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Groups > linux.kernel > #1246650
| From | Wang Nan <wangnan0@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [GIT PULL 00/31] perf tools: filtering events using eBPF programs |
| Date | 2015-10-14 14:50 +0200 |
| Message-ID | <qjtFf-7cv-3@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
Hi Arnaldo,
I know you don't have enough time to review my code. I send
this patchset to let you and other know what we are working on.
In this new patchset, we create a new perf cmdline syntax so
perf users are able to pass perf events created by perf to BPF
maps, which makes bpf_perf_event_read() usable. Compare with out
previous solution[1] which embedded 'struct perf_event_attr' to
"maps" section, this solution is easier to use.
If you or anyone have any different views on this solution,
please let us know so we can stop our further development base
on it as soon as possible.
Thank you.
[1] http://lkml.kernel.org/r/1440672142-89311-1-git-send-email-xiakaixu@huawei.com
The following changes since commit 31eb4360546b4bd890f349db01295a173c09b0fb:
perf hists browser: Add 'm' key for context menu display (2015-10-12 23:29:14 -0300)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/pi3orama/linux.git tags/perf-ebpf-for-acme-20151014
for you to fetch changes up to 6df036cb7d42a2e0ebf312e127b02425bd57bc55:
perf tools: Enable BPF object configure syntax (2015-10-14 10:09:17 +0000)
----------------------------------------------------------------
EBPF support for perf
- Rebase to newest perf/core
- Bugfix: kprobe events not remove if bpf__probe() failure occur
after it creates some kprobe points successfully.
- Bugfix: when multiple BPF functions reside in one BPF object,
the last BPF program would be attached to all kprobe events.
This bug is introduced by removal of dummy event placeholder.
- New function: support BPF program reading counter through
bpf_perf_event_read() by adding new syntax and support code
in event selector. The new BPF object configuration mechanism
can be extended to support BPF data output.
In this patchset, following BPF function can be used to measure
cycles a kernel function cost:
===== BPF program bpf_program.c =====
struct bpf_map_def SEC("maps") pmu_map = {
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(u32),
.max_entries = __NR_CPUS__,
};
SEC("func_write=sys_write")
int func_write(void *ctx)
{
unsigned long long val;
char fmt[] = "sys_write: pmu=%llu\n";
val = bpf_perf_event_read(&pmu_map, bpf_get_smp_processor_id());
bpf_trace_printk(fmt, sizeof(fmt), val);
return 0;
}
SEC("func_write_return=sys_write%return")
int func_write_return(void *ctx)
{
unsigned long long val = 0;
char fmt[] = "sys_write_return: pmu=%llu\n";
val = bpf_perf_event_read(&pmu_map, bpf_get_smp_processor_id());
bpf_trace_printk(fmt, sizeof(fmt), val);
return 0;
}
With cmdline like this:
===== cmdline =====
# echo "" > /sys/kernel/debug/tracing/trace
# perf record -e evt=cycles/period=0x7fffffffffffffff/ \
-e bpf_program.c/maps.pmu_map.event=evt/
-a ls
# cat /sys/kernel/debug/tracing/trace | grep ls
ls-3363 [003] d... 75475.056190: : sys_write: pmu=3961415
ls-3363 [003] dN.. 75475.056212: : sys_write_return: pmu=4051390
ls-3363 [003] d... 75475.056216: : sys_write: pmu=4065447
ls-3363 [003] dN.. 75475.056227: : sys_write_return: pmu=4109760
ls-3363 [003] d... 75475.056230: : sys_write: pmu=4120776
ls-3363 [003] dN.. 75475.056245: : sys_write_return: pmu=4178441
...
# perf report --stdio
Error:
The perf.data file has no samples!
