running time.
Signed-off-by: Yonghong Song <yhs@fb•com>
---
samples/bpf/trace_event_kern.c | 5 +++++
tools/testing/selftests/bpf/bpf_helpers.h | 3 +++
2 files changed, 8 insertions(+)
diff --git a/samples/bpf/trace_event_kern.c b/samples/bpf/trace_event_kern.c
index 41b6115..f372660 100644
--- a/samples/bpf/trace_event_kern.c
+++ b/samples/bpf/trace_event_kern.c
@@ -37,8 +37,10 @@ struct bpf_map_def SEC("maps") stackmap = {
SEC("perf_event")
int bpf_prog1(struct bpf_perf_event_data *ctx)
{
+ char time_fmt[] = "Time Enabled: %lld, Time Running: %lld";
char fmt[] = "CPU-%d period %lld ip %llx";
u32 cpu = bpf_get_smp_processor_id();
+ struct bpf_perf_time time_buf;
struct key_t key;
u64 *val, one = 1;
@@ -54,6 +56,9 @@ int bpf_prog1(struct bpf_perf_event_data *ctx)
return 0;
}
+ bpf_perf_prog_read_time(ctx, (void *)&time_buf, sizeof(struct bpf_perf_time));
+ bpf_trace_printk(time_fmt, sizeof(time_fmt), time_buf.enabled, time_buf.running);
+
val = bpf_map_lookup_elem(&counts, &key);
if (val)
(*val)++;
diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
index fe41852..ddad690 100644
--- a/tools/testing/selftests/bpf/bpf_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_helpers.h
@@ -74,6 +74,9 @@ static int (*bpf_perf_read_counter_time)(void *map, unsigned long long flags,
void *counter_time_buf,
unsigned int buf_size) =
(void *) BPF_FUNC_perf_read_counter_time;
+static int (*bpf_perf_prog_read_time)(void *ctx, void *time_buf,
+ unsigned int size) =
+ (void *) BPF_FUNC_perf_prog_read_time;
/* llvm builtin functions that eBPF C program may use to
--
2.9.5
prev parent reply other threads:[~2017-09-01 16:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 16:53 [PATCH net-next 0/4] bpf: add two helpers to read perf event enabled/running time Yonghong Song
2017-09-01 16:53 ` [PATCH net-next 1/4] bpf: add helper bpf_perf_read_counter_time for perf event array map Yonghong Song
2017-09-01 20:29 ` Alexei Starovoitov
2017-09-01 20:50 ` Peter Zijlstra
2017-09-01 21:01 ` Yonghong Song
2017-09-01 20:41 ` Peter Zijlstra
2017-09-01 16:53 ` [PATCH net-next 2/4] bpf: add a test case for helper bpf_perf_read_counter_time Yonghong Song
2017-09-01 16:53 ` [PATCH net-next 3/4] bpf: add helper bpf_perf_prog_read_time Yonghong Song
2017-09-01 16:53 ` Yonghong Song [this message]
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