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Subject[PATCH v3 0/9] perf: enable compression of record mode trace to save storage space
Date

The patch set implements runtime trace compression (-z option) in
record mode and trace auto decompression in report and inject modes.
Streaming Zstandard (Zstd) API (zstd) is used for compression and
decompression of data that come from kernel mmaped data buffers.

Usage of implemented -z,--compression_level=n option provides ~3-5x
avg. trace file size reduction on variety of tested workloads what
saves storage space on larger server systems where trace file size
can easily reach several tens or even hundreds of GiBs, especially
when profiling with dwarf-based stacks and tracing of context switches.
Implemented -f,--mmap-flush option can be used to avoid compressing
every single byte of data and increase compression ratio at the same
time lowering tool runtime overhead. Default option value is 1 what
is equal to the current perf record implementation. The option is
independent from -z setting and doesn't vary with compression level:

$ tools/perf/perf record -z 1 -e cycles -- matrix.gcc
$ tools/perf/perf record --aio=1 -z 1 -e cycles -- matrix.gcc
$ tools/perf/perf record -z 1 -f 1024 -e cycles -- matrix.gcc
$ tools/perf/perf record --aio=1 -z 1 -f 1024 -e cycles -- matrix.gcc

Runtime compression overhead has been measured for serial and AIO
trace writing modes when profiling matrix multiplication workload
with the following results:

-------------------------------------------------------------
| SERIAL | AIO-1 |
-----------------------------------------------------------------
|-z | OVH(x) | ratio(x) size(MiB) | OVH(x) | ratio(x) size(MiB) |
|----------------------------------------------------------------
| 0 | 1,00 | 1,000 179,424 | 1,00 | 1,000 187,527 |
| 1 | 1,04 | 8,427 181,148 | 1,01 | 8,474 188,562 |
| 2 | 1,07 | 8,055 186,953 | 1,03 | 7,912 191,773 |
| 3 | 1,04 | 8,283 181,908 | 1,03 | 8,220 191,078 |
| 5 | 1,09 | 8,101 187,705 | 1,05 | 7,780 190,065 |
| 8 | 1,05 | 9,217 179,191 | 1,12 | 6,111 193,024 |
-----------------------------------------------------------------

OVH = (Execution time with -z N) / (Execution time with -z 0)

ratio - compression ratio
size - number of bytes that was compressed

size ~= trace file x ratio

See complete description of measurement conditions and details below.

Introduced compression functionality can be disabled or configured from
the command line using NO_LIBZSTD and LIBZSTD_DIR defines:

$ make -C tools/perf NO_LIBZSTD=1 clean all
$ make -C tools/perf LIBZSTD_DIR=/path/to/zstd/sources/ clean all

If your system has some version of the zstd package preinstalled then
the build system finds and uses it during the build. Auto detection
feature status is reported just before compilation starts, as usual.
If you still prefer to compile with some version of zstd that is not
preinstalled you have capability to refer the compilation to that
version using LIBZSTD_DIR define.

See 'tools/perf/perf test' run results below.

---
Alexey Budankov (9):
feature: implement libzstd check, LIBZSTD_DIR and NO_LIBZSTD defines
perf record: implement -f,--mmap-flush=<threshold> option
perf session: define bytes_transferred and bytes_compressed metrics
perf record: implement COMPRESSED event record and its attributes
perf mmap: implement dedicated memory buffer for data compression
perf util: introduce Zstd based streaming compression API
perf record: implement -z,--compression_level=n option and compression
perf report: implement record trace decompression
perf inject: enable COMPRESSED records decompression

