Re: [PATCH] perf: Fix sibling iteration

From: Alexey Budankov
Date: Fri Mar 16 2018 - 05:59:53 EST

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Hi,
On 15.03.2018 20:01, Peter Zijlstra wrote:
> Subject: perf: Fix sibling iteration
> From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Date: Thu Mar 15 17:36:56 CET 2018
>
> Mark noticed that the change to sibling_list changed some iteration
> semantics; because previously we used group_list as list entry,
> sibling events would always have an empty sibling_list.
>
> But because we now use sibling_list for both list head and list entry,
> siblings will report as having siblings.
>
> Fix this with a custom for_each_sibling_event() iterator.
>
> Suggested-by: Mark Rutland <mark.rutland@xxxxxxx>
> Reported-by: Mark Rutland <mark.rutland@xxxxxxx>
> Fixes: 8343aae66167 ("perf/core: Remove perf_event::group_entry")
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> ---

Applied to tip repo and run testing on Fedora 27/x86_64 (client skylake 8 cores):

make -C tools/perf/ build-test
make: Entering directory '/root/abudanko/tip/tools/perf'
- tarpkg: ./tests/perf-targz-src-pkg .
- /root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP: cd . && make FEATURE_DUMP_COPY=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP feature-dump
cd . && make FEATURE_DUMP_COPY=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP feature-dump
make_with_babeltrace_O: cd . && make LIBBABELTRACE=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.icWjm9G83i DESTDIR=/tmp/tmp.k3gS9nZWn1
make_no_libperl_O: cd . && make NO_LIBPERL=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.cFFDwS0GI0 DESTDIR=/tmp/tmp.ZSHnATR3nx
make_no_gtk2_O: cd . && make NO_GTK2=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.RnSxaWFXYe DESTDIR=/tmp/tmp.fQ1csVAL81
make_no_newt_O: cd . && make NO_NEWT=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.IVFn6QEq17 DESTDIR=/tmp/tmp.6eBvM9A4kX
make_no_backtrace_O: cd . && make NO_BACKTRACE=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.EM0Q3e692P DESTDIR=/tmp/tmp.ZwfkJkPCHP
make_no_libdw_dwarf_unwind_O: cd . && make NO_LIBDW_DWARF_UNWIND=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.3Vo6EX89gQ DESTDIR=/tmp/tmp.AYf0P4xIMu
make_no_scripts_O: cd . && make NO_LIBPYTHON=1 NO_LIBPERL=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.wKJnsI2J6Y DESTDIR=/tmp/tmp.dbkavZubVA
make_no_auxtrace_O: cd . && make NO_AUXTRACE=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.JC2HxLAtWy DESTDIR=/tmp/tmp.m3kuS2SjoJ
make_tags_O: cd . && make tags FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.yNJ1JYIHRe DESTDIR=/tmp/tmp.DfpYbrOHyN
make_doc_O: cd . && make doc FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.4oRV5wwXRG DESTDIR=/tmp/tmp.hoHvRcWGMz
make_clean_all_O: cd . && make clean all FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.VVZwGQwAsl DESTDIR=/tmp/tmp.otyKC854jC
make_no_demangle_O: cd . && make NO_DEMANGLE=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.Pqn88IDBJe DESTDIR=/tmp/tmp.26CemSq8rl
make_install_bin_O: cd . && make install-bin FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.CJ5gfJRJ88 DESTDIR=/tmp/tmp.hS0o8yXeK7
make_install_O: cd . && make install FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.RPRcY6uDq8 DESTDIR=/tmp/tmp.IW01wtATTd