Signed-off-by: Wang Nan <wangnan0@huawei.com>
----------------------------------------------------------------
He Kuang (5):
perf tools: Add prologue for BPF programs for fetching arguments
perf record: Support custom vmlinux path
bpf tools: Add helper function for updating bpf maps elements
perf tools: Support perf event alias name
perf record: Apply config to BPF objects before recording
Wang Nan (26):
perf tools: Make perf depend on libbpf
perf ebpf: Add the libbpf glue
perf tools: Enable passing bpf object file to --event
perf record, bpf: Create probe points for BPF programs
perf record: Load eBPF object into kernel
perf tools: Collect perf_evsel in BPF object files
perf tools: Attach eBPF program to perf event
perf record: Add clang options for compiling BPF scripts
perf tools: Compile scriptlets to BPF objects when passing '.c' to --event
perf test: Enforce LLVM test for BPF test
perf test: Add 'perf test BPF'
perf probe: Reset args and nargs for probe_trace_event when failure
bpf tools: Load a program with different instances using preprocessor
perf tools: Add BPF_PROLOGUE config options for further patches
perf tools: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on
perf tools: Generate prologue for BPF programs
perf tools: Use same BPF program if arguments are identical
perf tools: Allow BPF program attach to uprobe events
perf test: Enforce LLVM test, add kbuild test
perf test: Test BPF prologue
bpf tools: Collect map definition in bpf_object
bpf tools: Extract and collect map names from BPF object file
perf tools: Pass available CPU number to clang compiler
perf tools: Add API to config maps in bpf object
perf tools: Add API to apply config to BPF map
perf tools: Enable BPF object configure syntax
tools/build/Makefile.feature | 6 +-
tools/lib/bpf/bpf.c | 14 +
tools/lib/bpf/bpf.h | 2 +
tools/lib/bpf/libbpf.c | 392 +++++++++---
tools/lib/bpf/libbpf.h | 46 ++
tools/perf/MANIFEST | 3 +
tools/perf/Makefile.perf | 21 +-
tools/perf/arch/x86/util/Build | 1 +
tools/perf/builtin-record.c | 21 +
tools/perf/config/Makefile | 31 +-
tools/perf/perf.c | 2 +
tools/perf/tests/Build | 24 +-
tools/perf/tests/bpf-script-example.c | 48 ++
tools/perf/tests/bpf-script-test-kbuild.c | 21 +
tools/perf/tests/bpf-script-test-prologue.c | 35 ++
tools/perf/tests/bpf.c | 227 +++++++
tools/perf/tests/builtin-test.c | 10 +
tools/perf/tests/llvm.c | 210 ++++++-
tools/perf/tests/llvm.h | 29 +
tools/perf/tests/make | 4 +-
tools/perf/tests/tests.h | 5 +
tools/perf/util/Build | 2 +
tools/perf/util/bpf-loader.c | 933 ++++++++++++++++++++++++++++
tools/perf/util/bpf-loader.h | 148 +++++
tools/perf/util/bpf-prologue.c | 443 +++++++++++++
tools/perf/util/bpf-prologue.h | 34 +
tools/perf/util/evlist.c | 16 +
tools/perf/util/evlist.h | 4 +
tools/perf/util/evsel.c | 17 +
tools/perf/util/evsel.h | 2 +
tools/perf/util/llvm-utils.c | 24 +-
tools/perf/util/parse-events.c | 221 ++++++-
tools/perf/util/parse-events.h | 15 +
tools/perf/util/parse-events.l | 6 +
tools/perf/util/parse-events.y | 55 +-
tools/perf/util/probe-finder.c | 4 +
36 files changed, 2968 insertions(+), 108 deletions(-)
create mode 100644 tools/perf/tests/bpf-script-example.c
create mode 100644 tools/perf/tests/bpf-script-test-kbuild.c
create mode 100644 tools/perf/tests/bpf-script-test-prologue.c
create mode 100644 tools/perf/tests/bpf.c
create mode 100644 tools/perf/tests/llvm.h
create mode 100644 tools/perf/util/bpf-loader.c
create mode 100644 tools/perf/util/bpf-loader.h
create mode 100644 tools/perf/util/bpf-prologue.c
create mode 100644 tools/perf/util/bpf-prologue.h
--
1.8.3.4
--
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[GIT PULL 00/31] perf tools: filtering events using eBPF programs Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 28/31] perf tools: Add API to config maps in bpf object Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 12/31] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 31/31] perf tools: Enable BPF object configure syntax Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 06/31] perf tools: Collect perf_evsel in BPF object files Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 10/31] perf test: Enforce LLVM test for BPF test Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
Re: [PATCH 10/31] perf test: Enforce LLVM test for BPF test Namhyung Kim <namhyung@kernel.org> - 2015-10-14 18:00 +0200
Re: [PATCH 10/31] perf test: Enforce LLVM test for BPF test "Wangnan (F)" <wangnan0@huawei.com> - 2015-10-15 14:10 +0200
[PATCH 01/31] perf tools: Make perf depend on libbpf Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 29/31] perf tools: Add API to apply config to BPF map Wang Nan <wangnan0@huawei.com> - 2015-10-14 14:50 +0200
[PATCH 22/31] perf test: Test BPF prologue Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 07/31] perf tools: Attach eBPF program to perf event Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 26/31] perf tools: Support perf event alias name Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 05/31] perf record: Load eBPF object into kernel Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 25/31] bpf tools: Extract and collect map names from BPF object file Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 18/31] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 04/31] perf record, bpf: Create probe points for BPF programs Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 21/31] perf test: Enforce LLVM test, add kbuild test Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
[PATCH 03/31] perf tools: Enable passing bpf object file to --event Wang Nan <wangnan0@huawei.com> - 2015-10-14 15:00 +0200
Re: [GIT PULL 00/31] perf tools: filtering events using eBPF programs Namhyung Kim <namhyung@kernel.org> - 2015-10-14 17:50 +0200
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