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

[Guo Ren]

Nice job, thank you :)

On Wed, Sep 4, 2019 at 3:26 PM Greentime Hu <green.hu@xxxxxxxxx> wrote:
>
> 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
> #



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/