make_install_prefix_slash_O: cd . && make install prefix=/tmp/krava/ FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.gvOLjRABv2 DESTDIR=/tmp/tmp.6OMgy187rT
make_no_slang_O: cd . && make NO_SLANG=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.5IfNr3OiDn DESTDIR=/tmp/tmp.28yzBF5bDE
make_perf_o_O: cd . && make perf.o FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.CTmyGT5ZNU DESTDIR=/tmp/tmp.ohiadqvLzw
make_with_clangllvm_O: cd . && make LIBCLANGLLVM=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.bDoP5XgtvV DESTDIR=/tmp/tmp.Zfn944JFmO
make_no_libelf_O: cd . && make NO_LIBELF=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.mzs7boZhfA DESTDIR=/tmp/tmp.P9AgDYEA3j
make_pure_O: cd . && make FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.pJGEhkbl9n DESTDIR=/tmp/tmp.msv5mDxu4F
make_install_prefix_O: cd . && make install prefix=/tmp/krava FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.QoERhLwZDr DESTDIR=/tmp/tmp.ZEmUFt1UnF
make_no_libpython_O: cd . && make NO_LIBPYTHON=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.YKoeoBNF82 DESTDIR=/tmp/tmp.iClT1aOD26
make_no_libbionic_O: cd . && make NO_LIBBIONIC=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.bc9qEJlJD5 DESTDIR=/tmp/tmp.a4qXcSNfmD
make_help_O: cd . && make help FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.tFu00ESbDc DESTDIR=/tmp/tmp.p0P0FFCbTS
make_no_libunwind_O: cd . && make NO_LIBUNWIND=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.E7gtOpuChq DESTDIR=/tmp/tmp.AzdP8T1nhv
make_util_map_o_O: cd . && make util/map.o FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.OceO9gPHwz DESTDIR=/tmp/tmp.CRisi5nnWs
make_no_libaudit_O: cd . && make NO_LIBAUDIT=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.EpEWtVMRoE DESTDIR=/tmp/tmp.QgQTHcB26V
- /root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP_STATIC: cd . && make FEATURE_DUMP_COPY=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP_STATIC LDFLAGS='-static' feature-dump
cd . && make FEATURE_DUMP_COPY=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP_STATIC LDFLAGS='-static' feature-dump
make_static_O: cd . && make LDFLAGS=-static FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP_STATIC O=/tmp/tmp.wRr6FijvF7 DESTDIR=/tmp/tmp.An2D2JBPYD
make_debug_O: cd . && make DEBUG=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.pXJDRBfMso DESTDIR=/tmp/tmp.Nhx7cYQ3qk
make_no_libbpf_O: cd . && make NO_LIBBPF=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.ldWtmgclEH DESTDIR=/tmp/tmp.Xs4273yDUM
make_minimal_O: cd . && make NO_LIBPERL=1 NO_LIBPYTHON=1 NO_NEWT=1 NO_GTK2=1 NO_DEMANGLE=1 NO_LIBELF=1 NO_LIBUNWIND=1 NO_BACKTRACE=1 NO_LIBNUMA=1 NO_LIBAUDIT=1 NO_LIBBIONIC=1 NO_LIBDW_DWARF_UNWIND=1 NO_AUXTRACE=1 NO_LIBBPF=1 NO_LIBCRYPTO=1 NO_SDT=1 NO_JVMTI=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.xLZ9fBxwjy DESTDIR=/tmp/tmp.DuqT8srbXJ
make_util_pmu_bison_o_O: cd . && make util/pmu-bison.o FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.vFgqAGKa4i DESTDIR=/tmp/tmp.gwbtrK8JK7
make_no_libnuma_O: cd . && make NO_LIBNUMA=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.D9OZ9CynZ7 DESTDIR=/tmp/tmp.lt01zXW0iy
make_no_ui_O: cd . && make NO_NEWT=1 NO_SLANG=1 NO_GTK2=1 FEATURES_DUMP=/root/abudanko/tip/tools/perf/BUILD_TEST_FEATURE_DUMP O=/tmp/tmp.yJnU4c9jaG DESTDIR=/tmp/tmp.C7HAoPao2W
OK
make: Leaving directory '/root/abudanko/tip/tools/perf'

