On Thu, Mar 09, 2023 at 10:06:41AM -0800, Yang Shi wrote:
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I reviewed your shared dump, the bad and good perf data both contain the dummy event with 'text_poke = 1'. Could you confirm the shared dump in your previous email is correct or not?
Oops, sorry. I pasted the wrong log. The good one looks like (generated by v5.19):
# captured on : Wed Mar 8 18:02:58 2023 # header version : 1 # data offset : 408 # data size : 22640 # feat offset : 23048 # hostname : fedora # os release : 6.2.0-coresight+ # perf version : 5.19.g3d7cb6b04c3f # arch : aarch64 # nrcpus online : 128 # nrcpus avail : 128 # cpuid : 0x00000000c00fac30 # total memory : 2108862504 kB # cmdline : /home/yshi/linux/tools/perf/perf record -e cs_etm/@tmc_etf63/k --kcore --per-thread -- taskset --cpu-list 1 uname # event : name = cs_etm/@tmc_etf63/k, , id = { 3832 }, type = 9, size = 128, { sample_period, sample_freq } = 1, sample_type = IP|TID|IDENTIFIER, read_format = ID, d isabled = 1, exclude_user = 1, exclude_hv = 1, enable_on_exec = 1, sample_id_all = 1, { bp_len, config2 } = 0x12792918 # event : name = dummy:u, , id = { 3833 }, type = 1, size = 128, config = 0x9, { sample_period, sample_freq } = 1, sample_type = IP|TID|IDENTIFIER, read_format = ID, disabled = 1, exclude_kernel = 1, exclude_hv = 1, mmap = 1, comm = 1, enable_on_exec = 1, task = 1, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, context_switch = 1, ksymbol = 1, bpf_event = 1 # CPU_TOPOLOGY info available, use -I to display # NUMA_TOPOLOGY info available, use -I to display # pmu mappings: armv8_pmuv3_0 = 8, software = 1, arm_cmn_0 = 10, uprobe = 7, cs_etm = 9, breakpoint = 5, tracepoint = 2, arm_cmn_1 = 11, kprobe = 6 # contains AUX area data (e.g. instruction trace) # CACHE info available, use -I to display # time of first sample : 18446744073.709551 # time of last sample : 18446744073.709551 # sample duration : 0.000 ms # MEM_TOPOLOGY info available, use -I to display # missing features: TRACING_DATA CPUDESC BRANCH_STACK GROUP_DESC STAT CLOCKID DIR_FORMAT COMPRESSED CPU_PMU_CAPS CLOCK_DATA HYBRID_TOPOLOGY HYBRID_CPU_PMU_CAPS
Thanks for confirmation.
Just a quick summary, here we have two issues:
- With command: perf record -e cs_etm/@tmc_etf63/k --kcore --per-thread \ -- taskset --cpu-list 1 uname",
perf doesn't enable "text poke" attribution.
- With command: perf record -e cs_etm/@tmc_etf63/k --kcore --per-thread \ -- taskset --cpu-list 1 true (in your previous email), or ... perf record --kcore -e cs_etm/@tmc_etf63/k --per-thread \ -- taskset --cpu-list 1 uname (in your shared perf data file),
perf enables "text poke" attribution, in this case, perf fails to decode Arm CoreSight trace data.
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Do you mind to share the bad perf.data file with James and me?
Please check the attachment out. Thanks for looking into this problem.
Thank you for sharing the data. We will look into it.
Leo