tools/build/Makefile.feature | 6 +-
tools/build/feature/Makefile | 6 +-
tools/build/feature/test-all.c | 5 +
tools/build/feature/test-libzstd.c | 12 ++
tools/perf/Documentation/perf-record.txt | 10 ++
tools/perf/Makefile.config | 20 +++
tools/perf/Makefile.perf | 3 +
tools/perf/builtin-inject.c | 4 +
tools/perf/builtin-record.c | 161 ++++++++++++++++++++---
tools/perf/builtin-report.c | 5 +-
tools/perf/perf.h | 2 +
tools/perf/util/Build | 2 +
tools/perf/util/compress.h | 22 ++++
tools/perf/util/env.h | 11 ++
tools/perf/util/event.c | 1 +
tools/perf/util/event.h | 7 +
tools/perf/util/evlist.c | 8 +-
tools/perf/util/evlist.h | 3 +-
tools/perf/util/header.c | 55 +++++++-
tools/perf/util/header.h | 1 +
tools/perf/util/mmap.c | 60 +++++++--
tools/perf/util/mmap.h | 18 ++-
tools/perf/util/session.c | 124 ++++++++++++++++-
tools/perf/util/session.h | 14 ++
tools/perf/util/tool.h | 2 +
tools/perf/util/zstd.c | 143 ++++++++++++++++++++
26 files changed, 659 insertions(+), 46 deletions(-)
create mode 100644 tools/build/feature/test-libzstd.c
create mode 100644 tools/perf/util/zstd.c

---
Changes in v3:
- moved -f,--mmap-flush option implementation into a separate patch
- moved definition and printing of bytes_transferred and bytes_compressed into a separate patch
- moved COMPRESSED feature into a separate patch
- added versioning and stored COMPRESSED feature attributes as u32
- implemented dedicated memory buffer for compression in case of serial streaming
- moved low level Zstd based compression functions into util/{compress.h,zstd.c}
- made compress function to be a param of __push(), __aio_push() functions
- enabled perf inject to decompress COMPRESSED records
- measured compression overhead for serial and AIO streaming using
basic matrix multiplication workload on 8 core skylake

Changes in v2:
- moved compression/decompression code to session layer
- enabled allocation aio data buffers for compression
- enabled trace compression for serial trace streaming

---
[1] https://github.com/facebook/zstd

---
OVERHEAD MEASUREMENTS:

uname -a
Linux localhost 4.20.7-200.fc29.x86_64 #1 SMP Wed Feb 6 19:16:42 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

cat /proc/cpuinfo
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 94
model name : Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
stepping : 3
microcode : 0xc6
cpu MHz : 4021.884
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 3
cpu cores : 4
apicid : 7
initial apicid : 7
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp flush_l1d
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips : 8016.00
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:

-----------------------------------------------------------------
#!/bin/bash -xv

echo 0 > /proc/sys/kernel/perf_event_paranoid
+ echo 0
cat /proc/sys/kernel/perf_event_paranoid
+ cat /proc/sys/kernel/perf_event_paranoid
0

echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
+ echo performance
+ tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
performance