perf test
1: vmlinux symtab matches kallsyms : Ok
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 : Ok
17: Match and link multiple hists : Ok
18: 'import perf' in python : Ok
19: Breakpoint overflow signal handler : Ok
20: Breakpoint overflow sampling : Ok
21: Breakpoint accounting : Ok
22: Number of exit events of a simple workload : Ok
23: Software clock events period values : Ok
24: Object code reading : Ok
25: Sample parsing : Ok
26: Use a dummy software event to keep tracking : Ok
27: Parse with no sample_id_all bit set : Ok
28: Filter hist entries : Ok
29: Lookup mmap thread : Ok
30: Share thread mg : Ok
31: Sort output of hist entries : Ok
32: Cumulate child hist entries : Ok
33: Track with sched_switch : Ok
34: Filter fds with revents mask in a fdarray : Ok
35: Add fd to a fdarray, making it autogrow : Ok
36: kmod_path__parse : Ok
37: Thread map : Ok
38: LLVM search and compile :
38.1: Basic BPF llvm compile : Skip
38.2: kbuild searching : Skip
38.3: Compile source for BPF prologue generation : Skip
38.4: Compile source for BPF relocation : Skip
39: Session topology : Ok
40: BPF filter :
40.1: Basic BPF filtering : Skip
40.2: BPF pinning : Skip
40.3: BPF prologue generation : Skip
40.4: BPF relocation checker : Skip
41: Synthesize thread map : Ok
42: Remove thread map : Ok
43: Synthesize cpu map : Ok
44: Synthesize stat config : Ok
45: Synthesize stat : Ok
46: Synthesize stat round : Ok
47: Synthesize attr update : Ok
48: Event times : Ok
49: Read backward ring buffer : Ok
50: Print cpu map : Ok
51: Probe SDT events : Ok
52: is_printable_array : Ok
53: Print bitmap : Ok
54: perf hooks : Ok
55: builtin clang support : Skip (not compiled in)
56: unit_number__scnprintf : Ok
57: x86 rdpmc : Ok
58: Convert perf time to TSC : Ok
59: DWARF unwind : Ok
60: x86 instruction decoder - new instructions : Ok
61: Use vfs_getname probe to get syscall args filenames : Ok
62: Add vfs_getname probe to get syscall args filenames : Ok
63: Check open filename arg using perf trace + vfs_getname: Ok
64: probe libc's inet_pton & backtrace it with ping : Ok

Vincent Weaver's tests (https://github.com/deater/perf_event_tests)
using run_test.sh script:

**** RUNNING perf_event_tests ****
Linux nntvtune39 4.16.0-rc4+ #1 SMP Mon Mar 12 21:17:37 MSK 2018 x86_64 x86_64 x86_64 GNU/Linux

* Testing /proc/sys/kernel/perf_event_paranoid setting
+ tests/utils/check_paranoid
Checking /proc/sys/kernel/perf_event_paranoid setting... PASSED

* Checking infrastructure
+ tests/utils/get_cache_info
Seeing if cache info is provided by the kernel... PASSED
+ tests/sysfs/events
Testing format of event files under /sys/... PASSED

* Checking generalized events
+ tests/generalized_events/branches
Testing "branches" generalized event... PASSED
+ tests/generalized_events/branch-misses
Testing "branch-misses" generalized event... PASSED
+ tests/generalized_events/cycles
Testing "cycles" generalized event... PASSED
+ tests/generalized_events/instructions
Testing "instructions" generalized event... PASSED
+ tests/generalized_events/l1-dcache-stores
Testing "L1-dcache-stores" generalized event... PASSED
+ tests/generalized_events/l1-dcache-loads
Testing "L1-dcache-loads" generalized event... PASSED

* Checking Intel x86 specific features
+ tests/x86_intel/fixed_ctr0
Testing fixed counter 0 event... PASSED
+ tests/x86_intel/fixed_ctr1
Testing fixed counter 1 event... PASSED
+ tests/x86_intel/fixed_ctr2
Testing fixed counter 2 event... PASSED
+ tests/x86_intel/offcore_response
Testing RAW access to offcore response counters... PASSED
+ tests/x86_intel/offcore_response_mask
Testing if setting invalid offcore bits is blocked... PASSED
+ tests/x86_intel/uncore_events
Testing uncore events... PASSED

