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eeb399b531
Add a new 'perf record' option '--kcore' which will put a copy of
/proc/kcore, kallsyms and modules into a perf.data directory. Note, that
without the --kcore option, output goes to a file as previously. The
tools' -o and -i options work with either a file name or directory name.
Example:
$ sudo perf record --kcore uname
$ sudo tree perf.data
perf.data
├── kcore_dir
│ ├── kallsyms
│ ├── kcore
│ └── modules
└── data
$ sudo perf script -v
build id event received for vmlinux: 1eaa285996affce2d74d8e66dcea09a80c9941de
build id event received for [vdso]: 8bbaf5dc62a9b644b4d4e4539737e104e4a84541
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 19058 506778.423729: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
perf 19058 506778.423733: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
perf 19058 506778.423734: 7 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
perf 19058 506778.423736: 117 cycles: ffffffffa2caa54a native_write_msr+0xa (vmlinux)
perf 19058 506778.423738: 2092 cycles: ffffffffa2c9b7b0 native_apic_msr_write+0x0 (vmlinux)
perf 19058 506778.423740: 37380 cycles: ffffffffa2f121d0 perf_event_addr_filters_exec+0x0 (vmlinux)
uname 19058 506778.423751: 582673 cycles: ffffffffa303a407 propagate_protected_usage+0x147 (vmlinux)
uname 19058 506778.423892: 2241841 cycles: ffffffffa2cae0c9 unwind_next_frame.part.5+0x79 (vmlinux)
uname 19058 506778.424430: 2457397 cycles: ffffffffa3019232 check_memory_region+0x52 (vmlinux)
Committer testing:
# rm -rf perf.data*
# perf record sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.024 MB perf.data (7 samples) ]
# ls -l perf.data
-rw-------. 1 root root 34772 Oct 21 11:08 perf.data
# perf record --kcore uname
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.024 MB perf.data (7 samples) ]
ls[root@quaco ~]# ls -lad perf.data*
drwx------. 3 root root 4096 Oct 21 11:08 perf.data
-rw-------. 1 root root 34772 Oct 21 11:08 perf.data.old
# perf evlist -v
cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
# perf evlist -v -i perf.data/data
cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
#
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lore.kernel.org/lkml/20191004083121.12182-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
63 lines
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63 lines
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perf.data directory format
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DISCLAIMER This is not ABI yet and is subject to possible change
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in following versions of perf. We will remove this
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disclaimer once the directory format soaks in.
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This document describes the on-disk perf.data directory format.
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The layout is described by HEADER_DIR_FORMAT feature.
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Currently it holds only version number (0):
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HEADER_DIR_FORMAT = 24
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struct {
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uint64_t version;
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}
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The current only version value 0 means that:
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- there is a single perf.data file named 'data' within the directory.
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e.g.
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$ tree -ps perf.data
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perf.data
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└── [-rw------- 25912] data
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Future versions are expected to describe different data files
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layout according to special needs.
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Currently the only 'perf record' option to output to a directory is
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the --kcore option which puts a copy of /proc/kcore into the directory.
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e.g.
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$ sudo perf record --kcore uname
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Linux
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[ perf record: Woken up 1 times to write data ]
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[ perf record: Captured and wrote 0.015 MB perf.data (9 samples) ]
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$ sudo tree -ps perf.data
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perf.data
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├── [-rw------- 23744] data
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└── [drwx------ 4096] kcore_dir
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├── [-r-------- 6731125] kallsyms
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├── [-r-------- 40230912] kcore
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└── [-r-------- 5419] modules
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1 directory, 4 files
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$ sudo perf script -v
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build id event received for vmlinux: 1eaa285996affce2d74d8e66dcea09a80c9941de
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build id event received for [vdso]: 8bbaf5dc62a9b644b4d4e4539737e104e4a84541
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build id event received for /lib/x86_64-linux-gnu/libc-2.28.so: 5b157f49586a3ca84d55837f97ff466767dd3445
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Samples for 'cycles' event do not have CPU attribute set. Skipping 'cpu' field.
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Using CPUID GenuineIntel-6-8E-A
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Using perf.data/kcore_dir/kcore for kernel data
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Using perf.data/kcore_dir/kallsyms for symbols
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perf 15316 2060795.480902: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
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perf 15316 2060795.480906: 1 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
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perf 15316 2060795.480908: 7 cycles: ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
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perf 15316 2060795.480910: 119 cycles: ffffffffa2caa54a native_write_msr+0xa (vmlinux)
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perf 15316 2060795.480912: 2109 cycles: ffffffffa2c9b7b0 native_apic_msr_write+0x0 (vmlinux)
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perf 15316 2060795.480914: 37606 cycles: ffffffffa2f121fe perf_event_addr_filters_exec+0x2e (vmlinux)
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uname 15316 2060795.480924: 588287 cycles: ffffffffa303a56d page_counter_try_charge+0x6d (vmlinux)
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uname 15316 2060795.481067: 2261945 cycles: ffffffffa301438f kmem_cache_free+0x4f (vmlinux)
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uname 15316 2060795.481643: 2172167 cycles: 7f1a48c393c0 _IO_un_link+0x0 (/lib/x86_64-linux-gnu/libc-2.28.so)
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