perf-tools changes for v6.13

Hi Linus,

Please consider pulling the following changes in perf tools for v6.13.

Thanks,
Namhyung

The following changes since commit 59b723cd2adbac2a34fc8e12c74ae26ae45bf230:

Linux 6.12-rc6 (2024-11-03 14:05:52 -1000)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools.git tags/perf-tools-for-v6.13-2024-11-24

for you to fetch changes up to 6d78089da9805787a72e52604ad4b2ed7380be3f:

perf tests: Fix hwmon parsing with PMU name test (2024-11-22 13:38:39 -0800)

----------------------------------------------------------------
perf tools changes for v6.13

perf record
-----------
* Enable leader sampling for inherited task events. It was supported only for system-wide events but the kernel started to support such a setup since v6.12.

This is to reduce the number of PMU interrupts. The samples of the leader event will contain counts of other events and no samples will be generated for the other member events.

    $ perf record -e '{cycles,instructions}:S'  ${MYPROG}

perf report
-----------
* Fix --branch-history option to display more branch-related information like prediction, abort and cycles which is available on Intel machines.

    $ perf record -bg -- perf test -w brstack

    $ perf report --branch-history
    ...
    #
    # Overhead  Source:Line               Symbol          Shared Object         Predicted  Abort  Cycles  IPC   [IPC Coverage]
    # ........  ........................  ..............  ....................  .........  .....  ......  ....................
    #
         8.17%  copy_page_64.S:19         [k] copy_page   [kernel.kallsyms]     50.0%      0      5       -      -
                |
                ---xas_load xarray.h:171
                   |
                   |--5.68%--xas_load xarray.c:245 (cycles:1)
                   |          xas_load xarray.c:242
                   |          xas_load xarray.h:1260 (cycles:1)
                   |          xas_descend xarray.c:146
                   |          xas_load xarray.c:244 (cycles:2)
                   |          xas_load xarray.c:245
                   |          xas_descend xarray.c:218 (cycles:10)
    ...

perf stat
---------
* Add HWMON PMU support. The HWMON provides various system information like CPU/GPU temperature, fan speed and so on. Expose them as PMU events so that users can see the values using perf stat commands.

    $ perf stat -e temp_cpu,fan1 true

     Performance counter stats for 'true':

                 60.00 'C   temp_cpu
                     0 rpm  fan1

           0.000745382 seconds time elapsed

           0.000883000 seconds user
           0.000000000 seconds sys

* Display metric threshold in JSON output. Some metrics define thresholds to classify value ranges. It used to be in a different color but it won't work for JSON. Add "metric-threshold" field to the JSON that can be one of "good", "less good", "nearly bad" and "bad".

    # perf stat -a -M TopdownL1 -j true
    {"counter-value" : "18693525.000000", "unit" : "", "event" : "TOPDOWN.SLOTS", "event-runtime" : 5552708, "pcnt-running" : 100.00, "metric-value" : "43.226002", "metric-unit" : "%  tma_backend_bound", "metric-threshold" : "bad"}
    {"metric-value" : "29.212267", "metric-unit" : "%  tma_frontend_bound", "metric-threshold" : "bad"}
    {"metric-value" : "7.138972", "metric-unit" : "%  tma_bad_speculation", "metric-threshold" : "good"}
    {"metric-value" : "20.422759", "metric-unit" : "%  tma_retiring", "metric-threshold" : "good"}
    {"counter-value" : "3817732.000000", "unit" : "", "event" : "topdown-retiring", "event-runtime" : 5552708, "pcnt-running" : 100.00, }
    {"counter-value" : "5472824.000000", "unit" : "", "event" : "topdown-fe-bound", "event-runtime" : 5552708, "pcnt-running" : 100.00, }
    {"counter-value" : "7984780.000000", "unit" : "", "event" : "topdown-be-bound", "event-runtime" : 5552708, "pcnt-running" : 100.00, }
    {"counter-value" : "1418181.000000", "unit" : "", "event" : "topdown-bad-spec", "event-runtime" : 5552708, "pcnt-running" : 100.00, }
    ...

perf sched
----------
* Add -P/--pre-migrations option for 'timehist' sub-command to track time a task waited on a run-queue before migrating to a different CPU.

    $ perf sched timehist -P
               time    cpu  task name                       wait time  sch delay   run time  pre-mig time
                            [tid/pid]                          (msec)     (msec)     (msec)     (msec)
    --------------- ------  ------------------------------  ---------  ---------  ---------  ---------
      585940.535527 [0000]  perf[584885]                        0.000      0.000      0.000      0.000
      585940.535535 [0000]  migration/0[20]                     0.000      0.002      0.008      0.000
      585940.535559 [0001]  perf[584885]                        0.000      0.000      0.000      0.000
      585940.535563 [0001]  migration/1[25]                     0.000      0.001      0.004      0.000
      585940.535678 [0002]  perf[584885]                        0.000      0.000      0.000      0.000
      585940.535686 [0002]  migration/2[31]                     0.000      0.002      0.008      0.000
      585940.535905 [0001]  <idle>                              0.000      0.000      0.342      0.000
      585940.535938 [0003]  perf[584885]                        0.000      0.000      0.000      0.000
      585940.537048 [0001]  sleep[584886]                       0.000      0.019      1.142      0.001
      585940.537749 [0002]  <idle>                              0.000      0.000      2.062      0.000
    ...

Build
-----
* Make libunwind opt-in (LIBUNWIND=1) rather than opt-out. The perf tools are generally built with libelf and libdw which has unwinder functionality. The libunwind support predates it and no need to have duplicate unwinders by default.

* Rename NO_DWARF=1 build option to NO_LIBDW=1 in order to clarify it's using libdw for handling DWARF information.

Internals
---------
* Do not set exclude_guest bit in the perf_event_attr by default. This was causing a trouble in AMD IBS PMU as it doesn't support the bit. The bit will be set when it's needed later by the fallback logic. Also update the missing feature detection logic to make sure not clear supported bits unnecessarily.

* Run perf test in parallel by default and mark flaky tests "exclusive" to run them serially at the end. Some test numbers are changed but the test can complete in less than half the time.

JSON vendor events
------------------
* Add AMD Zen 5 events and metrics.

* Add i.MX91 and i.MX95 DDR metrics

* Fix HiSilicon HIP08 Topdown metric name.

* Support compat events on PowerPC.

