Hi Arnaldo, We didn't make too much progress on this patchset for several weeks. Kernel support of bpf-output has already been merged by v4.4, but perf side code is still missing in v4.5. Do you have any plan on it?
Brendan asked this feature this month. I think he would be disappointed because he still unable to use them on v4.5 kernel... Thank you. On 2016/1/25 17:55, Wang Nan wrote:
Hi Arnaldo, The following changes since commit 512e583b2d4a35b644c8ff36e033b90be7e91c2e: perf hists browser: Offer non-symbol specific menu options for --sort without 'sym' (2016-01-22 14:28:48 -0300) are available in the git repository at: https://git.kernel.org/pub/scm/linux/kernel/git/pi3orama/linux.git tags/perf-core-for-acme for you to fetch changes up to 7c8463658d92b82c2a8db9f405b50ae814b91f71: perf tools: Don't warn about out of order event if write_backward is used (2016-01-25 09:49:15 +0000) ---------------------------------------------------------------- perf improvements: - Bug fixes: libbpf relocation checker for a llvm bug fix symbol searching for offline modules - Building scripts: Use feature-dump results for build-test - BPF related improvements: Enable indices syntax to support init BPF maps Support BPF output events support - perf/core: Add write_backward attribute bit to support reading from overwrite ring buffer - perf record improvements: Enable perf record dump different output Support reading from overwrite ring buffer based on write_backward attribute Signed-off-by: Wang Nan <wangn...@huawei.com> ---------------------------------------------------------------- He Kuang (1): perf tools: Support perf event alias name Wang Nan (53): perf test: Add libbpf relocation checker perf bpf: Check relocation target section tools build: Allow subprojects select all feature checkers perf build: Select all feature checkers for feature-dump perf build: Use feature dump file for build-test perf test: Check environment before start real BPF test perf tools: Fix symbols searching for offline module in buildid-cache perf test: Improve bp_signal perf tools: Add API to config maps in bpf object perf tools: Enable BPF object configure syntax perf record: Apply config to BPF objects before recording perf tools: Enable passing event to BPF object perf tools: Support setting different slots in a BPF map separately perf tools: Enable indices setting syntax for BPF maps perf tools: Introduce bpf-output event perf data: Support converting data from bpf_perf_event_output() perf core: Introduce new ioctl options to pause and resume ring buffer perf core: Set event's default overflow_handler perf core: Prepare writing into ring buffer from end perf core: Add backward attribute to perf event perf core: Reduce perf event output overhead by new overflow handler perf tools: Introduce API to pause ring buffer perf tools: Only validate is_pos for tracking evsels perf tools: Print write_backward value in perf_event_attr__fprintf perf tools: Move timestamp creation to util perf tools: Make ordered_events reusable perf record: Extract synthesize code to record__synthesize() perf tools: Add perf_data_file__switch() helper perf record: Turns auxtrace_snapshot_enable into 3 states perf record: Introduce record__finish_output() to finish a perf.data perf record: Use OPT_BOOLEAN_SET for buildid cache related options perf record: Add '--timestamp-filename' option to append timestamp to output filename perf record: Split output into multiple files via '--switch-output' perf record: Force enable --timestamp-filename when --switch-output is provided perf record: Disable buildid cache options by default in switch output mode perf record: Re-synthesize tracking events after output switching perf record: Generate tracking events for process forked by perf perf record: Ensure return non-zero rc when mmap fail perf record: Prevent reading invalid data in record__mmap_read perf tools: Add evlist channel helpers perf tools: Automatically add new channel according to evlist perf tools: Operate multiple channels perf tools: Squash overwrite setting into channel perf record: Don't read from and poll overwrite channel perf record: Don't poll on overwrite channel perf tools: Detect avalibility of write_backward perf tools: Enable overwrite settings perf tools: Set write_backward attribut bit for overwrite events perf record: Toggle overwrite ring buffer for reading perf record: Rename variable to make code clear perf record: Read from backward ring buffer perf record: Allow generate tracking events at the end of output perf tools: Don't warn about out of order event if write_backward is used include/linux/perf_event.h | 22 +- include/uapi/linux/perf_event.h | 4 +- kernel/events/core.c | 73 ++- kernel/events/internal.h | 11 + kernel/events/ring_buffer.c | 63 ++- tools/build/Makefile.feature | 21 +- tools/lib/bpf/libbpf.c | 34 +- tools/perf/Makefile.perf | 11 +- tools/perf/builtin-buildid-cache.c | 14 +- tools/perf/builtin-record.c | 608 ++++++++++++++++++---- tools/perf/perf.h | 2 + tools/perf/tests/.gitignore | 1 + tools/perf/tests/Build | 9 +- tools/perf/tests/bp_signal.c | 140 +++++- tools/perf/tests/bpf-script-test-relocation.c | 50 ++ tools/perf/tests/bpf.c | 63 ++- tools/perf/tests/llvm.c | 17 +- tools/perf/tests/llvm.h | 5 +- tools/perf/tests/make | 31 ++ tools/perf/util/bpf-loader.c | 699 ++++++++++++++++++++++++++ tools/perf/util/bpf-loader.h | 59 +++ tools/perf/util/build-id.c | 44 ++ tools/perf/util/build-id.h | 1 + tools/perf/util/data-convert-bt.c | 112 ++++- tools/perf/util/data.c | 36 ++ tools/perf/util/data.h | 11 +- tools/perf/util/evlist.c | 314 ++++++++++-- tools/perf/util/evlist.h | 67 ++- tools/perf/util/evsel.c | 30 ++ tools/perf/util/evsel.h | 13 + tools/perf/util/ordered-events.c | 5 + tools/perf/util/parse-events.c | 139 ++++- tools/perf/util/parse-events.h | 24 +- tools/perf/util/parse-events.l | 18 +- tools/perf/util/parse-events.y | 123 ++++- tools/perf/util/record.c | 11 + tools/perf/util/session.c | 22 +- tools/perf/util/symbol.c | 4 + tools/perf/util/util.c | 17 + tools/perf/util/util.h | 1 + 40 files changed, 2689 insertions(+), 240 deletions(-) create mode 100644 tools/perf/tests/bpf-script-test-relocation.c
