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SubjectRe: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi
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On 19.06.2017 16:26, Mark Rutland wrote:
> On Mon, Jun 19, 2017 at 04:08:32PM +0300, Alexey Budankov wrote:
>> On 16.06.2017 1:10, Alexey Budankov wrote:
>>> On 15.06.2017 22:56, Mark Rutland wrote:
>>>> On Thu, Jun 15, 2017 at 08:41:42PM +0300, Alexey Budankov wrote:
>>>>> This series of patches continues v2 and addresses captured comments.
>
>>>>> Specifically this patch replaces pinned_groups and flexible_groups
>>>>> lists of perf_event_context by red-black cpu indexed trees avoiding
>>>>> data structures duplication and introducing possibility to iterate
>>>>> event groups for a specific CPU only.
>
>>>> Have you thrown Vince's perf fuzzer at this?
>>>>
>>>> If you haven't, please do. It can be found in the fuzzer directory of:
>>>>
>>>> https://github.com/deater/perf_event_tests
>>>
>>> Accepted.
>>
>> I run the test suite and it revealed no additional regressions in
>> comparison to what I have on the clean kernel.
>>
>> However the fuzzer constantly reports some strange stacks that are
>> not seen on the clean kernel and I have no idea how that might be
>> caused by the patches.
>
> Ok; that was the kind of thing I was concerned about.
>
> What you say "strange stacks", what do you mean exactly?
>
> I take it the kernel spewing backtraces in dmesg?
>
> Can you dump those?

Here it is:

list_del corruption. prev->next should be ffff88c2c4654010, but was
ffff88c31eb0c020
[ 607.632813] ------------[ cut here ]------------
[ 607.632816] kernel BUG at lib/list_debug.c:53!
[ 607.632825] invalid opcode: 0000 [#1] SMP
[ 607.632898] Modules linked in: fuse xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c tun
bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables nfsv3
rpcsec_gss_krb5 nfsv4 arc4 md4 nls_utf8 cifs nfs ccm dns_resolver
fscache rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi
scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp
ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm
intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp hfi1 coretemp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate iTCO_wdt
intel_uncore iTCO_vendor_support joydev rdmavt intel_rapl_perf i2c_i801
ib_core ipmi_ssif mei_me mei ipmi_si ipmi_devintf tpm_tis
[ 607.633954] lpc_ich pcspkr ipmi_msghandler acpi_pad tpm_tis_core
shpchp tpm wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace
sunrpc mgag200 drm_kms_helper ttm drm igb crc32c_intel ptp pps_core dca
i2c_algo_bit
[ 607.634262] CPU: 271 PID: 28944 Comm: perf_fuzzer Not tainted
4.12.0-rc4+ #22
[ 607.634363] Hardware name: Intel Corporation S7200AP/S7200AP, BIOS
S72C610.86B.01.01.0190.080520162104 08/05/2016
[ 607.634505] task: ffff88c2d5714000 task.stack: ffffa6f9352c8000
[ 607.634597] RIP: 0010:__list_del_entry_valid+0x7b/0x90
[ 607.634670] RSP: 0000:ffffa6f9352cbad0 EFLAGS: 00010046
[ 607.634746] RAX: 0000000000000054 RBX: ffff88c2c4654000 RCX:
0000000000000000
[ 607.634845] RDX: 0000000000000000 RSI: ffff88c33fdce168 RDI:
ffff88c33fdce168
[ 607.634944] RBP: ffffa6f9352cbad0 R08: 00000000fffffffe R09:
0000000000000600
[ 607.635042] R10: 0000000000000005 R11: 0000000000000000 R12:
ffff88c2e71ab200
[ 607.635140] R13: ffff88c2c4654010 R14: 0000000000000001 R15:
0000000000000001
[ 607.635240] FS: 0000000000000000(0000) GS:ffff88c33fdc0000(0000)
knlGS:0000000000000000
[ 607.635351] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 607.635431] CR2: 00000000026be1e4 CR3: 0000002488e09000 CR4:
00000000001407e0
[ 607.635531] Call Trace:
[ 607.635583] list_del_event+0x1d7/0x210
[ 607.635646] ? perf_cgroup_attach+0x70/0x70
[ 607.635711] __perf_remove_from_context+0x3e/0x90
[ 607.635783] ? event_sched_out.isra.90+0x300/0x300
[ 607.635854] event_function_call+0xbf/0xf0
[ 607.635918] ? event_sched_out.isra.90+0x300/0x300
[ 607.635991] perf_remove_from_context+0x25/0x70
[ 607.636060] perf_event_release_kernel+0xda/0x250
[ 607.636132] ? __dentry_kill+0x10e/0x160
[ 607.636192] perf_release+0x10/0x20
[ 607.636249] __fput+0xdf/0x1e0
[ 607.636299] ____fput+0xe/0x10
[ 607.636350] task_work_run+0x83/0xb0
[ 607.636408] do_exit+0x2bc/0xbc0
[ 607.636460] ? page_add_file_rmap+0xaf/0x200
[ 607.636526] ? alloc_set_pte+0x115/0x4f0
[ 607.636587] do_group_exit+0x3f/0xb0
[ 607.636644] get_signal+0x1cc/0x5c0
[ 607.636703] do_signal+0x37/0x6a0
[ 607.636758] ? __perf_sw_event+0x4f/0x80
[ 607.636821] ? __do_page_fault+0x2e1/0x4d0
[ 607.636885] exit_to_usermode_loop+0x4c/0x92
[ 607.636953] prepare_exit_to_usermode+0x40/0x50
[ 607.637023] retint_user+0x8/0x13
[ 607.640312] RIP: 0033:0x40f4a9
[ 607.643500] RSP: 002b:00007ffc62d00668 EFLAGS: 00000206 ORIG_RAX:
ffffffffffffff02
[ 607.646678] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
000000000001100a
[ 607.649777] RDX: 00007fd5dd25bae0 RSI: 00007fd5dd259760 RDI:
00007fd5dd25a640
[ 607.652791] RBP: 00007ffc62d00680 R08: 00007fd5dd45e740 R09:
0000000000000000
[ 607.655709] R10: 00007fd5dd45ea10 R11: 0000000000000246 R12:
0000000000401980
[ 607.658530] R13: 00007ffc62d02a80 R14: 0000000000000000 R15:
0000000000000000
[ 607.661249] Code: e8 3a f7 d8 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 20 66
cb ac e8 27 f7 d8 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 e0 65 cb ac e8 14 f7
d8 ff <0f> 0b 48 89 fe 31 c0 48 c7 c7 a8 65 cb ac e8 01 f7 d8 ff 0f 0b
[ 607.666819] RIP: __list_del_entry_valid+0x7b/0x90 RSP: ffffa6f9352cbad0
[ 607.683316] ---[ end trace 34244c35550e0713 ]---
[ 607.691830] Fixing recursive fault but reboot is needed!