* Checking breakpoint support
+ tests/breakpoints/breakpoint_support
Testing hardware breakpoints... PASSED

* Checking basic perf_event functionality
+ tests/attr_fields/disabled
Testing disabled bit... PASSED
+ tests/attr_fields/exclusive
Testing exclusive eventsets... PASSED
+ tests/attr_fields/format_id_support
Testing for FORMAT_ID support... PASSED
+ tests/attr_fields/inherit
Testing inherit... PASSED
+ tests/attr_fields/inherit_stat
Testing inherit_stat... UNEXPLAINED
+ tests/attr_fields/pinned
Testing pinned... PASSED
+ tests/attr_fields/read_format_range_check
Testing attr->read_format invalid bits... PASSED
+ tests/attr_fields/sample_type_range_check
Testing attr->sample_type invalid bits... PASSED
+ tests/attr_fields/exclude_user
Testing exclude_user... PASSED
+ tests/attr_fields/exclude_kernel
Testing exclude_kernel... PASSED
+ tests/attr_fields/exclude_hv
Testing exclude_hv... PASSED
+ tests/attr_fields/exclude_guest
Testing exclude_guest... PASSED
+ tests/attr_fields/exclude_host
Testing exclude_host... PASSED
+ tests/flags/flags_range_check
Testing flags invalid bits... PASSED
+ tests/flags/flags_cgroup
Testing PERF_FLAG_PID_CGROUP flag... PASSED
+ tests/flags/flags_fd_no_group
Testing PERF_FLAG_FD_NO_GROUP flag... PASSED
+ tests/flags/flags_fd_output
Testing PERF_FLAG_FD_OUTPUT flag... KNOWN KERNEL BUG
+ tests/socket/socket_pass
Testing passing fd over a socket... PASSED

* Checking attr.size behavior
+ tests/size/too_big
Testing attr > kernel supported size... PASSED
+ tests/size/too_little
Testing attr < kernel supported size... PASSED
+ tests/size/just_right
Testing attr is kernel supported size... PASSED
+ tests/size/header_mismatch
Testing header vs kernel attr size... PASSED

* Checking perf_event ioctl calls
+ tests/ioctl/ioctl_flag_group
Testing PERF_IOC_FLAG_GROUP... PASSED
+ tests/ioctl/ioctl_id
Testing ioctl(PERF_EVENT_IOC_ID)... PASSED
+ tests/ioctl/ioctl_period
Testing ioctl(PERF_EVENT_IOC_PERIOD)... PASSED
+ tests/ioctl/ioctl_set_filter
Testing PERF_EVENT_IOC_SET_FILTER ioctl... PASSED
+ tests/ioctl/ioctl_set_output
Testing PERF_EVENT_IOC_SET_OUTPUT ioctl... PASSED

* Checking error returns
+ tests/error_returns/e2big
Testing E2BIG errors... PASSED
+ tests/error_returns/eacces
Testing EACCES generation... FAILED
+ tests/error_returns/ebadf
Testing EBADF generation... PASSED
+ tests/error_returns/efault
Testing EFAULT generation... PASSED
+ tests/error_returns/einval
Testing EINVAL generation... PASSED
+ tests/error_returns/emfile
Testing if EMFILE can be triggered... PASSED
+ tests/error_returns/enoent
Testing ENOENT generation... PASSED
+ tests/error_returns/enospc
Testing ENOSPC generation... PASSED
+ tests/error_returns/eopnotsupp
Testing EOPNOTSUPP generation... PASSED
+ tests/error_returns/eoverflow
Testing EOVERFLOW generation... PASSED
+ tests/error_returns/eperm
Testing EPERM generation... PASSED
+ tests/error_returns/esrch
Testing ESRCH generation... PASSED
+ tests/error_returns/non-existent
Testing if non-existent events fail... PASSED

