kernel/linux.git/tools/perf/builtin-script.c, branch v6.19.11

perf tools: Merge deferred user callchains

2025-12-03T05:59:14+00:00

Save samples with deferred callchains in a separate list and deliver them after merging the user callchains. If users don't want to merge they can set tool->merge_deferred_callchains to false to prevent the behavior. With previous result, now perf script will show the merged callchains. $ perf script ... pwd 2312 121.163435: 249113 cpu/cycles/P: ffffffff845b78d8 __build_id_parse.isra.0+0x218 ([kernel.kallsyms]) ffffffff83bb5bf6 perf_event_mmap+0x2e6 ([kernel.kallsyms]) ffffffff83c31959 mprotect_fixup+0x1e9 ([kernel.kallsyms]) ffffffff83c31dc5 do_mprotect_pkey+0x2b5 ([kernel.kallsyms]) ffffffff83c3206f __x64_sys_mprotect+0x1f ([kernel.kallsyms]) ffffffff845e6692 do_syscall_64+0x62 ([kernel.kallsyms]) ffffffff8360012f entry_SYSCALL_64_after_hwframe+0x76 ([kernel.kallsyms]) 7f18fe337fa7 mprotect+0x7 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) 7f18fe330e0f _dl_sysdep_start+0x7f (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) 7f18fe331448 _dl_start_user+0x0 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) ... The old output can be get using --no-merge-callchain option. Also perf report can get the user callchain entry at the end. $ perf report --no-children --stdio -q -S __build_id_parse.isra.0 # symbol: __build_id_parse.isra.0 8.40% pwd [kernel.kallsyms] | ---__build_id_parse.isra.0 perf_event_mmap mprotect_fixup do_mprotect_pkey __x64_sys_mprotect do_syscall_64 entry_SYSCALL_64_after_hwframe mprotect _dl_sysdep_start _dl_start_user Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim

perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED

2025-12-03T05:59:14+00:00

Handle the deferred callchains in the script output. $ perf script ... pwd 2312 121.163435: 249113 cpu/cycles/P: ffffffff845b78d8 __build_id_parse.isra.0+0x218 ([kernel.kallsyms]) ffffffff83bb5bf6 perf_event_mmap+0x2e6 ([kernel.kallsyms]) ffffffff83c31959 mprotect_fixup+0x1e9 ([kernel.kallsyms]) ffffffff83c31dc5 do_mprotect_pkey+0x2b5 ([kernel.kallsyms]) ffffffff83c3206f __x64_sys_mprotect+0x1f ([kernel.kallsyms]) ffffffff845e6692 do_syscall_64+0x62 ([kernel.kallsyms]) ffffffff8360012f entry_SYSCALL_64_after_hwframe+0x76 ([kernel.kallsyms]) b00000006 (cookie) ([unknown]) pwd 2312 121.163447: DEFERRED CALLCHAIN [cookie: b00000006] 7f18fe337fa7 mprotect+0x7 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) 7f18fe330e0f _dl_sysdep_start+0x7f (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) 7f18fe331448 _dl_start_user+0x0 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim

perf script: Fix build by removing unused evsel_script()

2025-11-15T17:44:04+00:00

The evsel_script() function is unused since the linked commit. Fix the build by removing it. Fixes the following compilation error: static inline struct evsel_script *evsel_script(struct evsel *evsel) ^ builtin-script.c:347:36: error: unused function 'evsel_script' [-Werror,-Wunused-function] Fixes: 3622990efaab ("perf script: Change metric format to use json metrics") Signed-off-by: James Clark Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim

perf build: Remove NO_AUXTRACE build option

2025-11-14T07:03:11+00:00

The NO_AUXTRACE build option was used when the __get_cpuid feature test failed or if it was provided on the command line. The option no longer avoids a dependency on a library and so having the option is just adding complexity to the code base. Remove the option CONFIG_AUXTRACE from Build files and HAVE_AUXTRACE_SUPPORT by assuming it is always defined. Signed-off-by: Ian Rogers Reviewed-by: James Clark Signed-off-by: Namhyung Kim

perf stat: Remove hard coded shadow metrics

2025-11-12T00:48:35+00:00

Now that the metrics are encoded in common json the hard coded printing means the metrics are shown twice. Remove the hard coded version. This means that when specifying events, and those events correspond to a hard coded metric, the metric will no longer be displayed. The metric will be displayed if the metric is requested. Due to the adhoc printing in the previous approach it was often found frustrating, the new approach avoids this. The default perf stat output on an alderlake now looks like: ``` $ perf stat -a -- sleep 1 Performance counter stats for 'system wide': 19,697 context-switches # nan cs/sec cs_per_second TopdownL1 (cpu_core) # 10.7 % tma_bad_speculation # 24.9 % tma_frontend_bound TopdownL1 (cpu_core) # 34.3 % tma_backend_bound # 30.1 % tma_retiring 6,593 page-faults # nan faults/sec page_faults_per_second 729,065,658 cpu_atom/cpu-cycles/ # nan GHz cycles_frequency (49.79%) 1,605,131,101 cpu_core/cpu-cycles/ # nan GHz cycles_frequency # 19.7 % tma_bad_speculation # 14.2 % tma_retiring (50.14%) # 37.3 % tma_frontend_bound (50.31%) 87,302,268 cpu_atom/branches/ # nan M/sec branch_frequency (60.27%) 512,046,956 cpu_core/branches/ # nan M/sec branch_frequency 1,111 cpu-migrations # nan migrations/sec migrations_per_second # 28.8 % tma_backend_bound (60.26%) 0.00 msec cpu-clock # 0.0 CPUs CPUs_utilized 392,509,323 cpu_atom/instructions/ # 0.6 instructions insn_per_cycle (60.19%) 2,990,369,310 cpu_core/instructions/ # 1.9 instructions insn_per_cycle 3,493,478 cpu_atom/branch-misses/ # 5.9 % branch_miss_rate (49.69%) 7,297,531 cpu_core/branch-misses/ # 1.4 % branch_miss_rate 1.006621701 seconds time elapsed ``` Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf script: Change metric format to use json metrics

