Arnaldo Carvalho de Melo 728db19886 perf beauty: Introduce strtoul() for x86 MSRs ... Continuing from the previous cset comment, now that filter expression works: # perf trace -e msr:* --filter="msr!=FS_BASE && msr != IA32_TSC_DEADLINE && msr != 0x830 && msr != 0x83f && msr !=IA32_SPEC_CTRL" --filter-pids 3750 0.000 Timer/5033 msr:write_msr(msr: SYSCALL_MASK, val: 292608) 0.009 Timer/5033 msr:write_msr(msr: LSTAR, val: -1398800368) 0.010 Timer/5033 msr:write_msr(msr: TSC_AUX, val: 4) 0.050 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 45.661 gnome-terminal/12595 msr:write_msr(msr: SYSCALL_MASK, val: 292608) 45.672 gnome-terminal/12595 msr:write_msr(msr: LSTAR, val: -1398800368) 45.675 gnome-terminal/12595 msr:write_msr(msr: TSC_AUX, val: 3) 54.852 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 130.508 Timer/4050 msr:write_msr(msr: SYSCALL_MASK, val: 292608) 130.527 Timer/4050 msr:write_msr(msr: LSTAR, val: -1398800368) 130.531 Timer/4050 msr:write_msr(msr: TSC_AUX, val: 3) 140.924 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 164.738 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 603.578 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 620.809 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 690.115 JS Watchdog/4259 msr:write_msr(msr: SYSCALL_MASK, val: 292608) 690.136 JS Watchdog/4259 msr:write_msr(msr: LSTAR, val: -1398800368) 690.141 JS Watchdog/4259 msr:write_msr(msr: TSC_AUX, val: 3) 690.186 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 759.016 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) ^C[root@quaco ~]# Or look at the first 3 write_msr events for that IA32_TSC_DEADLINE to learn why it happens so often: # perf trace --max-events=3 --max-stack=8 -e msr:* --filter="msr==IA32_TSC_DEADLINE" --filter-pids 3750 0.000 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 19296732550862) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) lapic_next_deadline ([kernel.kallsyms]) clockevents_program_event ([kernel.kallsyms]) hrtimer_interrupt ([kernel.kallsyms]) smp_apic_timer_interrupt ([kernel.kallsyms]) apic_timer_interrupt ([kernel.kallsyms]) cpuidle_enter_state ([kernel.kallsyms]) 32.646 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 19296800134158) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) lapic_next_deadline ([kernel.kallsyms]) clockevents_program_event ([kernel.kallsyms]) hrtimer_start_range_ns ([kernel.kallsyms]) tick_nohz_restart_sched_tick ([kernel.kallsyms]) tick_nohz_idle_exit ([kernel.kallsyms]) do_idle ([kernel.kallsyms]) 32.802 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 19297507436922) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) lapic_next_deadline ([kernel.kallsyms]) clockevents_program_event ([kernel.kallsyms]) hrtimer_try_to_cancel ([kernel.kallsyms]) hrtimer_cancel ([kernel.kallsyms]) tick_nohz_restart_sched_tick ([kernel.kallsyms]) tick_nohz_idle_exit ([kernel.kallsyms]) # And if some of the strings can't be found: # trace -e msr:* --filter="msr!=SPECULATIVE_EXECUTION_PROBLEMS_SOLUTION && msr != IA32_TSC_DEADLINE && msr != 0x830 && msr != 0x83f && msr !=IA32_SPEC_CTRL" --filter-pids 3750 "SPECULATIVE_EXECUTION_PROBLEMS_SOLUTION" not found for "msr" in "msr:read_msr", can't set filter "(msr!=SPECULATIVE_EXECUTION_PROBLEMS_SOLUTION && msr != IA32_TSC_DEADLINE && msr != 0x830 && msr != 0x83f && msr !=IA32_SPEC_CTRL) && (common_pid != 28131 && common_pid != 3750)" # Next step is to automatically wire up the pre-existing strarrays, which there are quite a few. The strtoul() methods will be further enhanced to allow for looking at other arguments in a syscall/tracepoint, just like going from integer to string (scnprintf methods), so that those "val" lines for the msr tracepoints can be properly formatted or even resolved into some string. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-4qaai5iqjgefd11k4ddm7qg8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2019-10-09 16:25:02 -03:00
..
beauty	perf beauty: Introduce strtoul() for x86 MSRs	2019-10-09 16:25:02 -03:00
strace/groups	perf trace: Add 'string' event alias to select syscalls with string args	2019-04-01 14:49:24 -03:00