* Checking multithread functionality
+ tests/multithread/fork_then_read
Testing reads in forked children... PASSED

* Checking overflow functionality
+ tests/overflow/breakpoint_overflow
Testing hardware breakpoint overflow... UNEXPLAINED
+ tests/overflow/simple_overflow_leader
Testing overflow on leaders... PASSED
+ tests/overflow/simple_overflow_sibling
Testing overflows on sibling... PASSED
+ tests/overflow/simultaneous_overflow
Testing multiple event overflow... PASSED
+ tests/overflow/simultaneous_group_overflow
Testing multiple event overflow within group... PASSED
+ tests/overflow/simul_oneshot_group_overflow
Testing simultaneous one-shot group overflow... PASSED
+ tests/overflow/single_shot_overflow
Testing single shot overflow... PASSED
+ tests/overflow/single_shot_w_enable
Testing enable vs refresh signal types... PASSED
+ tests/overflow/wakeup_events_overflow
Testing wakeup events overflow... PASSED
+ tests/overflow/overflow_requires_wakeup
Testing if we overflow w/o setting wakeup... PASSED
+ tests/overflow/overflow_poll
Testing catching overflow with poll()... PASSED
+ tests/overflow/overflow_large
Testing large sample_period... PASSED
+ tests/overflow/overflow_skid
Testing if we can skid into kernel... KNOWN KERNEL BUG

* Checking tracepoint functionality
+ tests/tracepoints/tracepoint_alias
Testing if tracepoint event ids alias... PASSED

* Checking mmap record sample functionality
+ tests/record_sample/print_record_sample
Testing record sampling... PASSED
+ tests/record_sample/validate_record_sample
Validating sample record overflow... PASSED
+ tests/record_sample/lost_record_sample
Checking behavior on mmap overflow... PASSED
+ tests/record_sample/multiple_mmap_sizes
Checking behavior of various mmap sizes... PASSED
+ tests/record_sample/sample_branch_stack
Testing PERF_SAMPLE_BRANCH_STACK... PASSED
+ tests/record_sample/record_comm
Testing PERF_RECORD_COMM... PASSED
+ tests/record_sample/record_comm_exec
Testing PERF_RECORD_COMM_EXEC... PASSED
+ tests/record_sample/record_fork
Testing PERF_RECORD_FORK... PASSED
+ tests/record_sample/record_mmap
Testing PERF_RECORD_MMAP... PASSED
+ tests/record_sample/record_mmap2
Testing PERF_RECORD_MMAP2... PASSED
+ tests/record_sample/record_mmap_data
Testing PERF_RECORD_MMAP with mmap_data... PASSED
+ tests/record_sample/sample_data_src
Testing PERF_SAMPLE_DATA_SRC... PASSED
+ tests/record_sample/sample_regs_intr
Testing PERF_SAMPLE_REGS_INTR... PASSED
+ tests/record_sample/sample_regs_user
Testing PERF_SAMPLE_REGS_USER... PASSED
+ tests/record_sample/sample_stack_user
Testing PERF_SAMPLE_STACK_USER... PASSED
+ tests/record_sample/sample_weight
Testing PERF_SAMPLE_WEIGHT... PASSED
+ tests/record_sample/overwrite_mmap
Checking trashing of mmap buffer... PASSED
+ tests/record_sample/mmap_multiple
Trying to mmap same perf_event fd multiple times... PASSED

* Checking bugs that PAPI has to work around
+ tests/bugs/sync_read_required
Testing if time running is correct without DISABLE... PASSED
+ tests/bugs/read_group_attached
Testing if FORMAT_GROUP works on attached processes... PASSED
+ tests/bugs/check_schedulability
Testing if events checked for schedulability at read... PASSED
+ tests/multiplexing/check_papi_multiplexing
Testing if schedulability checked with pinned=0... PASSED
+ tests/multiplexing/check_multiplexing
Testing if multiplexing works... PASSED