----------------------------------------------------------------
Akihiko Odaki (1):
libperf: Explicitly specify install-html dependencies

Andrew Kreimer (1):

      perf tools: Fix typos Muliplier -> Multiplier

Arnaldo Carvalho de Melo (12):
perf test: Introduce workloads__for_each()
perf test: Introduce --list-workloads to list the available workloads perf test: Document the -w/--workload option
perf probe: Fix retrieval of source files from a debuginfod server
perf ftrace latency: Fix unit on histogram first entry when using --use-nsec perf test: Remove dangling CFLAGS for removed attr.o object
perf disasm: Introduce symbol__disassemble_objdump()
perf disasm: Define stubs for the LLVM and capstone disassemblers
perf disasm: Allow configuring what disassemblers to use
perf test shell trace_exit_race: Show what went wrong in verbose mode perf test shell trace_exit_race: Use --no-comm to avoid cases where COMM isn't resolved perf tests hwmon_pmu: Remove double evlist__delete()

Athira Rajeev (4):
tools/perf/tests: Fix compilation error with strncpy in tests/tool_pmu tools/perf/tests: Remove duplicate evlist__delete in tests/tool_pmu.c tools/perf/pmu-events/powerpc: Add support for compat events in json tools/perf/powerpc/util: Add support to handle compatible mode PVR for perf json events

Ben Gainey (2):
tools/perf: Correctly calculate sample period for inherited SAMPLE_READ values tools/perf: Allow inherit + PERF_SAMPLE_READ when opening events

Benjamin Peterson (4):
perf trace: avoid garbage when not printing a trace event's arguments perf trace: Do not lose last events in a race
perf trace: Avoid garbage when not printing a syscall's arguments perf tests: Add test for trace output loss

Besar Wicaksono (1):
perf arm-spe: Add Neoverse-V2 to common data source encoding list

Björn Töpel (1):
perf, riscv: Wire up perf trace support for RISC-V

Brian Geffon (1):
perf tools: sched-pipe bench: add (-n) nonblocking benchmark

Charlie Jenkins (1):
perf tools: Add all shellcheck_log to gitignore

Dapeng Mi (8):
perf x86/topdown: Complete topdown slots/metrics events check perf x86/topdown: Correct leader selection with sample_read enabled perf x86/topdown: Don't move topdown metric events in group perf tests: Add leader sampling test in record tests perf tests: Add topdown events counting and sampling tests perf tests: Add more topdown events regroup tests
perf x86/topdown: Make topdown metrics comparators be symmetric perf x86/topdown: Refine helper arch_is_topdown_metrics()

Dr. David Alan Gilbert (5):
perf probe: Remove unused add_perf_probe_events perf tools: Remove unused color_fwrite_lines
perf: event: Remove deadcode
perf util: Remove kernel version deadcode
perf: Remove unused del_perf_probe_events()

Graham Woodward (4):
perf arm-spe: Set sample.addr to target address for instruction sample perf arm-spe: Use ARM_SPE_OP_BRANCH_ERET when synthesizing branches perf arm-spe: Correctly set sample flags
perf arm-spe: Update --itrace help text

Haiyue Wang (1):
perf tools: Add the empty-pmu-events build to .gitignore

Hao Ge (1):
perf bpf-filter: Return -ENOMEM directly when pfi allocation fails

Howard Chu (2):
perf test: Delete unused Intel CQM test
perf trace: Fix tracing itself, creating feedback loops

Ian Rogers (96):
perf test: Be more tolerant of metricgroup failures
perf test: Ignore security failures in all PMU test
perf evsel: Add alternate_hw_config and use in evsel__match
perf stat: Uniquify event name improvements
perf stat: Remove evlist__add_default_attrs use strings
perf evsel x86: Make evsel__has_perf_metrics work for legacy events perf evsel: Remove pmu_name
perf evsel: Reduce a variables scope
perf stat: Fix affinity memory leaks on error path
perf test: Fix memory leaks on event-times error paths
perf test: Skip not fail tp fields test when insufficient permissions perf test: Skip not fail syscall tp fields test when insufficient permissions perf pmu: Simplify an asprintf error message
perf pmu: Allow hardcoded terms to be applied to attributes
perf parse-events: Expose/rename config_term_name
perf tool_pmu: Factor tool events into their own PMU
perf tool_pmu: Rename enum perf_tool_event to tool_pmu_event perf tool_pmu: Rename perf_tool_event__* to tool_pmu__*
perf tool_pmu: Move expr literals to tool_pmu
perf jevents: Add tool event json under a common architecture perf tool_pmu: Switch to standard pmu functions and json descriptions perf tests: Add tool PMU test
perf tool_pmu: Remove duplicate io.h header
perf disasm: Fix capstone memory leak
perf probe: Fix libdw memory leak
perf color: Add printf format checking and resolve issues
perf stat: Fix/add parameter names for print_metric
perf stat: Display "none" for NaN with metric only json
perf stat: Drop metric-unit if unit is NULL
perf stat: Change color to threshold in print_metric
perf stat: Add metric-threshold to json output
perf stat: Disable metric thresholds for CSV and JSON metric-only mode perf test: Add a shell wrapper for "Setup struct perf_event_attr" perf test: Remove C test wrapper for attr.py
perf test: Move attr files into shell directory where they are used perf build: Fix LIBDW_DIR
perf build: Rename NO_DWARF to NO_LIBDW
perf build: Remove defined but never used variable
perf build: Rename test-dwarf to test-libdw
perf build: Combine libdw-dwarf-unwind into libdw feature tests perf build: Combine test-dwarf-getlocations into test-libdw
perf build: Combine test-dwarf-getcfi into test-libdw
perf probe: Move elfutils support check to libdw check
perf libdw: Remove unnecessary defines
perf build: Rename HAVE_DWARF_SUPPORT to HAVE_LIBDW_SUPPORT
perf build: Rename CONFIG_DWARF to CONFIG_LIBDW
tools subcmd: Add non-waitpid check_if_command_finished()
perf test: Display number of active running tests
perf test: Reduce scope of parallel variable
perf test: Avoid list test blocking on writing to stdout
perf test: Tag parallel failing shell tests with "(exclusive)" perf test: Add a signal handler around running a test
perf test: Run parallel tests in two passes
perf test: Make parallel testing the default
perf test: Add a signal handler to kill forked child processes perf test: Sort tests placing exclusive tests last
perf build: Make libunwind opt-in rather than opt-out
perf stat: Expand metric+unit buffer size
tools api io: Ensure line_len_out is always initialized
perf hwmon_pmu: Add hwmon filename parser
perf test: Add hwmon filename parser test
perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs perf pmu: Add calls enabling the hwmon_pmu
perf test: Add hwmon "PMU" test
perf docs: Document tool and hwmon events
perf bpf-prologue: Remove unused file
perf dwarf-regs: Remove PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET perf dwarf-regs: Add EM_HOST and EF_HOST defines
perf disasm: Add e_machine/e_flags to struct arch
perf dwarf-regs: Pass accurate disassembly machine to get_dwarf_regnum perf dwarf-regs: Pass ELF flags to get_dwarf_regstr
perf dwarf-regs: Move x86 dwarf-regs out of arch
perf arm64: Remove dwarf-regs.c
perf arm: Remove dwarf-regs.c
perf dwarf-regs: Move csky dwarf-regs out of arch
perf loongarch: Remove dwarf-regs.c
perf mips: Remove dwarf-regs.c
perf dwarf-regs: Move powerpc dwarf-regs out of arch
perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h
perf s390: Remove dwarf-regs.c
perf sh: Remove dwarf-regs.c
perf sparc: Remove dwarf-regs.c
perf xtensa: Remove dwarf-regs.c
perf dwarf-regs: Remove get_arch_regstr code
perf build: Remove PERF_HAVE_DWARF_REGS
perf test: Add missing __exit calls in tool/hwmon tests
perf header: Move is_cpu_online to numa bench
perf header: Refactor get_cpuid to take a CPU for ARM
perf arm64 header: Use cpu argument in get_cpuid
perf header: Avoid transitive PMU includes
perf header: Pass a perf_cpu rather than a PMU to get_cpuid_str perf jevents: Add map_for_cpu()
perf pmu: Move pmu_metrics_table__find and remove ARM override perf test: Correct hwmon test PMU detection
perf hwmon_pmu: Ensure hwmon key union is zeroed before use
perf tests: Fix hwmon parsing with PMU name test

