From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wang Nan Subject: [RFC PATCH net-next 2/4] perf tools: Introduce bpf-output event Date: Wed, 28 Oct 2015 10:55:03 +0000 Message-ID: <1446029705-199659-3-git-send-email-wangnan0@huawei.com> References: <1446029705-199659-1-git-send-email-wangnan0@huawei.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , Wang Nan , Alexei Starovoitov , "Arnaldo Carvalho de Melo" To: , , , Return-path: In-Reply-To: <1446029705-199659-1-git-send-email-wangnan0@huawei.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Commit a43eec304259a6c637f4014a6d4767159b6a3aa3 (bpf: introduce bpf_perf_event_output() helper) add a helper to enable BPF program 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 Cc: Alexei Starovoitov Cc: Arnaldo Carvalho de Melo Cc: Brendan Gregg Cc: David S. Miller --- 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)) { + evsel->attr.sample_type |= PERF_SAMPLE_RAW; + evsel->attr.sample_period = 1; + } + return evsel; } diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index b98a82c..6ac39d6 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -124,6 +124,10 @@ struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = { .symbol = "dummy", .alias = "", }, + [PERF_COUNT_SW_BPF_OUTPUT] = { + .symbol = "bpf-output", + .alias = "", + }, }; #define __PERF_EVENT_FIELD(config, name) \ diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 1fa8e0b..f4ed79b 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -249,6 +249,7 @@ cpu-migrations|migrations { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COU alignment-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_ALIGNMENT_FAULTS); } emulation-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_EMULATION_FAULTS); } dummy { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_DUMMY); } +bpf-output { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_BPF_OUTPUT); } /* * We have to handle the kernel PMU event cycles-ct/cycles-t/mem-loads/mem-stores separately. -- 1.8.3.4