for i in 0 1 2 3 5 8
do
/usr/bin/time tools/perf/perf record -z $i -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
done
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 0 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7fe36de5c010
Offs of buf1 = 0x7fe36de5c180
Addr of buf2 = 0x7fe36be5b010
Offs of buf2 = 0x7fe36be5b1c0
Addr of buf3 = 0x7fe369e5a010
Offs of buf3 = 0x7fe369e5a100
Addr of buf4 = 0x7fe367e59010
Offs of buf4 = 0x7fe367e59140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 16.949 seconds
[ perf record: Woken up 309 times to write data ]
[ perf record: Captured and wrote 179.424 MB perf.data ]
133.67user 0.35system 0:17.08elapsed 784%CPU (0avgtext+0avgdata 100580maxresident)k
0inputs+367480outputs (0major+34737minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 1 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7fcaec334010
Offs of buf1 = 0x7fcaec334180
Addr of buf2 = 0x7fcaea333010
Offs of buf2 = 0x7fcaea3331c0
Addr of buf3 = 0x7fcae8332010
Offs of buf3 = 0x7fcae8332100
Addr of buf4 = 0x7fcae6331010
Offs of buf4 = 0x7fcae6331140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 17.608 seconds
[ perf record: Woken up 595 times to write data ]
[ perf record: Compressed 181.148 MB to 21.497 MB, ratio is 8.427 ]
[ perf record: Captured and wrote 21.527 MB perf.data ]
135.69user 0.24system 0:17.73elapsed 766%CPU (0avgtext+0avgdata 100500maxresident)k
0inputs+44112outputs (0major+35033minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 2 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f1336f8d010
Offs of buf1 = 0x7f1336f8d180
Addr of buf2 = 0x7f1334f8c010
Offs of buf2 = 0x7f1334f8c1c0
Addr of buf3 = 0x7f1332f8b010
Offs of buf3 = 0x7f1332f8b100
Addr of buf4 = 0x7f1330f8a010
Offs of buf4 = 0x7f1330f8a140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.175 seconds
[ perf record: Woken up 521 times to write data ]
[ perf record: Compressed 186.953 MB to 23.210 MB, ratio is 8.055 ]
[ perf record: Captured and wrote 23.239 MB perf.data ]
140.21user 0.25system 0:18.32elapsed 766%CPU (0avgtext+0avgdata 100560maxresident)k
0inputs+47608outputs (0major+35263minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 3 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f97060e3010
Offs of buf1 = 0x7f97060e3180
Addr of buf2 = 0x7f97040e2010
Offs of buf2 = 0x7f97040e21c0
Addr of buf3 = 0x7f97020e1010
Offs of buf3 = 0x7f97020e1100
Addr of buf4 = 0x7f97000e0010
Offs of buf4 = 0x7f97000e0140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 17.688 seconds
[ perf record: Woken up 485 times to write data ]
[ perf record: Compressed 181.908 MB to 21.962 MB, ratio is 8.283 ]
[ perf record: Captured and wrote 21.991 MB perf.data ]
136.87user 0.23system 0:17.81elapsed 769%CPU (0avgtext+0avgdata 100616maxresident)k
0inputs+45064outputs (0major+35773minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 5 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f477b444010
Offs of buf1 = 0x7f477b444180
Addr of buf2 = 0x7f4779443010
Offs of buf2 = 0x7f47794431c0
Addr of buf3 = 0x7f4777442010
Offs of buf3 = 0x7f4777442100
Addr of buf4 = 0x7f4775441010
Offs of buf4 = 0x7f4775441140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.406 seconds
[ perf record: Woken up 416 times to write data ]
[ perf record: Compressed 187.705 MB to 23.170 MB, ratio is 8.101 ]
[ perf record: Captured and wrote 23.200 MB perf.data ]
142.72user 0.26system 0:18.53elapsed 771%CPU (0avgtext+0avgdata 100520maxresident)k
0inputs+47528outputs (0major+36928minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record -z 8 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7fb5bf032010
Offs of buf1 = 0x7fb5bf032180
Addr of buf2 = 0x7fb5bd031010
Offs of buf2 = 0x7fb5bd0311c0
Addr of buf3 = 0x7fb5bb030010
Offs of buf3 = 0x7fb5bb030100
Addr of buf4 = 0x7fb5b902f010
Offs of buf4 = 0x7fb5b902f140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 17.751 seconds
[ perf record: Woken up 391 times to write data ]
[ perf record: Compressed 179.191 MB to 19.441 MB, ratio is 9.217 ]
[ perf record: Captured and wrote 19.502 MB perf.data ]
138.90user 0.29system 0:17.88elapsed 778%CPU (0avgtext+0avgdata 100612maxresident)k
0inputs+39968outputs (0major+37436minor)pagefaults 0swaps

