Re: [PATCH V6 0/3] riscv: Add perf callchain support

[Greentime Hu]

Mao Han <han_mao@xxxxxxxxx> æ 2019å8æ29æ éå äå2:57åéï
>
> This patch set add perf callchain(FP/DWARF) support for RISC-V.
> It comes from the csky version callchain support with some
> slight modifications. The patchset base on Linux 5.3-rc6.
>
> Changes since v5:
>   - use walk_stackframe from stacktrace.c to handle
>     kernel callchain unwinding(fix invalid mem access)
>
> Changes since v4:
>   - Add missing PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET
>     verified with extra CFLAGS(-Wall -Werror)
>
> Changes since v3:
>   - Add more strict check for unwind_frame_kernel
>   - update for kernel 5.3
>
> Changes since v2:
>   - fix inconsistent comment
>   - force to build kernel with -fno-omit-frame-pointer if perf
>     event is enabled
>
> Changes since v1:
>   - simplify implementation and code convention
>
> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
> Cc: Greentime Hu <green.hu@xxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxx>
> Cc: linux-riscv <linux-riscv@xxxxxxxxxxxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Guo Ren <guoren@xxxxxxxxxx>
>
> Mao Han (3):
>   riscv: Add perf callchain support
>   riscv: Add support for perf registers sampling
>   riscv: Add support for libdw
>
>  arch/riscv/Kconfig                            |  2 +
>  arch/riscv/Makefile                           |  3 +
>  arch/riscv/include/uapi/asm/perf_regs.h       | 42 ++++++++++++
>  arch/riscv/kernel/Makefile                    |  4 +-
>  arch/riscv/kernel/perf_callchain.c            | 95 ++++++++++++++++++++++++++
>  arch/riscv/kernel/perf_regs.c                 | 44 ++++++++++++
>  arch/riscv/kernel/stacktrace.c                |  2 +-
>  tools/arch/riscv/include/uapi/asm/perf_regs.h | 42 ++++++++++++
>  tools/perf/Makefile.config                    |  6 +-
>  tools/perf/arch/riscv/Build                   |  1 +
>  tools/perf/arch/riscv/Makefile                |  4 ++
>  tools/perf/arch/riscv/include/perf_regs.h     | 96 +++++++++++++++++++++++++++
>  tools/perf/arch/riscv/util/Build              |  2 +
>  tools/perf/arch/riscv/util/dwarf-regs.c       | 72 ++++++++++++++++++++
>  tools/perf/arch/riscv/util/unwind-libdw.c     | 57 ++++++++++++++++
>  15 files changed, 469 insertions(+), 3 deletions(-)
>  create mode 100644 arch/riscv/include/uapi/asm/perf_regs.h
>  create mode 100644 arch/riscv/kernel/perf_callchain.c
>  create mode 100644 arch/riscv/kernel/perf_regs.c
>  create mode 100644 tools/arch/riscv/include/uapi/asm/perf_regs.h
>  create mode 100644 tools/perf/arch/riscv/Build
>  create mode 100644 tools/perf/arch/riscv/Makefile
>  create mode 100644 tools/perf/arch/riscv/include/perf_regs.h
>  create mode 100644 tools/perf/arch/riscv/util/Build
>  create mode 100644 tools/perf/arch/riscv/util/dwarf-regs.c
>  create mode 100644 tools/perf/arch/riscv/util/unwind-libdw.c
>

Tested-by: Greentime Hu <greentime.hu@xxxxxxxxxx>

I tested this patchset based on v5.3-rc6 and it can use dwarf or fp to
backtrace in Unleashed board.

# perf record -e cpu-clock --call-graph dwarf ls -l /
total 4
drwxr-xr-x    2 root     root             0 Aug 26  2019 bin
drwxr-xr-x    5 root     root         12720 Jan  1 00:00 dev
drwxr-xr-x    5 root     root             0 Jan  1 00:00 etc
-rwxr-xr-x    1 root     root           178 Aug 26  2019 init
drwxr-xr-x    2 root     root             0 Aug 26  2019 lib
lrwxrwxrwx    1 root     root             3 Aug 19  2019 lib64 -> lib
lrwxrwxrwx    1 root     root            11 Aug 19  2019 linuxrc -> bin/busybox
drwxr-xr-x    2 root     root             0 Aug 19  2019 media
drwxr-xr-x    2 root     root             0 Aug 19  2019 mnt
drwxr-xr-x    2 root     root             0 Aug 19  2019 opt
dr-xr-xr-x   66 root     root             0 Jan  1 00:00 proc
drwx------    3 root     root             0 Jan  1 00:01 root
drwxr-xr-x    3 root     root           140 Jan  1 00:00 run
drwxr-xr-x    2 root     root             0 Aug 19  2019 sbin
dr-xr-xr-x   11 root     root             0 Jan  1 00:00 sys
drwxrwxrwt    2 root     root            60 Jan  1 00:00 tmp
drwxr-xr-x    6 root     root             0 Aug 26  2019 usr
drwxr-xr-x    4 root     root             0 Aug 26  2019 var
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.175 MB perf.data (21 samples) ]