James Clark (11):
perf cs-etm: Don't flush when packet_queue fills up perf cs-etm: Use new OpenCSD consistency checks
perf scripting python: Add function to get a config value perf scripts python cs-etm: Update to use argparse perf scripts python cs-etm: Improve arguments
perf scripts python cs-etm: Add start and stop arguments perf test: cs-etm: Test Coresight disassembly script perf test: Make stat test work on DT devices
perf test: Add a test for default perf stat command perf arm-spe: Use old behavior when opening old SPE files perf tests: Make leader sampling test work without branch event

Jean-Philippe Romain (1):
perf list: Fix topic and pmu_name argument order

Jiapeng Chong (1):
perf test: Use ARRAY_SIZE for array length

Kan Liang (1):
perf jevents: Don't stop at the first matched pmu when searching a events table

Leo Yan (15):
perf arm-spe: Define metadata header version 2
perf arm-spe: Calculate meta data size
perf arm-spe: Save per CPU information in metadata perf arm-spe: Support metadata version 2
perf arm-spe: Dump metadata with version 2
perf arm-spe: Rename arm_spe__synth_data_source_generic() perf arm-spe: Rename the common data source encoding perf arm-spe: Introduce arm_spe__is_homogeneous()
perf arm-spe: Use metadata to decide the data source feature perf arm-spe: Remove the unused 'midr' field
perf arm-spe: Add Cortex CPUs to common data source encoding list perf probe: Use the MAX_EVENT_NAME_LEN macro
perf probe: Check group string length
perf probe: Improve log for long event name failure perf probe: Correct demangled symbols in C++ program

Levi Yun (2):
perf stat: Close cork_fd when create_perf_stat_counter() failed perf stat: Stop repeating when ref_perf_stat() returns -1

Li Huafei (3):
perf disasm: Use disasm_line__free() to properly free disasm_line perf disasm: Use disasm_line__free() to properly free disasm_line perf disasm: Fix not cleaning up disasm_line in symbol__disassemble_raw()

Luo Yifan (2):
perf timechart: Remove redundant variable assignment
libsubcmd: Move va_end() before exit

Madadi Vineeth Reddy (2):
perf sched replay: Remove unused parts of the code perf sched timehist: Add pre-migration wait time option

Masami Hiramatsu (Google) (5):
perf probe: Fix error message for failing to find line range perf probe: Fix to ignore escaped characters in --lines option perf probe: Accept FUNC@* to specify function name explicitly perf string: Add strpbrk_esq() and strdup_esq() for escape and quote perf probe: Introduce quotation marks support

Masum Reza (1):
perf evsel: display dmesg command of showing a hardcoded path

Michael Petlan (2):
perf trace: Keep exited threads for summary perf test: Remove cpu-list BPF cgroup counter test

Namhyung Kim (19):
perf symbol: Do not fixup end address of labels
perf tools: Fix compiler error in util/tool_pmu.c Merge tag 'v6.12-rc3' into perf-tools-next
perf tools: Fix possible compiler warnings in hashmap perf tools: Remove unnecessary parentheses
perf evsel: Fix missing inherit + sample read check perf test: Speed up some tests using perf list
perf test: Update all metrics test like metricgroups test perf tools: Add fallback for exclude_guest
perf tools: Don't set attr.exclude_guest by default perf tools: Simplify evsel__add_modifier()
perf tools: Do not set exclude_guest for precise_ip perf tools: Detect missing kernel features properly perf tools: Move x86__is_amd_cpu() to util/env.c
perf tools: Check fallback error and order
perf record: Just use "cycles:P" as the default event perf test: Add precise_max subtest to the perf record shell test Merge 'origin/master' into perf-tools-next
perf test: Fix ftrace test with regex patterns

Sandipan Das (3):
perf vendor events amd: Add Zen 5 data fabric events perf vendor events amd: Add Zen 5 data fabric metrics perf vendor events amd: Update Zen 5 data cache fill events

Steve Clevenger (2):
perf script cs_etm: Add map_pgoff to python dictionary perf script python: Adjust objdump start/end per map pgoff parameter

Tengda Wu (2):
perf stat: Support inherit events during fork() for bperf perf test: Use sqrtloop workload to test bperf event

Thomas Falcon (3):
perf mem: Fix printing PERF_MEM_LVLNUM_{L2_MHB|MSC}
perf test x86: Fix typo in intel-pt-test
perf report: Display columns Predicted/Abort/Cycles in --branch-history

Thomas Richter (4):
perf/test: Speed up test case perf annotate basic tests perf/test: perf test 86 fails on s390
perf test: Fix perf test case 84 on s390 perf/test: fix perf ftrace test on s390

Veronika Molnarova (3):
perf test: Restore sample rate for perf_event_attr perf test attr: Add back missing topdown events perf dso: Fix symtab_type for kmod compression

Xu Yang (3):
perf vendor events arm64: imx95: add imx95_bandwidth_usage.lpddr4x metric perf vendor events arm64: Add i.MX91 DDR Performance Monitor metrics perf jevents: fix breakage when do perf stat on system metric