2:

[ 467.942059] unchecked MSR access error: WRMSR to 0x711 (tried to
write 0x00000000e8cc0055) at rIP: 0xffffffffac05fbd4
(native_write_msr+0x4/0x30)
[ 467.942068] Call Trace:
[ 467.942073] <IRQ>
[ 467.942094] ? snbep_uncore_msr_enable_event+0x54/0x60 [intel_uncore]
[ 467.942107] uncore_pmu_event_start+0x9b/0x100 [intel_uncore]
[ 467.942119] uncore_pmu_event_add+0x235/0x3a0 [intel_uncore]
[ 467.942126] ? sched_clock+0xb/0x10
[ 467.942132] ? sched_clock_cpu+0x11/0xb0
[ 467.942140] event_sched_in.isra.100+0xdf/0x250
[ 467.942145] sched_in_group+0x210/0x390
[ 467.942150] ? sched_in_group+0x390/0x390
[ 467.942155] group_sched_in_flexible_callback+0x17/0x20
[ 467.942160] perf_cpu_tree_iterate+0x45/0x75
[ 467.942165] ctx_sched_in+0x97/0x110
[ 467.942169] perf_event_sched_in+0x77/0x80
[ 467.942174] ctx_resched+0x69/0xb0
[ 467.942179] __perf_event_enable+0x208/0x250
[ 467.942184] event_function+0x93/0xe0
[ 467.942188] remote_function+0x3b/0x50
[ 467.942194] flush_smp_call_function_queue+0x71/0x120
[ 467.942200] generic_smp_call_function_single_interrupt+0x13/0x30
[ 467.942206] smp_call_function_single_interrupt+0x27/0x40
[ 467.942212] call_function_single_interrupt+0x93/0xa0
[ 467.942217] RIP: 0010:native_restore_fl+0x6/0x10
[ 467.942220] RSP: 0000:ffff88c33ba03e00 EFLAGS: 00000206 ORIG_RAX:
ffffffffffffff04
[ 467.942224] RAX: ffff88c33c8dca08 RBX: ffff88c33c8dc928 RCX:
0000000000000017
[ 467.942227] RDX: 0000000000000000 RSI: 0000000000000206 RDI:
0000000000000206
[ 467.942229] RBP: ffff88c33ba03e00 R08: 0000000000000001 R09:
0000000000007151
[ 467.942232] R10: 0000000000000000 R11: 000000000000005d R12:
ffff88c33c8dca08
[ 467.942234] R13: ffff88c33c8dc140 R14: 0000000000000001 R15:
00000000000001d8
[ 467.942241] _raw_spin_unlock_irqrestore+0x16/0x20
[ 467.942245] update_blocked_averages+0x2cf/0x4a0
[ 467.942251] rebalance_domains+0x4b/0x2b0
[ 467.942256] run_rebalance_domains+0x1d7/0x210
[ 467.942260] __do_softirq+0xd1/0x27f
[ 467.942267] irq_exit+0xe9/0x100
[ 467.942271] scheduler_ipi+0x8f/0x140
[ 467.942275] smp_reschedule_interrupt+0x29/0x30
[ 467.942280] reschedule_interrupt+0x93/0xa0
[ 467.942284] RIP: 0010:native_safe_halt+0x6/0x10
[ 467.942286] RSP: 0000:fffffffface03de0 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffff02
[ 467.942291] RAX: 0000000000000000 RBX: fffffffface104c0 RCX:
0000000000000000
[ 467.942293] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[ 467.942295] RBP: fffffffface03de0 R08: 0000006d2c5efae3 R09:
0000000000000000
[ 467.942298] R10: 0000000000000201 R11: 0000000000000930 R12:
0000000000000000
[ 467.942300] R13: fffffffface104c0 R14: 0000000000000000 R15:
0000000000000000
[ 467.942302] </IRQ>
[ 467.942308] default_idle+0x20/0x100
[ 467.942313] arch_cpu_idle+0xf/0x20
[ 467.942317] default_idle_call+0x2c/0x40
[ 467.942321] do_idle+0x158/0x1e0
[ 467.942325] cpu_startup_entry+0x71/0x80
[ 467.942330] rest_init+0x77/0x80
[ 467.942338] start_kernel+0x4a7/0x4c8
[ 467.942342] ? set_init_arg+0x5a/0x5a
[ 467.942348] ? early_idt_handler_array+0x120/0x120
[ 467.942352] x86_64_start_reservations+0x29/0x2b
[ 467.942357] x86_64_start_kernel+0x151/0x174
[ 467.942363] secondary_startup_64+0x9f/0x9f


>
> Thanks,
> Mark.
>

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