Messages in this thread | | | Subject | Re: Intel PT not work on 4.5.0-rc | From | Adrian Hunter <> | Date | Thu, 25 Feb 2016 23:59:46 +0200 |
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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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