# perf record -e cpu-clock --call-graph fp ls -l /
total 4
drwxr-xr-x    2 root     root             0 Aug 26  2019 bin
drwxr-xr-x    5 root     root         12720 Jan  1 00:00 dev
drwxr-xr-x    5 root     root             0 Jan  1 00:00 etc
-rwxr-xr-x    1 root     root           178 Aug 26  2019 init
drwxr-xr-x    2 root     root             0 Aug 26  2019 lib
lrwxrwxrwx    1 root     root             3 Aug 19  2019 lib64 -> lib
lrwxrwxrwx    1 root     root            11 Aug 19  2019 linuxrc -> bin/busybox
drwxr-xr-x    2 root     root             0 Aug 19  2019 media
drwxr-xr-x    2 root     root             0 Aug 19  2019 mnt
drwxr-xr-x    2 root     root             0 Aug 19  2019 opt
dr-xr-xr-x   66 root     root             0 Jan  1 00:00 proc
drwx------    3 root     root             0 Jan  1 00:00 root
drwxr-xr-x    3 root     root           140 Jan  1 00:00 run
drwxr-xr-x    2 root     root             0 Aug 19  2019 sbin
dr-xr-xr-x   11 root     root             0 Jan  1 00:00 sys
drwxrwxrwt    2 root     root            60 Jan  1 00:00 tmp
drwxr-xr-x    6 root     root             0 Aug 26  2019 usr
drwxr-xr-x    4 root     root             0 Aug 26  2019 var
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.004 MB perf.data (19 samples) ]

# perf test
 1: vmlinux symtab matches kallsyms            : Skip
 2: Detect openat syscall event                : FAILED!
 3: Detect openat syscall event on all cpus    : FAILED!
 4: Read samples using the mmap interface      : FAILED!
 5: Test data source output                    : Ok
 6: Parse event definition strings             : FAILED!
 7: Simple expression parser                   : Ok
 8: PERF_RECORD_* events & perf_sample fields  : FAILED!
 9: Parse perf pmu format                      : Ok
10: DSO data read                              : Ok
11: DSO data cache                             : Ok
12: DSO data reopen                            : Ok
13: Roundtrip evsel->name                      : Ok
14: Parse sched tracepoints fields             : Ok
15: syscalls:sys_enter_openat event fields     : FAILED!
16: Setup struct perf_event_attr               : Skip
17: Match and link multiple hists              : Ok
18: 'import perf' in python                    : FAILED!
19: Breakpoint overflow signal handler         : FAILED!
20: Breakpoint overflow sampling               : FAILED!
21: Breakpoint accounting                      : Skip
22: Watchpoint                                 :
22.1: Read Only Watchpoint                     : FAILED!
22.2: Write Only Watchpoint                    : FAILED!
22.3: Read / Write Watchpoint                  : FAILED!
22.4: Modify Watchpoint                        : FAILED!
23: Number of exit events of a simple workload : Ok
24: Software clock events period values        : Ok
25: Object code reading                        : Ok
26: Sample parsing                             : Ok
27: Use a dummy software event to keep tracking: Ok
28: Parse with no sample_id_all bit set        : Ok
29: Filter hist entries                        : Ok
30: Lookup mmap thread                         : Ok
31: Share thread mg                            : Ok
32: Sort output of hist entries                : Ok
33: Cumulate child hist entries                : Ok
34: Track with sched_switch                    : FAILED!
35: Filter fds with revents mask in a fdarray  : Ok
36: Add fd to a fdarray, making it autogrow    : Ok
37: kmod_path__parse                           : Ok
38: Thread map                                 : Ok
39: LLVM search and compile                    :
39.1: Basic BPF llvm compile                    : Skip
39.2: kbuild searching                          : Skip
39.3: Compile source for BPF prologue generation: Skip
39.4: Compile source for BPF relocation         : Skip
40: Session topology                           : FAILED!
41: BPF filter                                 :
41.1: Basic BPF filtering                      : Skip
41.2: BPF pinning                              : Skip
41.3: BPF prologue generation                  : Skip
41.4: BPF relocation checker                   : Skip
42: Synthesize thread map                      : Ok
43: Remove thread map                          : Ok
44: Synthesize cpu map                         : Ok
45: Synthesize stat config                     : Ok
46: Synthesize stat                            : Ok
47: Synthesize stat round                      : Ok
48: Synthesize attr update                     : Ok
49: Event times                                : Ok
50: Read backward ring buffer                  : Skip
51: Print cpu map                              : Ok
52: Probe SDT events                           : Skip
53: is_printable_array                         : Ok
54: Print bitmap                               : Ok
55: perf hooks                                 : Ok
56: builtin clang support                      : Skip (not compiled in)
57: unit_number__scnprintf                     : Ok
58: mem2node                                   : Ok
59: time utils                                 : Ok
60: map_groups__merge_in                       : Ok
#