Messages in this thread | | | Date | Thu, 17 Aug 2023 11:17:55 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: RFE: perf lock contention --bpf on an RT kernel |
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Em Thu, Aug 17, 2023 at 10:57:25AM -0300, Arnaldo Carvalho de Melo escreveu: > Hi Namhyung, I noticed this when trying to use the BPF mode of perf lock > contention on an RT kernel: > > > I tried up to now the following patch, it loads, but produces no output > :-\
To check that a BPF skel based programs works with this kernel I tried:
[root@nine perf-tools-next]# uname -a Linux nine 5.14.0-284.18.1.rt14.303.el9_2.x86_64 #1 SMP PREEMPT_RT Wed May 31 13:18:55 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux [root@nine perf-tools-next]# tools/bpf/runqslower/.output/runqslower 50 | head -20 Tracing run queue latency higher than 50 us TIME COMM PID LAT(us) 11:13:47 ktimers/5 60 54 11:13:47 irq_work/5 62 124 11:13:47 ktimers/5 60 53 11:13:47 irq_work/5 62 88 11:13:47 swapper/0 3942 59 11:13:47 ktimers/4 52 55 11:13:47 irq_work/4 54 102 11:13:47 swapper/0 3942 51 11:13:47 ktimers/5 60 54 11:13:47 irq_work/5 62 93 11:13:47 swapper/0 3942 51 11:13:47 kworker/2:2 38 141 11:13:47 swapper/4 14 90 11:13:47 swapper/6 642 102 11:13:47 swapper/7 77 52 11:13:47 ktimers/7 76 103 11:13:47 irq_work/7 78 92 11:13:47 ktimers/6 68 83 [root@nine perf-tools-next]#
- Arnaldo
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