2025-11-12T00:48:35+00:00

The metric format option isn't properly supported. This change improves that by making the sample events update the counts of an evsel, where the shadow metric code expects to read the values. To support printing metrics, metrics need to be found. This is done on the first attempt to print a metric. Every metric is parsed and then the evsels in the metric's evlist compared to those in perf script using the perf_event_attr type and config. If the metric matches then it is added for printing. As an event in the perf script's evlist may have >1 metric id, or different leader for aggregation, the first metric matched will be displayed in those cases. An example use is: ``` $ perf record -a -e '{instructions,cpu-cycles}:S' -a -- sleep 1 $ perf script -F period,metric ... 867817 metric: 0.30 insn per cycle 125394 metric: 0.04 insn per cycle 313516 metric: 0.11 insn per cycle metric: 1.00 insn per cycle ``` Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf tool: Add the perf_tool argument to all callbacks

2025-11-07T21:25:05+00:00

Getting context for what a tool is doing, such as the perf_inject instance, using container_of the tool is a common pattern in the code. This isn't possible event_op2, event_op3 and event_op4 callbacks as the tool isn't passed. Add the argument and then fix function signatures to match. As tools maybe reading a tool from somewhere else, change that code to use the passed in tool. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf capstone: Move capstone functionality into its own file

2025-10-02T18:36:59+00:00

Capstone disassembly support was split between disasm.c and print_insn.c. Move support out of these files into capstone.[ch] and remove include capstone/capstone.h from those files. As disassembly routines can fail, make failure the only option without HAVE_LIBCAPSTONE_SUPPORT. For simplicity's sake, duplicate the read_symbol utility function. The intent with moving capstone support into a single file is that dynamic support, using dlopen for libcapstone, can be added in later patches. This can potentially always succeed or fail, so relying on ifdefs isn't sufficient. Using dlopen is a useful option to minimize the perf tools dependencies and potentially size. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Bill Wendling Cc: Charlie Jenkins Cc: Collin Funk Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Eric Biggers Cc: Haibo Xu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Justin Stitt Cc: Li Huafei Cc: Mark Rutland Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Peter Zijlstra Cc: Song Liu Cc: Stephen Brennan Signed-off-by: Arnaldo Carvalho de Melo

perf script: Enable to present DTL entries

2025-10-01T14:22:05+00:00

The process_event() function in "builtin-script.c" invokes perf_sample__fprintf_synth() for displaying PERF_TYPE_SYNTH type events. if (attr->type == PERF_TYPE_SYNTH && PRINT_FIELD(SYNTH)) perf_sample__fprintf_synth(sample, evsel, fp); perf_sample__fprintf_synth() process the sample depending on the value in evsel->core.attr.config. Introduce perf_sample__fprintf_synth_vpadtl() and invoke this for PERF_SYNTH_POWERPC_VPA_DTL Sample output: ./perf record -a -e sched:*,vpa_dtl/dtl_all/ -c 1000000000 sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.300 MB perf.data ] ./perf script perf 13322 [002] 233.835807: sched:sched_switch: perf:13322 [120] R ==> migration/2:27 [0] migration/2 27 [002] 233.835811: sched:sched_migrate_task: comm=perf pid=13322 prio=120 orig_cpu=2 dest_cpu=3 migration/2 27 [002] 233.835818: sched:sched_stat_runtime: comm=migration/2 pid=27 runtime=9214 [ns] migration/2 27 [002] 233.835819: sched:sched_switch: migration/2:27 [0] S ==> swapper/2:0 [120] swapper 0 [002] 233.835822: vpa-dtl: timebase: 338954486062657 dispatch_reason:decrementer_interrupt, preempt_reason:H_CEDE, enqueue_to_dispatch_time:435, ready_to_enqueue_time:0, waiting_to_ready_time:34775058, processor_id: 202 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms]) swapper 0 [001] 233.835886: vpa-dtl: timebase: 338954486095398 dispatch_reason:priv_doorbell, preempt_reason:H_CEDE, enqueue_to_dispatch_time:542, ready_to_enqueue_time:0, waiting_to_ready_time:1245360, processor_id: 201 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms]) Reviewed-by: Adrian Hunter Signed-off-by: Athira Rajeev Tested-by: Tejas Manhas Tested-by: Venkat Rao Bagalkote Cc: Aboorva Devarajan Cc: Aditya Bodkhe Cc: Hari Bathini Cc: Ian Rogers Cc: Jiri Olsa Cc: Madhavan Srinivasan Cc: Namhyung Kim Cc: Shrikanth Hegde Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Fix duplicated words in documentation and comments

2025-10-01T12:44:02+00:00

- "the the" - "in in" - "a a" Reviewed-by: Ian Rogers Signed-off-by: Markus Heidelberg Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo