netdev - [PATCH bpf-next v6 0/2] bpf stackmap with build

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Message-ID: <20180314172323.3957483-1-songliubraving@fb.com>
Date:   Wed, 14 Mar 2018 10:23:20 -0700
From:   Song Liu <songliubraving@...com>
To:     <netdev@...r.kernel.org>, <ast@...nel.org>, <peterz@...radead.org>,
        <daniel@...earbox.net>
CC:     <kernel-team@...com>, <hannes@...xchg.org>, <qinteng@...com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH bpf-next v6 0/2] bpf stackmap with build_id+offset

Changes v4 -> v6:

1. When kernel stack is added to stackmap with build_id, use fallback
   mechanism to store ip (status == BPF_STACK_BUILD_ID_IP).

Changes v4 -> v5:

1. Only allow build_id lookup in non-nmi context. Added comment and
   commit message to highlight this limitation.
2. Minor fix reported by kbuild test robot.

Changes v3 -> v4:

1. Add fallback when build_id lookup failed. In this case, status is set
   to BPF_STACK_BUILD_ID_IP, and ip of this entry is saved.
2. Handle cases where vma is only part of the file (vma->vm_pgoff != 0).
   Thanks to Teng for helping me identify this issue!
3. Address feedbacks for previous versions.

Song Liu (2):
  bpf: extend stackmap to save binary_build_id+offset instead of address
  bpf: add selftest for stackmap with BPF_F_STACK_BUILD_ID

 include/uapi/linux/bpf.h                           |  22 ++
 kernel/bpf/stackmap.c                              | 257 +++++++++++++++++++--
 tools/include/uapi/linux/bpf.h                     |  22 ++
 tools/testing/selftests/bpf/Makefile               |  12 +-
 tools/testing/selftests/bpf/test_progs.c           | 164 ++++++++++++-
 .../selftests/bpf/test_stacktrace_build_id.c       |  60 +++++
 tools/testing/selftests/bpf/urandom_read.c         |  22 ++
 7 files changed, 535 insertions(+), 24 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/test_stacktrace_build_id.c
 create mode 100644 tools/testing/selftests/bpf/urandom_read.c

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2.9.5