[RFC PATCH v2 00/26] perf tools: Support uBPF script

From: He Kuang
Date: Sun Jun 26 2016 - 07:28:14 EST

This patchset is based on Wang Nan's v1:
http://thread.gmane.org/gmane.linux.kernel/2203717/focus=2203707

"""
This patch set allows to perf invoke some user space BPF scripts on
some point. uBPF scripts and kernel BPF scripts reside in one BPF
object. They communicate with each other with BPF maps. uBPF
scripts can invoke helper functions provided by perf.

At least following new features can be achieved based on uBPF
support:

1) Report statistical result:

Like DTrace, perf print statistical report before quit. No need
to extract data using 'perf report'. Statistical method is
controled by user.

2) Control perf's behavior:

Dynamically adjust period of different events. Policy is defined
by user.
"""

and modified by following the reviewers' suggestions.

v1-v2:

- Split bpf vm part out of kernel/bpf/core.c and link to it instead
of using ubpf library(Suggested by Alexei Starovoitov). And add
runtime bounds check just like ubpf library does.

- Introduce bpf_engine(engine-kbpf, engine-ubpf) operations and
getting rid of the complicate macros(Suggested by Arnaldo).

- Use void pointer to reference kbpf/ubpf entries.(Suggested by
Arnaldo)

The test case in the v1 cover letter still works but there's a slight
problem which should be pointed out to clarify the usage of ubpf
function arguments.

-int perf_record_end(int samples)
+struct perf_record_end_ctx {
+ int samples;
+ int dummy;
+};
+int perf_record_end(struct perf_record_end_ctx *ctx)

And the argument 'samples' should be referenced as 'ctx->samples'.

Thank you.

He Kuang (17):
bpf: extract jmp and default handler and introduce UBPF_BUILD flag
tools include: Add (atomic|atomic64)_add implementation from the
kernel sources
perf bpf: Implement empty instruction handler and build bpf-vm
perf bpf: Remove unused code in libbpf
perf bpf: Store arbitrary entries instread fd array in bpf_program
perf bpf: Add libbpf-internal.h header file
perf bpf: Add abstraction for bpf program methods
perf bpf: Add -Wextra to cflags for more warnings and fix them
perf bpf: Introduce the entity and engine for userspace bpf
perf bpf: Add method for fetching nth ubpf vm
perf bpf: Add methods to set/check ubpf engine for bpf programs
perf bpf: Add ubpf helper function slots and set/get methods
bpf: Support bpf load/store boundary check for ubpf
perf bpf: Implement boundary check code in ubpf
perf record: Add uBPF hooks at beginning and end of perf record
perf bpf: Fillup bpf jmp_call handler
perf bpf: Implement run_ubpf_program

Wang Nan (9):
tools include: Adopt byte ordering macros from byteorder/generic.h
tools include: Fix wrong macro definitions for cpu_to_le* for big
endian
bpf: split __bpf_prog_run code into new file
tools include: Sync math64.h and div64.h
perf bpf: Add map related BPF helper
perf bpf: Add UBPF flags and makefile options
perf tools: Register basic uBPF helpers
perf bpf: Accept uBPF programs
perf tests: Add uBPF test case

include/linux/filter.h | 1 +
kernel/bpf/Makefile | 2 +-
kernel/bpf/core.c | 487 -------------------
kernel/bpf/vm.c | 517 +++++++++++++++++++++
tools/arch/x86/include/asm/atomic.h | 28 ++
tools/include/asm-generic/atomic-gcc.h | 10 +
tools/include/asm-generic/div64.h | 234 ++++++++++
tools/include/linux/byteorder/generic.h | 48 ++
tools/include/linux/kernel.h | 7 +-
tools/include/linux/math64.h | 247 ++++++++++
tools/include/linux/types.h | 4 +
tools/lib/bpf/Build | 2 +
tools/lib/bpf/Makefile | 6 +-
tools/lib/bpf/bpf.c | 24 +
tools/lib/bpf/bpf.h | 2 +
tools/lib/bpf/engine-kbpf.c | 131 ++++++
tools/lib/bpf/engine-ubpf.c | 134 ++++++
tools/lib/bpf/libbpf-internal.h | 76 +++
tools/lib/bpf/libbpf.c | 216 ++-------
tools/lib/bpf/libbpf.h | 43 +-
tools/perf/MANIFEST | 3 +
tools/perf/Makefile.perf | 2 +
tools/perf/builtin-record.c | 4 +
tools/perf/config/Makefile | 4 +
tools/perf/perf.c | 3 +
tools/perf/tests/Build | 8 +
tools/perf/tests/bpf-script-test-ubpf.c | 88 ++++
tools/perf/tests/bpf.c | 78 +++-
tools/perf/tests/llvm.c | 4 +
tools/perf/tests/llvm.h | 2 +
tools/perf/util/Build | 3 +
tools/perf/util/bpf-loader.c | 23 +-
tools/perf/util/bpf-vm.c | 89 ++++
tools/perf/util/bpf-vm.h | 8 +
tools/perf/util/intel-bts.c | 5 -
.../util/intel-pt-decoder/intel-pt-pkt-decoder.c | 7 +-
tools/perf/util/ubpf-helpers-list.h | 11 +
tools/perf/util/ubpf-helpers.c | 73 +++
tools/perf/util/ubpf-helpers.h | 21 +
tools/perf/util/ubpf-hooks-list.h | 34 ++
tools/perf/util/ubpf-hooks.c | 81 ++++
tools/perf/util/ubpf-hooks.h | 41 ++
42 files changed, 2126 insertions(+), 685 deletions(-)
create mode 100644 kernel/bpf/vm.c
create mode 100644 tools/include/asm-generic/div64.h
create mode 100644 tools/include/linux/byteorder/generic.h
create mode 100644 tools/include/linux/math64.h
create mode 100644 tools/lib/bpf/engine-kbpf.c
create mode 100644 tools/lib/bpf/engine-ubpf.c
create mode 100644 tools/lib/bpf/libbpf-internal.h
create mode 100644 tools/perf/tests/bpf-script-test-ubpf.c
create mode 100644 tools/perf/util/bpf-vm.c
create mode 100644 tools/perf/util/bpf-vm.h
create mode 100644 tools/perf/util/ubpf-helpers-list.h
create mode 100644 tools/perf/util/ubpf-helpers.c
create mode 100644 tools/perf/util/ubpf-helpers.h
create mode 100644 tools/perf/util/ubpf-hooks-list.h
create mode 100644 tools/perf/util/ubpf-hooks.c
create mode 100644 tools/perf/util/ubpf-hooks.h

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1.8.5.2