for i in 0 1 2 3 5 8
do
/usr/bin/time tools/perf/perf record --aio=1 -z $i -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
done
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 0 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7feee4519010
Offs of buf1 = 0x7feee4519180
Addr of buf2 = 0x7feee2518010
Offs of buf2 = 0x7feee25181c0
Addr of buf3 = 0x7feee0517010
Offs of buf3 = 0x7feee0517100
Addr of buf4 = 0x7feede516010
Offs of buf4 = 0x7feede516140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 17.912 seconds
[ perf record: Woken up 390 times to write data ]
[ perf record: Captured and wrote 187.527 MB perf.data ]
139.70user 0.39system 0:18.04elapsed 776%CPU (0avgtext+0avgdata 100624maxresident)k
0inputs+384072outputs (0major+35257minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 1 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f72b93ac010
Offs of buf1 = 0x7f72b93ac180
Addr of buf2 = 0x7f72b73ab010
Offs of buf2 = 0x7f72b73ab1c0
Addr of buf3 = 0x7f72b53aa010
Offs of buf3 = 0x7f72b53aa100
Addr of buf4 = 0x7f72b33a9010
Offs of buf4 = 0x7f72b33a9140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.198 seconds
[ perf record: Woken up 416 times to write data ]
[ perf record: Compressed 188.562 MB to 22.252 MB, ratio is 8.474 ]
[ perf record: Captured and wrote 22.284 MB perf.data ]
141.12user 0.32system 0:18.32elapsed 771%CPU (0avgtext+0avgdata 100576maxresident)k
0inputs+45664outputs (0major+35040minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 2 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7ffb9caf3010
Offs of buf1 = 0x7ffb9caf3180
Addr of buf2 = 0x7ffb9aaf2010
Offs of buf2 = 0x7ffb9aaf21c0
Addr of buf3 = 0x7ffb98af1010
Offs of buf3 = 0x7ffb98af1100
Addr of buf4 = 0x7ffb96af0010
Offs of buf4 = 0x7ffb96af0140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.360 seconds
[ perf record: Woken up 442 times to write data ]
[ perf record: Compressed 191.773 MB to 24.238 MB, ratio is 7.912 ]
[ perf record: Captured and wrote 24.290 MB perf.data ]
143.76user 0.49system 0:18.50elapsed 779%CPU (0avgtext+0avgdata 100596maxresident)k
0inputs+49760outputs (0major+35276minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 3 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f13f2df2010
Offs of buf1 = 0x7f13f2df2180
Addr of buf2 = 0x7f13f0df1010
Offs of buf2 = 0x7f13f0df11c0
Addr of buf3 = 0x7f13eedf0010
Offs of buf3 = 0x7f13eedf0100
Addr of buf4 = 0x7f13ecdef010
Offs of buf4 = 0x7f13ecdef140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.383 seconds
[ perf record: Woken up 499 times to write data ]
[ perf record: Compressed 191.078 MB to 23.246 MB, ratio is 8.220 ]
[ perf record: Captured and wrote 23.282 MB perf.data ]
143.72user 0.34system 0:18.51elapsed 778%CPU (0avgtext+0avgdata 100616maxresident)k
0inputs+47704outputs (0major+35783minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 5 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7fca0d091010
Offs of buf1 = 0x7fca0d091180
Addr of buf2 = 0x7fca0b090010
Offs of buf2 = 0x7fca0b0901c0
Addr of buf3 = 0x7fca0908f010
Offs of buf3 = 0x7fca0908f100
Addr of buf4 = 0x7fca0708e010
Offs of buf4 = 0x7fca0708e140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 18.758 seconds
[ perf record: Woken up 535 times to write data ]
[ perf record: Compressed 190.065 MB to 24.430 MB, ratio is 7.780 ]
[ perf record: Captured and wrote 24.519 MB perf.data ]
144.62user 0.66system 0:18.88elapsed 769%CPU (0avgtext+0avgdata 100528maxresident)k
0inputs+50232outputs (0major+36942minor)pagefaults 0swaps
+ for i in 0 1 2 3 5 8
+ /usr/bin/time tools/perf/perf record --aio=1 -z 8 -F 25000 -N -B -T -R -e cycles -- ../../matrix/linux/matrix.gcc
Addr of buf1 = 0x7f7e1f449010
Offs of buf1 = 0x7f7e1f449180
Addr of buf2 = 0x7f7e1d448010
Offs of buf2 = 0x7f7e1d4481c0
Addr of buf3 = 0x7f7e1b447010
Offs of buf3 = 0x7f7e1b447100
Addr of buf4 = 0x7f7e19446010
Offs of buf4 = 0x7f7e19446140
Threads #: 8 Pthreads
Matrix size: 2048
Using multiply kernel: multiply1
Execution time = 20.103 seconds
[ perf record: Woken up 260 times to write data ]
[ perf record: Compressed 193.024 MB to 31.588 MB, ratio is 6.111 ]
[ perf record: Captured and wrote 32.139 MB perf.data ]
151.73user 4.21system 0:20.23elapsed 770%CPU (0avgtext+0avgdata 100616maxresident)k
0inputs+65848outputs (0major+37431minor)pagefaults 0swaps

