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SubjectRe: Intel PT not work on 4.5.0-rc
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On 25/02/2016 4:21 p.m., Arnaldo Carvalho de Melo wrote:
> Hi Adrian,
>
> While fixing a problem I introducing in parsing 'intel_pt//',
> i.e. the empty '//' part, which is fixed in my perf/core by now, I tried
> using intel_pt with 4.5.0-rc4 and couldn't get any trace :-\
>
> Talking with Jiri he tried it on his side, also a Broadwell
> machine, and it worked, same tooling (acme/perf/core) but with a fedora
> kernel, 4.3.5-200.fc22.x86_64.
>
> Later I'll try switching to the kernel Jiri is using to see if it works
> for me with that one.
>
> I'm busy now and this Broadwell machine is my main workstation,
> can you check if you reproduce this problem?

I am on vacation until some time next week. I will try to look at
it before then but might not manage it.

>
> [root@jouet ~]# perf --version
> perf version 4.5.rc4.gbb109a
> [root@jouet ~]# perf record -e intel_pt//u -a sleep 10
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.767 MB perf.data ]
> [root@jouet ~]# perf evlist -v
> intel_pt//u: type: 7, size: 112, config: 0x400, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, sample_id_all: 1
> dummy:u: type: 1, size: 112, config: 0x9, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, context_switch: 1
> [root@jouet ~]# perf script
> [root@jouet ~]#
>
> From 'perf report -D'
>
> 0x1a8 [0x88]: event: 70
> .
> . ... raw event: size 136 bytes
> . 0000: 46 00 00 00 00 00 88 00 01 00 00 00 00 00 00 00 F...............
> . 0010: 07 00 00 00 00 00 00 00 1f 00 00 00 00 00 00 00 ................
> . 0020: 14 01 58 31 00 00 00 00 69 84 20 d9 d5 3b 00 00 ..X1....i. ..;..
> . 0030: 01 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 ................
> . 0040: 00 08 00 00 00 00 00 00 03 00 00 00 00 00 00 00 ................
> . 0050: 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................
> . 0060: 00 02 00 00 00 00 00 00 00 c0 03 00 00 00 00 00 ................
> . 0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> . 0080: 02 00 00 00 00 00 00 00 ........
>
> 0x1a8 [0x88]: PERF_RECORD_AUXTRACE_INFO type: 1
> PMU Type 7
> Time Shift 31
> Time Muliplier 827851028
> Time Zero 65789656859753
> Cap Time Zero 1
> TSC bit 0x400
> NoRETComp bit 0x800
> Have sched_switch 3
> Snapshot mode 0
> Per-cpu maps 1
> MTC bit 0x200
> TSC:CTC numerator 0
> TSC:CTC denominator 0
> CYC bit 0x2
>
> [root@jouet ~]# perf report -D | tail -13
> Aggregated stats: (excludes AUX area (e.g. instruction trace) decoded / synthesized events)
> TOTAL events: 21753
> MMAP events: 130
> COMM events: 596
> EXIT events: 2
> FORK events: 594
> MMAP2 events: 8541

There ought to be AUX events here, so it looks like no data has been captured,
so a problem with recording.

> ITRACE_START events: 4
> SWITCH_CPU_WIDE events: 11882
> FINISHED_ROUND events: 3
> AUXTRACE_INFO events: 1
> intel_pt//u stats:
> dummy:u stats:
> [root@jouet ~]#
>

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