Yicong Yang (3):
perf vender events arm64: Use "Topdown" as topdown metric group name perf build: Add missing cflags when building with custom libtraceevent perf build: Include libtraceevent headers directly indicated by pkg-config

Yoshihiro Furudera (1):
perf list: update option desc in man page

 tools/build/Makefile.feature                       |   11 +-
 tools/build/feature/Makefile                       |   24 +-
 tools/build/feature/test-all.c                     |   16 +-
 tools/build/feature/test-dwarf.c                   |   11 -
 tools/build/feature/test-dwarf_getcfi.c            |    9 -
 tools/build/feature/test-dwarf_getlocations.c      |   13 -
 tools/build/feature/test-libdw-dwarf-unwind.c      |   14 -
 tools/build/feature/test-libdw.c                   |   56 +
 tools/build/feature/test-libtraceevent.c           |    2 +-
 tools/lib/api/io.h                                 |    1 +
 tools/lib/perf/Documentation/Makefile              |    2 +-
 tools/lib/perf/evsel.c                             |   48 +
 tools/lib/perf/include/internal/evsel.h            |   63 +-
 tools/lib/subcmd/run-command.c                     |   33 +
 tools/lib/subcmd/subcmd-util.h                     |    2 +-
 tools/perf/.gitignore                              |    6 +-
 tools/perf/Documentation/itrace.txt                |    2 +-
 tools/perf/Documentation/perf-arm-spe.txt          |    2 +-
 tools/perf/Documentation/perf-check.txt            |    6 +-
 tools/perf/Documentation/perf-config.txt           |   13 +
 tools/perf/Documentation/perf-list.txt             |   17 +-
 tools/perf/Documentation/perf-report.txt           |    8 +
 tools/perf/Documentation/perf-sched.txt            |    8 +
 tools/perf/Documentation/perf-script-python.txt    |    2 +-
 tools/perf/Documentation/perf-test.txt             |   17 +
 tools/perf/Makefile.config                         |   70 +-
 tools/perf/Makefile.perf                           |    9 +-
 tools/perf/arch/arc/annotate/instructions.c        |    2 +
 tools/perf/arch/arm/Makefile                       |    3 -
 tools/perf/arch/arm/annotate/instructions.c        |    2 +
 tools/perf/arch/arm/util/Build                     |    2 -
 tools/perf/arch/arm/util/dwarf-regs.c              |   61 -
 tools/perf/arch/arm64/Makefile                     |    4 -
 tools/perf/arch/arm64/annotate/instructions.c      |    2 +
 tools/perf/arch/arm64/util/Build                   |    1 -
 tools/perf/arch/arm64/util/arm-spe.c               |  116 +-
 tools/perf/arch/arm64/util/dwarf-regs.c            |   92 --
 tools/perf/arch/arm64/util/header.c                |   73 +-
 tools/perf/arch/arm64/util/pmu.c                   |   25 +-
 tools/perf/arch/csky/Makefile                      |    4 -
 tools/perf/arch/csky/annotate/instructions.c       |    7 +-
 tools/perf/arch/csky/util/Build                    |    1 -
 tools/perf/arch/loongarch/Makefile                 |    4 -
 tools/perf/arch/loongarch/annotate/instructions.c  |    2 +
 tools/perf/arch/loongarch/util/Build               |    1 -
 tools/perf/arch/loongarch/util/dwarf-regs.c        |   44 -
 tools/perf/arch/loongarch/util/header.c            |    4 +-
 tools/perf/arch/mips/Makefile                      |    4 -
 tools/perf/arch/mips/annotate/instructions.c       |    2 +
 tools/perf/arch/mips/util/Build                    |    1 -
 tools/perf/arch/mips/util/dwarf-regs.c             |   38 -
 tools/perf/arch/powerpc/Makefile                   |    5 -
 tools/perf/arch/powerpc/annotate/instructions.c    |    6 +-
 tools/perf/arch/powerpc/util/Build                 |    3 +-
 tools/perf/arch/powerpc/util/dwarf-regs.c          |  153 --
 tools/perf/arch/powerpc/util/header.c              |   36 +-
 tools/perf/arch/riscv/Makefile                     |   27 +-
 tools/perf/arch/riscv/entry/syscalls/mksyscalltbl  |   47 +
 tools/perf/arch/riscv/include/dwarf-regs-table.h   |   42 +
 tools/perf/arch/riscv/util/Build                   |    1 -
 tools/perf/arch/riscv/util/dwarf-regs.c            |   72 -
 tools/perf/arch/riscv/util/header.c                |    4 +-
 tools/perf/arch/riscv64/annotate/instructions.c    |    2 +
 tools/perf/arch/s390/Makefile                      |    4 -
 tools/perf/arch/s390/annotate/instructions.c       |    2 +
 tools/perf/arch/s390/util/Build                    |    1 -
 tools/perf/arch/s390/util/dwarf-regs.c             |   43 -
 tools/perf/arch/s390/util/header.c                 |    6 +-
 tools/perf/arch/sh/Build                           |    1 -
 tools/perf/arch/sh/Makefile                        |    4 -
 tools/perf/arch/sh/util/Build                      |    1 -
 tools/perf/arch/sh/util/dwarf-regs.c               |   41 -
 tools/perf/arch/sparc/Build                        |    1 -
 tools/perf/arch/sparc/Makefile                     |    4 -
 tools/perf/arch/sparc/annotate/instructions.c      |    2 +
 tools/perf/arch/sparc/util/Build                   |    1 -
 tools/perf/arch/sparc/util/dwarf-regs.c            |   39 -
 tools/perf/arch/x86/Makefile                       |    4 -
 tools/perf/arch/x86/annotate/instructions.c        |    5 +-
 tools/perf/arch/x86/tests/intel-cqm.c              |  128 --
 tools/perf/arch/x86/tests/intel-pt-test.c          |    4 +-
 tools/perf/arch/x86/util/Build                     |    4 -
 tools/perf/arch/x86/util/auxtrace.c                |    3 +-
 tools/perf/arch/x86/util/dwarf-regs.c              |  153 --
 tools/perf/arch/x86/util/env.c                     |   19 -
 tools/perf/arch/x86/util/env.h                     |    7 -
 tools/perf/arch/x86/util/evlist.c                  |  147 +-
 tools/perf/arch/x86/util/evsel.c                   |   38 +-
 tools/perf/arch/x86/util/header.c                  |    5 +-
 tools/perf/arch/x86/util/intel-pt.c                |    3 +-
 tools/perf/arch/x86/util/iostat.c                  |    2 +-
 tools/perf/arch/x86/util/pmu.c                     |    2 +-
 tools/perf/arch/x86/util/topdown.c                 |   43 +-
 tools/perf/arch/x86/util/topdown.h                 |    2 +