* Checking other bugs
+ tests/corner_cases/sw_start_leader
Testing start with sw event group leader... PASSED
+ tests/corner_cases/hw_sw_mix
Testing mixes of HW and SW events... KNOWN KERNEL BUG

* Checking bugs that can silently produce wrong results
+ tests/constraints/check_constraints
Testing if event constraints are enforced... SKIPPED
+ tests/corner_cases/context_switch_user_kernel
Testing if context-switches are kernel only... PASSED

* Checking interfaces that have changed over the years
+ tests/corner_cases/overflow_requires_mmap
Testing if overflow signals require ring buffer... PASSED
+ tests/corner_cases/signal_after_exec
Testing if overflow signals survive exec... PASSED
+ tests/corner_cases/sampled_notleader_refresh
Testing if refresh of group leader enables siblings... PASSED

* Checking for corner-cases in the ABI (not necessarily bugs)
+ tests/corner_cases/multiple_active
Testing multiple simultaneous measurements... PASSED
+ tests/corner_cases/max_num_events
Testing max events that can be created... PASSED
+ tests/corner_cases/max_multiplex
Testing limit of multiplexing... PASSED
+ tests/corner_cases/reset_leader
Testing reset on group leader... PASSED
+ tests/corner_cases/check_reset_mpx
Testing if reset clears multiplex fields... PASSED
+ tests/corner_cases/huge_events_start
Testing start of max events... PASSED
+ tests/corner_cases/huge_group_start
Testing start of max event group... PASSED

* Checking for fast RDPMC support
+ tests/rdpmc/rdpmc_support
Testing if userspace rdpmc reads are supported... PASSED
+ tests/rdpmc/rdpmc_validation
Testing if userspace rdpmc reads give expected results... PASSED
+ tests/rdpmc/rdpmc_multiplexing
Testing if userspace rdpmc multiplexing works... PASSED
+ tests/rdpmc/rdpmc_reset
Testing if resetting while using rdpmc works... PASSED
+ tests/rdpmc/rdpmc_group
Testing if rdpmc works with event groups... PASSED
+ tests/rdpmc/rdpmc_attach
Testing if rdpmc attach works... PASSED
+ tests/rdpmc/rdpmc_multiattach
Testing if rdpmc multi-attach works... PASSED
+ tests/rdpmc/rdpmc_multiattach_papi
Testing if rdpmc papi-multi-attach works... PASSED
+ tests/rdpmc/rdpmc_pthreads
Testing if rdpmc with pthreads works... PASSED
+ tests/rdpmc/rdpmc_pthreads_group
Testing if rdpmc with pthreads works... PASSED
+ tests/rdpmc/rdpmc_attach_multi_enable
Testing if minimized rdpmc papi-multi-attach works... PASSED
+ tests/rdpmc/rdpmc_exec
Testing if we can rdpmc in execed process... PASSED
+ tests/rdpmc/rdpmc_exec_papi
Testing if we can rdpmc in execed process (PAPI) ... PASSED

* Checking OpenMP support
+ tests/openmp/openmp_test
Testing OpenMP results... PASSED
+ tests/openmp/openmp_overflow
Testing OpenMP overflow results... PASSED
+ tests/openmp/openmp_sample
Testing OpenMP sampling results... UNEXPLAINED

* Checking proposed interface updates (not in any released kernel)
+ tests/corner_cases/ioctl_refresh_0
Testing if PERF_IOC_REFRESH with 0 works... USE CAUTION
+ tests/corner_cases/wrong_size_enospc
Testing if ENOSPC returned for wrong-sized buffer... OLD BEHAVIOR

* Checking for major bugs that are unlikely to ever be fixed
+ tests/bugs/nmi_watchdog_group_leader
Testing if NMI watchdog interferes w/ event scheduling... KNOWN KERNEL BUG

Fuzzer testing is in progress.

Thanks,
Alexey

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