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| author |   Teng Qin <qinteng@fb.com> | 2018-03-06 10:55:02 -0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-03-08 02:22:34 +0100 |
| commit | 12fe12253c56a26e591ceefbdf0998b391022003 (patch) | |
| tree | 822b9bb7680c97b84f98f8d471b297637048d473 /samples/bpf/trace_event_kern.c | |
| parent | bpf: add support to read sample address in bpf program (diff) | |
| download | wireguard-linux-12fe12253c56a26e591ceefbdf0998b391022003.tar.xz wireguard-linux-12fe12253c56a26e591ceefbdf0998b391022003.zip | |
samples/bpf: add example to test reading address
This commit adds additional test in the trace_event example, by
attaching the bpf program to MEM_UOPS_RETIRED.LOCK_LOADS event with
PERF_SAMPLE_ADDR requested, and print the lock address value read from
the bpf program to trace_pipe.
Signed-off-by: Teng Qin <qinteng@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples/bpf/trace_event_kern.c')
| -rw-r--r-- | samples/bpf/trace_event_kern.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/samples/bpf/trace_event_kern.c b/samples/bpf/trace_event_kern.c index a77a583d94d4..7068fbdde951 100644 --- a/samples/bpf/trace_event_kern.c +++ b/samples/bpf/trace_event_kern.c @@ -39,6 +39,7 @@ int bpf_prog1(struct bpf_perf_event_data *ctx) { char time_fmt1[] = "Time Enabled: %llu, Time Running: %llu"; char time_fmt2[] = "Get Time Failed, ErrCode: %d"; + char addr_fmt[] = "Address recorded on event: %llx"; char fmt[] = "CPU-%d period %lld ip %llx"; u32 cpu = bpf_get_smp_processor_id(); struct bpf_perf_event_value value_buf; @@ -64,6 +65,9 @@ int bpf_prog1(struct bpf_perf_event_data *ctx) else bpf_trace_printk(time_fmt2, sizeof(time_fmt2), ret); + if (ctx->addr != 0) + bpf_trace_printk(addr_fmt, sizeof(addr_fmt), ctx->addr); + val = bpf_map_lookup_elem(&counts, &key); if (val) (*val)++; |