 tools/perf/arch/x86/util/tsc.c                     |   18 +-
 tools/perf/arch/xtensa/Build                       |    1 -
 tools/perf/arch/xtensa/Makefile                    |    4 -
 tools/perf/arch/xtensa/util/Build                  |    1 -
 tools/perf/arch/xtensa/util/dwarf-regs.c           |   21 -
 tools/perf/bench/numa.c                            |   53 +
 tools/perf/bench/sched-pipe.c                      |   43 +-
 tools/perf/builtin-annotate.c                      |    2 +-
 tools/perf/builtin-check.c                         |    6 +-
 tools/perf/builtin-diff.c                          |    6 +-
 tools/perf/builtin-ftrace.c                        |    2 +-
 tools/perf/builtin-kmem.c                          |    2 +-
 tools/perf/builtin-kvm.c                           |    5 +-
 tools/perf/builtin-kwork.c                         |    2 +-
 tools/perf/builtin-list.c                          |   17 +-
 tools/perf/builtin-probe.c                         |   14 +-
 tools/perf/builtin-record.c                        |    4 +-
 tools/perf/builtin-report.c                        |   12 +-
 tools/perf/builtin-sched.c                         |  116 +-
 tools/perf/builtin-script.c                        |    9 +-
 tools/perf/builtin-stat.c                          |  396 +++--
 tools/perf/builtin-timechart.c                     |    3 +-
 tools/perf/builtin-trace.c                         |   27 +-
 tools/perf/dlfilters/dlfilter-test-api-v0.c        |    2 +-
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 tools/perf/perf.c                                  |    2 -
 .../arch/arm64/freescale/imx91/sys/ddrc.json       |    9 +
 .../arch/arm64/freescale/imx91/sys/metrics.json    |   26 +
 .../arch/arm64/freescale/imx95/sys/metrics.json    |    8 +
 .../arch/arm64/hisilicon/hip08/metrics.json        |   74 +-
 tools/perf/pmu-events/arch/common/common/tool.json |   74 +
 .../arch/powerpc/compat/generic-events.json        |  117 ++
 tools/perf/pmu-events/arch/powerpc/mapfile.csv     |    1 +
 .../pmu-events/arch/x86/amdzen5/data-fabric.json   | 1634 ++++++++++++++++++++
 .../pmu-events/arch/x86/amdzen5/load-store.json    |   78 +-
 .../pmu-events/arch/x86/amdzen5/recommended.json   |  112 ++
 tools/perf/pmu-events/empty-pmu-events.c           |  249 +--
 tools/perf/pmu-events/jevents.py                   |   57 +-
 tools/perf/pmu-events/pmu-events.h                 |    2 +-
 .../perf/scripts/python/Perf-Trace-Util/Context.c  |   11 +
 tools/perf/scripts/python/arm-cs-trace-disasm.py   |  143 +-
 tools/perf/tests/Build                             |    4 +-
 tools/perf/tests/attr.c                            |  218 ---
 tools/perf/tests/builtin-test.c                    |  438 ++++--
 tools/perf/tests/demangle-java-test.c              |    3 +-
 tools/perf/tests/event-times.c                     |    5 +-
 tools/perf/tests/evsel-tp-sched.c                  |   42 +-
 tools/perf/tests/expr.c                            |    5 +-
 tools/perf/tests/hwmon_pmu.c                       |  342 ++++
 tools/perf/tests/make                              |    6 +-
 tools/perf/tests/openat-syscall-tp-fields.c        |   19 +-
 tools/perf/tests/parse-events.c                    |   32 +-
 tools/perf/tests/pmu.c                             |    3 +-
 tools/perf/tests/shell/annotate.sh                 |   10 +-
 tools/perf/tests/shell/attr.sh                     |   22 +
 tools/perf/tests/{ => shell}/attr/README           |    2 +
 tools/perf/tests/{ => shell}/attr/base-record      |    0
 tools/perf/tests/{ => shell}/attr/base-record-spe  |    0
 tools/perf/tests/{ => shell}/attr/base-stat        |    0
 .../perf/tests/{ => shell}/attr/system-wide-dummy  |    0
 tools/perf/tests/{ => shell}/attr/test-record-C0   |    2 +
 .../perf/tests/{ => shell}/attr/test-record-basic  |    0
 .../tests/{ => shell}/attr/test-record-branch-any  |    0
 .../{ => shell}/attr/test-record-branch-filter-any |    0
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 tools/perf/tests/{ => shell}/attr/test-record-data |    0
 .../tests/{ => shell}/attr/test-record-dummy-C0    |    4 +-
 tools/perf/tests/{ => shell}/attr/test-record-freq |    0
 .../{ => shell}/attr/test-record-graph-default     |    0
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 .../tests/{ => shell}/attr/test-record-graph-dwarf |    0
 .../tests/{ => shell}/attr/test-record-graph-fp    |    0
 .../{ => shell}/attr/test-record-graph-fp-aarch64  |    0
 .../{ => shell}/attr/test-record-group-sampling    |    3 +-
 .../tests/shell/attr/test-record-group-sampling1   |   50 +
 .../tests/shell/attr/test-record-group-sampling2   |   61 +
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 .../{ => shell}/attr/test-record-no-buffering      |    0
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 .../perf/tests/{ => shell}/attr/test-stat-default  |   90 +-
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 tools/perf/tests/shell/ftrace.sh                   |    4 +-
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 tools/perf/tests/shell/trace+probe_vfs_getname.sh  |    4 +-
 tools/perf/tests/shell/trace_exit_race.sh          |   51 +
 tools/perf/tests/task-exit.c                       |    9 +-
 tools/perf/tests/tests-scripts.c                   |    7 +-
 tools/perf/tests/tests.h                           |   11 +
 tools/perf/tests/tool_pmu.c                        |  111 ++
 tools/perf/util/Build                              |   17 +-
 tools/perf/util/annotate-data.h                    |    8 +-
 tools/perf/util/annotate.c                         |   12 +-
 tools/perf/util/annotate.h                         |    6 +
 tools/perf/util/arm-spe-decoder/arm-spe-decoder.h  |   18 +-
 tools/perf/util/arm-spe.c                          |  321 +++-
 tools/perf/util/arm-spe.h                          |   38 +-
 tools/perf/util/auxtrace.h                         |    3 +-
 tools/perf/util/bpf-filter.c                       |    2 +-
 tools/perf/util/bpf-prologue.h                     |   37 -
 tools/perf/util/bpf_counter.c                      |   35 +-
