Hello, This is a new version of deferred callchain support as the kernel part is merged to the tip tree. Actually this is based on Steve's work (v16).
https://lore.kernel.org/r/[email protected] This version has the following changes. * handle new attr.defer_output to generate deferred callchains * fix crash when cookies don't match (Steven) * disable merging for perf inject * fix missing feature detection bug * symbolize merged callchains properly Here's an example session. $ perf record -g pwd /home/namhyung/project/linux [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.010 MB perf.data (29 samples) ] $ perf evlist -v cpu/cycles/P: type: 0 (PERF_TYPE_HARDWARE), size: 136, config: 0 (PERF_COUNT_HW_CPU_CYCLES), { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|CALLCHAIN|PERIOD, read_format: ID|LOST, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1, build_id: 1, defer_callchain: 1, defer_output: 1 $ 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) ... $ perf script --no-merge-callchains ... 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 [unknown] ([unknown]) pwd 2312 121.163447: DEFERRED CALLCHAIN 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 code is available at 'perf/defer-callchain-v3' branch in git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git Thanks, Namhyung Namhyung Kim (5): tools headers UAPI: Sync linux/perf_event.h for deferred callchains perf tools: Minimal DEFERRED_CALLCHAIN support perf record: Enable defer_callchain for user callchains perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED perf tools: Merge deferred user callchains tools/include/uapi/linux/perf_event.h | 21 +++++- tools/lib/perf/include/perf/event.h | 8 ++ tools/perf/Documentation/perf-script.txt | 5 ++ tools/perf/builtin-inject.c | 1 + tools/perf/builtin-report.c | 1 + tools/perf/builtin-script.c | 92 +++++++++++++++++++++++ tools/perf/util/callchain.c | 29 +++++++ tools/perf/util/callchain.h | 3 + tools/perf/util/event.c | 1 + tools/perf/util/evlist.c | 1 + tools/perf/util/evlist.h | 2 + tools/perf/util/evsel.c | 43 +++++++++++ tools/perf/util/evsel.h | 1 + tools/perf/util/machine.c | 1 + tools/perf/util/perf_event_attr_fprintf.c | 2 + tools/perf/util/sample.h | 2 + tools/perf/util/session.c | 85 +++++++++++++++++++++ tools/perf/util/tool.c | 2 + tools/perf/util/tool.h | 4 +- 19 files changed, 302 insertions(+), 2 deletions(-) -- 2.52.0.rc1.455.g30608eb744-goog
