[GIT PULL 00/24] perf/ebpf lib + llvm/clang building infrastructure

[Arnaldo Carvalho de Melo]

Hi Ingo,

	This is up to a test that checks that the infrastructure for getting
a C source file and build it to a form that can then be used to upload it to
the kernel is working.

	Wang has a tree where we go all the way to passing a .c file as an
--event, but I thought about breaking the patchkit up to what is settled and
the "perf test -v LLVM" point looks like a good cutoff point for demoing/testing
what is in this patchkit.

	It shouldn't affect people without the environment needed, as well it
should check the environment for sanity and provide info about how to get it
working, be it in the changeset logs, the docs and on tool output messages.o

	If you find anything in it that needs fixing, please let us know if you
think we should fix it before merging it to this point or if something can be
fixed in follow up patches.

	Wang's repo, rebased, almost builds, he should be refreshing this soon,
fixing those trailing whitespace issues, that is stopping the rebase here:

  [acme@zoo linux]$ git remote -v | grep wang | head -1
  wangnan.github	https://github.com/WangNan0/linux.git (fetch)
  [acme@zoo linux]$ git checkout -b ebpf-test wangnan.github/ebpf
  Branch ebpf-test set up to track remote branch ebpf from wangnan.github.
  Switched to a new branch 'ebpf-test'
  [acme@zoo linux]$ git rebase perf/ebpf
  First, rewinding head to replay your work on top of it...
  Applying: perf tests: Add LLVM test for eBPF on-the-fly compiling
  Using index info to reconstruct a base tree...
  M	tools/perf/tests/Build
  M 	tools/perf/tests/builtin-test.c
  M	tools/perf/tests/tests.h
  M	tools/perf/util/llvm-utils.c
  M	tools/perf/util/llvm-utils.h
  Falling back to patching base and 3-way merge...
  No changes -- Patch already applied.
  Applying: perf tools: Make perf depend on libbpf
  Using index info to reconstruct a base tree...
  M	tools/perf/MANIFEST
  Falling back to patching base and 3-way merge...
  Auto-merging tools/perf/MANIFEST
  Applying: perf ebpf: Add the libbpf glue
  Applying: perf tools: Enable passing bpf object file to --event
  Applying: perf tools: Parse probe points of eBPF programs during preparation
  Applying: perf probe: Attach trace_probe_event with perf_probe_event
  Applying: perf record: Probe at kprobe points
  Applying: perf record: Load all eBPF object into kernel
  Applying: perf tools: Add bpf_fd field to evsel and config it
  Applying: perf tools: Attach eBPF program to perf event
  Applying: perf tools: Suppress probing messages when probing by BPF loading
  Applying: perf record: Add clang options for compiling BPF scripts
  Applying: perf tools: Infrastructure for compiling scriptlets when passing '.c' to --event
  Applying: perf tests: Enforce LLVM test for BPF test
  Applying: perf test: Enable 'perf test' run as test targets
  tools/perf/tests/builtin-test.c:279: trailing whitespace.
  +			/* 
  [acme@zoo linux]$

	After that whitespace thing is fixed, you'll get to a point where 'perf
test -v BPF' will show you all the steps involved in, from a .c file do all the
build process and loading, attaching to a kprobe, etc that we discussed, but
those extra patches need more working before I can submit to you.

	Otherwise, please consider pulling,

- Arnaldo

The following changes since commit 1354ac6ad84395660f551d0614a6ca39e5bfe8e3:

  Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2015-08-07 09:11:30 +0200)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-ebpf-for-mingo

for you to fetch changes up to 9bc898c7019383b6aa2ae6cb2928c4ca926449f0:

  perf tests: Add LLVM test for eBPF on-the-fly compiling (2015-08-07 10:57:24 -0300)

----------------------------------------------------------------
perf/ebpf library + llvm/clang infrastructure

Infrastructure:

- library for interfacing with the kernel eBPF infrastructure, with
  tools/perf/ targeted as a first user (Wang Nan)

- llvm/clang infrastructure for building BPF object files from C source
  code (Wang Nan)

Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

----------------------------------------------------------------
Wang Nan (24):
      bpf tools: Introduce 'bpf' library and add bpf feature check
      bpf tools: Allow caller to set printing function
      bpf tools: Open eBPF object file and do basic validation
      bpf tools: Read eBPF object from buffer
      bpf tools: Check endianness and make libbpf fail early
      bpf tools: Iterate over ELF sections to collect information
      bpf tools: Collect version and license from ELF sections
      bpf tools: Collect map definitions from 'maps' section
      bpf tools: Collect symbol table from SHT_SYMTAB section
      bpf tools: Collect eBPF programs from their own sections
      bpf tools: Collect relocation sections from SHT_REL sections
      bpf tools: Record map accessing instructions for each program
      bpf tools: Add bpf.c/h for common bpf operations
      bpf tools: Create eBPF maps defined in an object file
      bpf tools: Relocate eBPF programs
      bpf tools: Introduce bpf_load_program() to bpf.c
      bpf tools: Load eBPF programs in object files into kernel
      bpf tools: Introduce accessors for struct bpf_program
      bpf tools: Link all bpf objects onto a list
      perf tools: Introduce llvm config options
      perf tools: Call clang to compile C source to object code
      perf tools: Auto detecting kernel build directory
      perf tools: Auto detecting kernel include options
      perf tests: Add LLVM test for eBPF on-the-fly compiling

 tools/build/feature/Makefile    |    6 +-
 tools/build/feature/test-bpf.c  |   18 +
 tools/lib/bpf/.gitignore        |    2 +
 tools/lib/bpf/Build             |    1 +
 tools/lib/bpf/Makefile          |  195 ++++++++
 tools/lib/bpf/bpf.c             |   85 ++++
 tools/lib/bpf/bpf.h             |   23 +
 tools/lib/bpf/libbpf.c          | 1037 +++++++++++++++++++++++++++++++++++++++
 tools/lib/bpf/libbpf.h          |   81 +++
 tools/perf/MANIFEST             |    1 +
 tools/perf/tests/Build          |    1 +
 tools/perf/tests/builtin-test.c |    4 +
 tools/perf/tests/llvm.c         |   98 ++++
 tools/perf/tests/tests.h        |    1 +
 tools/perf/util/Build           |    1 +
 tools/perf/util/config.c        |    4 +
 tools/perf/util/llvm-utils.c    |  408 +++++++++++++++
 tools/perf/util/llvm-utils.h    |   49 ++
 18 files changed, 2014 insertions(+), 1 deletion(-)
 create mode 100644 tools/build/feature/test-bpf.c
 create mode 100644 tools/lib/bpf/.gitignore
 create mode 100644 tools/lib/bpf/Build
 create mode 100644 tools/lib/bpf/Makefile
 create mode 100644 tools/lib/bpf/bpf.c
 create mode 100644 tools/lib/bpf/bpf.h
 create mode 100644 tools/lib/bpf/libbpf.c
 create mode 100644 tools/lib/bpf/libbpf.h
 create mode 100644 tools/perf/tests/llvm.c
 create mode 100644 tools/perf/util/llvm-utils.c
 create mode 100644 tools/perf/util/llvm-utils.h
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