 tools/perf/util/bpf_skel/bperf_follower.bpf.c      |   98 +-
 tools/perf/util/bpf_skel/bperf_u.h                 |    5 +
 tools/perf/util/color.c                            |   28 -
 tools/perf/util/color.h                            |   11 +-
 tools/perf/util/config.c                           |   22 +
 tools/perf/util/config.h                           |    1 +
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c    |    7 +-
 tools/perf/util/cs-etm.c                           |   25 +-
 tools/perf/util/data-convert-bt.c                  |    2 +-
 tools/perf/util/data-convert-json.c                |    2 +-
 tools/perf/util/debug.c                            |    2 +-
 tools/perf/util/debuginfo.h                        |    6 +-
 tools/perf/util/disasm.c                           |  298 ++--
 tools/perf/util/disasm.h                           |    8 +-
 tools/perf/util/dwarf-aux.c                        |    6 -
 tools/perf/util/dwarf-aux.h                        |   54 -
 .../util/dwarf-regs.c => util/dwarf-regs-csky.c}   |   19 +-
 tools/perf/util/dwarf-regs-powerpc.c               |   61 +
 tools/perf/util/dwarf-regs-x86.c                   |   50 +
 tools/perf/util/dwarf-regs.c                       |   38 +-
 tools/perf/util/env.c                              |   27 +-
 tools/perf/util/env.h                              |    4 +
 tools/perf/util/event.h                            |    1 +
 tools/perf/util/evlist.c                           |   83 +-
 tools/perf/util/evlist.h                           |   15 +-
 tools/perf/util/evsel.c                            |  886 ++++++-----
 tools/perf/util/evsel.h                            |   52 +-
 tools/perf/util/evsel_fprintf.c                    |    2 +-
 tools/perf/util/expr.c                             |   97 +-
 tools/perf/util/genelf.c                           |    4 +-
 tools/perf/util/genelf.h                           |    2 +-
 tools/perf/util/hashmap.h                          |   20 +-
 tools/perf/util/header.c                           |   84 +-
 tools/perf/util/header.h                           |   23 +-
 tools/perf/util/hist.c                             |    3 +
 tools/perf/util/hist.h                             |    3 +
 tools/perf/util/hwmon_pmu.c                        |  832 ++++++++++
 tools/perf/util/hwmon_pmu.h                        |  151 ++
 tools/perf/util/include/dwarf-regs.h               |  124 +-
 tools/perf/util/intel-bts.c                        |    4 +-
 tools/perf/util/intel-pt.c                         |    4 +-
 tools/perf/util/machine.c                          |    2 +-
 tools/perf/util/mem-events.c                       |    8 +-
 tools/perf/util/metricgroup.c                      |   39 +-
 tools/perf/util/parse-events.c                     |  125 +-
 tools/perf/util/parse-events.h                     |   13 +-
 tools/perf/util/parse-events.l                     |   11 -
 tools/perf/util/parse-events.y                     |   18 +-
 tools/perf/util/pfm.c                              |    4 +-
 tools/perf/util/pmu.c                              |  137 +-
 tools/perf/util/pmu.h                              |   18 +-
 tools/perf/util/pmus.c                             |   18 +-
 tools/perf/util/pmus.h                             |    3 +
 tools/perf/util/print-events.c                     |   36 +-
 tools/perf/util/print-events.h                     |    1 -
 tools/perf/util/probe-event.c                      |  182 ++-
 tools/perf/util/probe-event.h                      |    3 -
 tools/perf/util/probe-file.c                       |   19 -
 tools/perf/util/probe-file.h                       |    1 -
 tools/perf/util/probe-finder.c                     |   42 +-
 tools/perf/util/probe-finder.h                     |   13 +-
 tools/perf/util/python.c                           |    2 +-
 tools/perf/util/s390-cpumsf.c                      |    2 +-
 tools/perf/util/s390-sample-raw.c                  |    8 +-
 .../perf/util/scripting-engines/trace-event-perl.c |    2 +-
 .../util/scripting-engines/trace-event-python.c    |   11 +-
 tools/perf/util/session.c                          |   28 +-
 tools/perf/util/sort.c                             |  115 +-
 tools/perf/util/sort.h                             |    3 +
 tools/perf/util/stat-display.c                     |  196 ++-
 tools/perf/util/stat-shadow.c                      |  166 +-
 tools/perf/util/stat.c                             |    2 +-
 tools/perf/util/stat.h                             |   16 +-
 tools/perf/util/string.c                           |  100 ++
 tools/perf/util/string2.h                          |    2 +
 tools/perf/util/symbol.c                           |    2 +-
 tools/perf/util/syscalltbl.c                       |    4 +
 tools/perf/util/target.h                           |    1 +
 tools/perf/util/threads.c                          |    4 +-
 tools/perf/util/tool_pmu.c                         |  505 ++++++
 tools/perf/util/tool_pmu.h                         |   56 +
 tools/perf/util/trace-event-parse.c                |    8 +-
 tools/perf/util/trace-event-read.c                 |    2 +-
 tools/perf/util/trace-event-scripting.c            |    2 +-
 tools/perf/util/trace-event.c                      |    2 +-
 tools/perf/util/trace-event.h                      |    5 +-
 tools/perf/util/tsc.c                              |    2 +-
 tools/perf/util/tsc.h                              |    2 +-
 tools/perf/util/util.c                             |   95 +-
 tools/perf/util/util.h                             |   18 +-
 338 files changed, 9483 insertions(+), 4123 deletions(-)
 delete mode 100644 tools/build/feature/test-dwarf.c
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 delete mode 100644 tools/perf/tests/attr.c
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 rename tools/perf/tests/{ => shell}/attr/base-stat (100%)
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 rename tools/perf/tests/{ => shell}/attr/test-record-C0 (95%)
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 create mode 100644 tools/perf/util/tool_pmu.h