---
TESTING:

tools/perf/perf test
1: vmlinux symtab matches kallsyms : Skip
2: Detect openat syscall event : Ok
3: Detect openat syscall event on all cpus : Ok
4: Read samples using the mmap interface : Ok
5: Test data source output : Ok
6: Parse event definition strings : Ok
7: Simple expression parser : Ok
8: PERF_RECORD_* events & perf_sample fields : Ok
9: Parse perf pmu format : Ok
10: DSO data read : Ok
11: DSO data cache : Ok
12: DSO data reopen : Ok
13: Roundtrip evsel->name : Ok
14: Parse sched tracepoints fields : Ok
15: syscalls:sys_enter_openat event fields : Ok
16: Setup struct perf_event_attr : Skip
17: Match and link multiple hists : Ok
18: 'import perf' in python : FAILED!
19: Breakpoint overflow signal handler : Ok
20: Breakpoint overflow sampling : Ok
21: Breakpoint accounting : Ok
22: Watchpoint :
22.1: Read Only Watchpoint : Skip
22.2: Write Only Watchpoint : Ok
22.3: Read / Write Watchpoint : Ok
22.4: Modify Watchpoint : Ok
23: Number of exit events of a simple workload : Ok
24: Software clock events period values : Ok
25: Object code reading : Ok
26: Sample parsing : Ok
27: Use a dummy software event to keep tracking : Ok
28: Parse with no sample_id_all bit set : Ok
29: Filter hist entries : Ok
30: Lookup mmap thread : Ok
31: Share thread mg : Ok
32: Sort output of hist entries : Ok
33: Cumulate child hist entries : Ok
34: Track with sched_switch : Ok
35: Filter fds with revents mask in a fdarray : Ok
36: Add fd to a fdarray, making it autogrow : Ok
37: kmod_path__parse : Ok
38: Thread map : Ok
39: LLVM search and compile :
39.1: Basic BPF llvm compile : Skip
39.2: kbuild searching : Skip
39.3: Compile source for BPF prologue generation : Skip
39.4: Compile source for BPF relocation : Skip
40: Session topology : Ok
41: BPF filter :
41.1: Basic BPF filtering : Skip
41.2: BPF pinning : Skip
41.3: BPF prologue generation : Skip
41.4: BPF relocation checker : Skip
42: Synthesize thread map : Ok
43: Remove thread map : Ok
44: Synthesize cpu map : Ok
45: Synthesize stat config : Ok
46: Synthesize stat : Ok
47: Synthesize stat round : Ok
48: Synthesize attr update : Ok
49: Event times : Ok
50: Read backward ring buffer : Ok
51: Print cpu map : Ok
52: Probe SDT events : Ok
53: is_printable_array : Ok
54: Print bitmap : Ok
55: perf hooks : Ok
56: builtin clang support : Skip (not compiled in)
57: unit_number__scnprintf : Ok
58: mem2node : Ok
59: x86 rdpmc : Ok
60: Convert perf time to TSC : Ok
61: DWARF unwind : Ok
62: x86 instruction decoder - new instructions : Ok
63: x86 bp modify : Ok
64: Check open filename arg using perf trace + vfs_getname: Skip
65: Add vfs_getname probe to get syscall args filenames : Skip
66: probe libc's inet_pton & backtrace it with ping : Ok
67: Use vfs_getname probe to get syscall args filenames : Skip

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