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 ~]#