Hey Namhyung,

After merging this PR into linus-next, the "Simple expression parser" test has started failing:

--- start ---
test child forked, pid 292
Using CPUID GenuineIntel-6-1A-3
division by zero
syntax error
Failed to find TSC frequency in /proc/cpuinfo
FAILED tests/expr.c:250 #system_tsc_freq > 0
---- end(-1) ----
7: Simple expression parser : FAILED!

Here's a full log of the run: https://qa-reports.linaro.org/lkft/sashal-linus-next/build/v6.11-24716-gab16e9af2ff9/testrun/26045681/suite/perf/test/_7_Simple_expression_parser/log

Thanks,
Sasha

Hello,

Thanks for the report, I'll take a look.

Namhyung

I suspect this is a side effect of the tool PMU refactoring where the expr double values were changed to u64 counter like values:
https://lore.kernel.org/lkml/[email protected]/

The CPU model matches nehalemep:

```
$ python tools/perf/pmu-events/models.py x86  GenuineIntel-6-1A-3
tools/perf/pmu-events/arch/
nehalemep
```

so the tsc frequency should be determined via /proc/cpuinfo looking for "model name ... @ %lfGHz":
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/arch/x86/util/tsc.c?h=perf-tools-next#n44

The logs make the machine look like an emulator (reference to bochs) so I wonder if the cpuinfo is incorrect. Why the switch from double to u64 would show this problem I'm not sure, perhaps a latent bug was exposed in the test as previously NaN would be returned which does interesting things with comparisons. The test is expecting on an Intel x86 it should be able to compute the TSC frequency and assuming the cpuinfo is lacking the "@ ...GHz" then the test could be working as intended.

Thanks,
Ian

Sorry about the delay. But I cannot see the log unfornately.

Oh, it's an Intel machine. Then it should have the #system_tsc_freq.

Right, we may change the test code not to assume TSC frequency is always available on Intel machines.

Thanks,
Namhyung

Hmm. Has the default search path for the vmlinux image changed?

Doing profiling with this, I get

openat(AT_FDCWD, "vmlinux", O_RDONLY) = 5

which is very very wrong for my kernel build - it basically picks up the vmlinux image from the build directory, which has absolutely *nothign* to do with the image that is being run at the moment.

So now I need to point "perf report" at the actual image, which I didn't need to do before.

Linus

Hello,

I don't think so.

Sure, at least it should match the build-id before use.

Ok, I'll try to reproduce it and take a look.

Thanks,
Namhyung

I tried it here and at first I reproduced Linus results, which I found very strange, then I tried to bisect it, and all the previous versions were producing this:

root@number:/home/acme/git/perf-tools# perf -v ; perf report -vv |& grep -A5 "^Looking at the vmlinux_path"
perf version 6.12.gb50ecc5aca4d
Looking at the vmlinux_path (8 entries long)
symsrc__init: build id mismatch for vmlinux.
symsrc__init: cannot get elf header.
overlapping maps:
 ffffffffc034b75c-ffffffffc034b89b 0 bpf_prog_40ddf486530245f5_sd_devices
 ffffffffc0000000-ffffffffff000000 7fffc0004000 vmlinux
root@number:/home/acme/git/perf-tools#

Which is what I got from the perf-tools branch you asked him to pull.

The algorithm in perf is similar to the one in pahole (that stole it from perf):

root@number:/home/acme/git/perf-tools# strace -e openat pahole --running_kernel_vmlinux |& tail -12
openat(AT_FDCWD, "/sys/kernel/notes", O_RDONLY) = 3
openat(AT_FDCWD, "vmlinux", O_RDONLY)   = 3
openat(AT_FDCWD, "/boot/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/boot/vmlinux-6.11.8-200.fc40.x86_64", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/boot/vmlinux-6.11.8-200.fc40.x86_64", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/modules/6.11.8-200.fc40.x86_64/build/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/lib/modules/6.11.8-200.fc40.x86_64/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/boot/vmlinux-6.11.8-200.fc40.x86_64.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/.cache/debuginfod_client/55152ddca5da77ca62deb3dd0db105e82b3711e0/debuginfo", O_RDONLY) = -1 ENOENT (No such file or directory)
pahole: couldn't find a vmlinux that matches the running kernel
HINT: Maybe you're inside a container or missing a debuginfo package?
+++ exited with 1 +++
root@number:/home/acme/git/perf-tools#

The one in perf does very much the same:

root@number:/home/acme/git/perf-tools# perf -v ; strace -e openat -o /tmp/strace.output perf report -vv |& grep -A5 "^Looking at the vmlinux_path" ; grep '"vmlinux"' -B1 -A10 /tmp/strace.output 
perf version 6.12.gb50ecc5aca4d
Looking at the vmlinux_path (8 entries long)
symsrc__init: build id mismatch for vmlinux.
symsrc__init: cannot get elf header.
overlapping maps:
 ffffffffc034b75c-ffffffffc034b89b 0 bpf_prog_40ddf486530245f5_sd_devices
 ffffffffc0000000-ffffffffff000000 7fffc0004000 vmlinux
openat(AT_FDCWD, "/root/.debug/.build-id/55/152ddca5da77ca62deb3dd0db105e82b3711e0/elf", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "vmlinux", O_RDONLY)   = 142
openat(AT_FDCWD, "/boot/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/boot/vmlinux-6.11.8-200.fc40.x86_64", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/boot/vmlinux-6.11.8-200.fc40.x86_64", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/modules/6.11.8-200.fc40.x86_64/build/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/lib/modules/6.11.8-200.fc40.x86_64/vmlinux", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/debug/boot/vmlinux-6.11.8-200.fc40.x86_64.debug", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/root/.debug/.build-id/55/152ddca5da77ca62deb3dd0db105e82b3711e0/kallsyms", O_RDONLY) = 142
openat(AT_FDCWD, "/sys/kernel/notes", O_RDONLY) = 142
openat(AT_FDCWD, "/proc/kcore", O_RDONLY) = 142
openat(AT_FDCWD, "/proc/kallsyms", O_RDONLY) = 142
root@number:/home/acme/git/perf-tools# 
root@number:/home/acme/git/perf-tools# perf buildid-list -h -k

Usage: perf buildid-list [<options>]

-k, --kernel Show current kernel build id

root@number:/home/acme/git/perf-tools# perf buildid-list -k
55152ddca5da77ca62deb3dd0db105e82b3711e0
root@number:/home/acme/git/perf-tools# file vmlinux 
vmlinux: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=e86cad482822bd4b4caabb01e7cd00161fd51a38, with debug_info, not stripped
root@number:/home/acme/git/perf-tools#

And it ends up using /proc/kallsyms

Today I did some bisects, etc, but even with at first reproducing what Linus described, i.e. it used the non-matching vmlinux in the current directory to resolve symbols, I couldn't reproduce it after trying to bisect it :-\

Hope you root cause this, late in this part of the world, going AFK now.

- Arnaldo

I think it's a bug in perf record since v6.12. I found the build-id event in the header area is broken. Can you verify if this works?

