Hello.
On 10/28/2015 1:55 PM, Wang Nan wrote:
Commit a43eec304259a6c637f4014a6d4767159b6a3aa3 (bpf: introduce
bpf_perf_event_output() helper) add a helper to enable BPF program
You haven't run the patch thru scripts/checkpath.pl, I guess? It now
enforces the certain style of citing a commit.
output data to perf ring buffer through a new type of perf event
PERF_COUNT_SW_BPF_OUTPUT. This patch enable perf to create perf
event of that type. Now perf user can use following cmdline to
receive output data from BPF programs:
# perf record -a -e evt=bpf-output/no-inherit/ \
-e ./test_bpf_output.c/maps.bpf-output.event=evt/ ls
# perf script
perf 12927 [004] 355971.129276: 0 evt=bpf-output/no-inherit/:
ffffffff811ed5f1 sys_write
perf 12927 [004] 355971.129279: 0 evt=bpf-output/no-inherit/:
ffffffff811ed5f1 sys_write
...
Signed-off-by: Wang Nan <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Brendan Gregg <[email protected]>
Cc: David S. Miller <[email protected]>
---
tools/perf/util/evsel.c | 6 ++++++
tools/perf/util/parse-events.c | 4 ++++
tools/perf/util/parse-events.l | 1 +
3 files changed, 11 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 397fb4e..f01defb 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -224,6 +224,12 @@ struct perf_evsel *perf_evsel__new_idx(struct
perf_event_attr *attr, int idx)
if (evsel != NULL)
perf_evsel__init(evsel, attr, idx);
+ if ((evsel->attr.type == PERF_TYPE_SOFTWARE) &&
+ (evsel->attr.config == PERF_COUNT_SW_BPF_OUTPUT)) {
Inner parens not necessary here.
[...]
MBR, Sergei
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