diff options
Diffstat (limited to 'tools/perf/Documentation/perf.data-directory-format.txt')
| -rw-r--r-- | tools/perf/Documentation/perf.data-directory-format.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf.data-directory-format.txt b/tools/perf/Documentation/perf.data-directory-format.txt index 4bf08908178d..f37fbd29112e 100644 --- a/tools/perf/Documentation/perf.data-directory-format.txt +++ b/tools/perf/Documentation/perf.data-directory-format.txt @@ -26,3 +26,38 @@ The current only version value 0 means that: Future versions are expected to describe different data files layout according to special needs. + +Currently the only 'perf record' option to output to a directory is +the --kcore option which puts a copy of /proc/kcore into the directory. +e.g. + + $ sudo perf record --kcore uname + Linux + [ perf record: Woken up 1 times to write data ] + [ perf record: Captured and wrote 0.015 MB perf.data (9 samples) ] + $ sudo tree -ps perf.data + perf.data + ├── [-rw------- 23744] data + └── [drwx------ 4096] kcore_dir + ├── [-r-------- 6731125] kallsyms + ├── [-r-------- 40230912] kcore + └── [-r-------- 5419] modules + + 1 directory, 4 files + $ sudo perf script -v + build id event received for vmlinux: 1eaa285996affce2d74d8e66dcea09a80c9941de + build id event received for [vdso]: 8bbaf5dc62a9b644b4d4e4539737e104e4a84541 + build id event received for /lib/x86_64-linux-gnu/libc-2.28.so: 5b157f49586a3ca84d55837f97ff466767dd3445 + Samples for 'cycles' event do not have CPU attribute set. Skipping 'cpu' field. + Using CPUID GenuineIntel-6-8E-A + Using perf.data/kcore_dir/kcore for kernel data + Using perf.data/kcore_dir/kallsyms for symbols + perf 15316 2060795.480902: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux) + perf 15316 2060795.480906: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux) + perf 15316 2060795.480908: 7 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux) + perf 15316 2060795.480910: 119 cycles: ffffffffa2caa54a native_write_msr+0xa (vmlinux) + perf 15316 2060795.480912: 2109 cycles: ffffffffa2c9b7b0 native_apic_msr_write+0x0 (vmlinux) + perf 15316 2060795.480914: 37606 cycles: ffffffffa2f121fe perf_event_addr_filters_exec+0x2e (vmlinux) + uname 15316 2060795.480924: 588287 cycles: ffffffffa303a56d page_counter_try_charge+0x6d (vmlinux) + uname 15316 2060795.481067: 2261945 cycles: ffffffffa301438f kmem_cache_free+0x4f (vmlinux) + uname 15316 2060795.481643: 2172167 cycles: 7f1a48c393c0 _IO_un_link+0x0 (/lib/x86_64-linux-gnu/libc-2.28.so) |