Thanks,
Namhyung

---8<---
From 62ebc7de4c306d99f39af847bee4a2aab05b0f93 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <[email protected]>
Date: Tue, 26 Nov 2024 19:13:31 -0800
Subject: [PATCH] perf tools: Fix build-id event recording

The build-id events written at the end of the record session are broken due to unexpected data. The write_buildid() writes the fixed length event first and then variable length filename.

But a recent change made it write more data in the padding area accidentally. So readers of the event see zero-filled data for the
next entry and treat it incorrectly. This resulted in wrong kernel
symbols because the kernel DSO loaded a random vmlinux image in the path as it didn't have a valid build-id.

---
 tools/perf/util/build-id.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 8982f68e7230cd64..e763e8d99a4367d7 100644
@@ -277,7 +277,7 @@ static int write_buildid(const char *name, size_t name_len, struct build_id *bid
 	struct perf_record_header_build_id b;
 	size_t len;
 
-	len = sizeof(b) + name_len + 1;
+	len = name_len + 1;
 	len = PERF_ALIGN(len, sizeof(u64));
 
 	memset(&b, 0, sizeof(b));

@@ -286,7 +286,7 @@ static int write_buildid(const char *name, size_t name_len, struct build_id *bid
 	misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
 	b.pid = pid;
 	b.header.misc = misc;
-	b.header.size = len;
+	b.header.size = sizeof(b) + len;
 
 	err = do_write(fd, &b, sizeof(b));
 	if (err < 0)

2.47.0.338.g60cca15819-goog

I understand it now, first, when I tried to reproduce Linus case I did a 'perf record' with the most recent code, the one failing for Linus, but then when I tried to test it with v6.1, trying to bisect it, perf v6.1 couldn't process the perf.data file generated "in the future", by v6.12-rc6 + perf-tools:

# perf report -v
file uses a more recent and unsupported ABI (8 bytes extra)
incompatible file format (rerun with -v to learn more)
#

So I did another 'perf record' and used that perf.data, that had no problems all the way to v6.12-rc6, it works, the bug was introduced recently making it not able to checking the build-id in the vmlinux file, as there is nothing to compare it with, no build-id in the perf.data file.

root@number:/home/acme/git/perf-tools# perf -v
perf version 6.12.gb50ecc5aca4d
root@number:/home/acme/git/perf-tools# perf record -a sleep 2s
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 2.442 MB perf.data (8953 samples) ]
root@number:/home/acme/git/perf-tools# perf -v ; strace -e openat -o /tmp/strace.output perf report -vv |& grep -A5 "^Looking at the vmlinux_path" ; grep '"vmlinux"' -B1 -A10 /tmp/strace.output 
perf version 6.12.gb50ecc5aca4d
Looking at the vmlinux_path (8 entries long)
Using vmlinux for symbols
<SNIP>
root@number:/home/acme/git/perf-tools#

So I redid the bisection, this time doing a fresh perf record at each step and got to:

⬢ [acme@toolbox linux]$ git bisect bad ae39ba16554eb4a2d97f752847e93aa428438912 is the first bad commit commit ae39ba16554eb4a2d97f752847e93aa428438912 (HEAD)

Author: Ian Rogers <[email protected]>
Date:   Mon Sep 9 13:37:37 2024 -0700

perf inject: Fix build ID injection

Build ID injection wasn't inserting a sample ID and aligning events to 64 bytes rather than 8. No sample ID means events are unordered and two different build_id events for the same path, as happens when a file is replaced, can't be differentiated.

Add in sample ID insertion for the build_id events alongside some refactoring. The refactoring better aligns the function arguments for different use cases, such as synthesizing build_id events without needing to have a dso. The misc bits are explicitly passed as with callchains the maps/dsos may span user and kernel land, so using sample->cpumode isn't good enough.

⬢ [acme@toolbox linux]$ git tag --contains ae39ba16554eb4a2d97f752847e93aa428438912 | grep ^v6. v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
⬢ [acme@toolbox linux]$

Which matches what Namhyung found. A plain revert doesn't work, Namhyung's patch below fixes it for me, with it:

# perf -v ; perf record -a sleep 2s ; perf buildid-list | grep 'vmlinux\|kallsyms' ; perf report -vv |& grep -A2 "^Looking at the vmlinux_path"
perf version 6.12.g25425b03a8d7
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 2.095 MB perf.data (3738 samples) ]
55152ddca5da77ca62deb3dd0db105e82b3711e0 [kernel.kallsyms]
Looking at the vmlinux_path (8 entries long)
symsrc__init: build id mismatch for vmlinux.
symsrc__init: cannot get elf header.
#

It refuses that bogus "vmlinux" in the current directory, and since my machine has no matching vmlinux, it fallbacks to recording the running kernel build id as "[kernel.kallsyms]" and will use it for resolving symbols.

If I install the matching vmlinux using 'dnf debuginfo-install kernel':

# perf -v ; perf record -a sleep 2s ; perf report -vv |& grep -A2 "^Looking at the vmlinux_path"
perf version 6.12.g25425b03a8d7
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 2.116 MB perf.data (4278 samples) ]
Looking at the vmlinux_path (8 entries long)
symsrc__init: build id mismatch for vmlinux.
Using /usr/lib/debug/lib/modules/6.11.8-200.fc40.x86_64/vmlinux for symbols
# file /usr/lib/debug/lib/modules/6.11.8-200.fc40.x86_64/vmlinux
/usr/lib/debug/lib/modules/6.11.8-200.fc40.x86_64/vmlinux: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=55152ddca5da77ca62deb3dd0db105e82b3711e0, with debug_info, not stripped
# perf buildid-list -h -k

Usage: perf buildid-list [<options>]

-k, --kernel Show current kernel build id

root@number:/home/acme/git/perf-tools# perf buildid-list -k
55152ddca5da77ca62deb3dd0db105e82b3711e0
root@number:/home/acme/git/perf-tools#

It will find the right file and use it.

So, for Namhyung's patch below:

Now to write another 'perf test' to cover this...

- Arnaldo

Ahh. And the reason I thought it was new to this release was simply because I was traveling during the 6.12 merge window and didn't do the tools build that I usually do, so I hadn't realized it was actually pre-existing.

Your patch indeed seems to fix it for me. Not hugely urgent (I just installed the fixed perf binaries and clearly nobody else has even hit the issue), so I'll leave this alone until the next perf tools fixes pull and we'll get it fixed then.

Linus

Good to hear it worked. I'll add it to the perf-tools tree.

Thanks,
Namhyung

Apologies, for the breakage. Have my:

and it'd be useful for a Fixes tag for a 6.12 backport.

Thanks,
Ian