kernel/linux.git/tools/perf/builtin-report.c, branch linux-7.1.y

perf header: Refactor pipe mode end marker handling

2026-04-03T02:35:16+00:00

In non-pipe/data mode the header has a 256-bit bitmap representing whether a feature is enabled or not. In pipe mode features are written out in perf_event__synthesize_features as PERF_RECORD_HEADER_FEATURE events with a special zero sized marker for the last feature. If a new feature is added the last feature marker event appears as that feature from old pipe mode perf data. As the event is zero sized it will fail to be processed and generally terminate perf. Add a last_feat variable to the header that in non-pipe/data mode is just HEADER_LAST_FEATURE. In pipe mode compute the last_feat by handling zero sized feature events, assuming they are the marker and updating last_feat accordingly. Potentially a feature event could be zero sized and so still process the feature event, just ignore the error if it fails. As perf_event__process_feature can properly handle pipe mode data, migrate users to it except for report that still wants to group events and stop header printing with the last feature marker. Make perf_event__process_feature non-fatal in the case of a newer feature than this version of perf's HEADER_LAST_FEATURE, which was the behavior all users wanted. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf tools: Add layout support for --symfs option

2026-03-11T06:13:30+00:00

Add support for parsing an optional layout parameter in the --symfs command line option. The format is: --symfs Where layout can be: - 'hierarchy': matches full path (default) - 'flat': only matches base name When debugging symbol files from a copy of the filesystem (e.g., from a container or remote machine), the debug files are often stored in a flat directory structure with only filenames, not the full original paths. In this case, using 'flat' layout allows perf to find debug symbols by matching only the filename rather than the full path. For example, given a binary path like: /build/output/lib/foo.so With 'perf report --symfs /debug/files,flat', perf will look for: /debug/files/foo.so Instead of: /debug/files/build/output/lib/foo.so This is particularly useful when: - Extracting debug files from containers with different directory layouts - Working with build systems that flatten directory structures Signed-off-by: Changbin Du Signed-off-by: Namhyung Kim

perf session: Add e_flags to the e_machine helper

2026-02-03T21:01:27+00:00

Allow e_flags as well as e_machine to be computed using the e_machine helper. This isn't currently used, the argument is always NULL, but it will be used for a new header feature. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Andrew Jones Cc: Anubhav Shelat Cc: Anup Patel Cc: Athira Rajeev Cc: Blake Jones Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Quan Zhou Cc: Shimin Guo Cc: Swapnil Sapkal Cc: Thomas Falcon Cc: Will Deacon Cc: Yunseong Kim Signed-off-by: Arnaldo Carvalho de Melo

perf callchain: Switch callchain_param_setup from an arch to an e_machine

2026-01-27T04:35:47+00:00

Increase use of e_machine by replacing callchain_param_setup's arch argument to be an e_machine typically read from the session. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Shimin Guo Cc: Yujie Liu Signed-off-by: Arnaldo Carvalho de Melo

perf srcline: Add configuration support for the addr2line style

2026-01-13T19:09:14+00:00

Allow the addr2line style to be specified on the `perf report` command line or in the .perfconfig file. Committer testing: The methods: # perf probe -x ~/bin/perf -F *__addr2line cmd__addr2line libbfd__addr2line libdw__addr2line llvm__addr2line # So if we configure one of them, say 'addr2line': # perf config addr2line.style=addr2line # perf config addr2line.style addr2line.style=addr2line # And have probes on all of them: # perf probe -x ~/bin/perf *__addr2line Added new events: probe_perf:cmd__addr2line (on *__addr2line in /home/acme/bin/perf) probe_perf:llvm__addr2line (on *__addr2line in /home/acme/bin/perf) probe_perf:libbfd__addr2line (on *__addr2line in /home/acme/bin/perf) probe_perf:libdw__addr2line (on *__addr2line in /home/acme/bin/perf) You can now use it in all perf tools, such as: perf record -e probe_perf:libdw__addr2line -aR sleep 1 # Only the selected method should be used: # perf stat -e probe_perf:*_addr2line perf report -f --dso perf --stdio -s srcfile,srcline # Total Lost Samples: 0 # # Samples: 4K of event 'cpu/cycles/Pu' # Event count (approx.): 5535180842 # # Overhead Source File Source:Line # ........ ............ ............... # 99.04% inlineloop.c inlineloop.c:21 0.46% inlineloop.c inlineloop.c:20 # # (Tip: For hierarchical output, try: perf report --hierarchy) # Performance counter stats for 'perf report -f --dso perf --stdio -s srcfile,srcline': 44 probe_perf:cmd__addr2line 0 probe_perf:llvm__addr2line 0 probe_perf:libbfd__addr2line 0 probe_perf:libdw__addr2line 0.035915611 seconds time elapsed 0.028008000 seconds user 0.009051000 seconds sys # I checked and that is the case for the other methods. Also when using: # perf config addr2line.style=libdw,llvm Performance counter stats for 'perf report -f --dso perf --stdio -s srcfile,srcline': 0 probe_perf:cmd__addr2line 23 probe_perf:llvm__addr2line 0 probe_perf:libbfd__addr2line 44 probe_perf:libdw__addr2line Reviewed-by: James Clark Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephen Brennan Cc: Tony Jones Signed-off-by: Arnaldo Carvalho de Melo

perf report: Enable data-type profiling with -F option too

2025-12-17T12:30:37+00:00

It checked -s/--sort options only. As the sort keys can be setup using the -F/--fields option as well, it should enable data-type profiling with it too. The following two commands should have the same output. $ perf report -s type $ perf report -F overhead,type But there's another problem on this. I'll handle it in the next commit. Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim Cc: Adrian Hunter Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo

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 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 sort: Use perf_env to set arch sort keys and header

2025-07-25T17:37:58+00:00

Previously arch_support_sort_key and arch_perf_header_entry used a weak symbol to compile as appropriate for x86 and powerpc. A limitation to this is that the handling of a data file could vary in cross-platform development. Change to using the perf_env of the current session to determine the architecture kind and set the sort key and header entries as appropriate. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250724163302.596743-23-irogers@google.com Signed-off-by: Namhyung Kim

perf evlist: Change env variable to session

2025-07-25T17:37:56+00:00

The session holds a perf_env pointer env. In UI code container_of is used to turn the env to a session, but this assumes the session header's env is in use. Rather than a dubious container_of, hold the session in the evlist and derive the env from the session with evsel__env, perf_session__env, etc. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250724163302.596743-11-irogers@google.com Signed-off-by: Namhyung Kim