perf record --off-cpu: Add --off-cpu-thresh option

Specify the threshold for dumping offcpu samples with --off-cpu-thresh,
the unit is milliseconds. Default value is 500ms.

Example:

  perf record --off-cpu --off-cpu-thresh 824

The example above collects direct off-cpu samples where the off-cpu time
is longer than 824ms.

Committer testing:

After commenting out the end off-cpu dump to have just the ones that are
added right after the task is scheduled back, and using a threshould of
1000ms, we see some periods (the 5th column, just before "offcpu-time"
in the 'perf script' output) that are over 1000.000.000 nanoseconds:

  root@number:~# perf record --off-cpu --off-cpu-thresh 10000
  ^C[ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 3.902 MB perf.data (34335 samples) ]
  root@number:~# perf script
<SNIP>
  Isolated Web Co   59932 [028] 63839.594437: 1000049427 offcpu-time:
             7fe63c7976c2 __syscall_cancel_arch_end+0x0 (/usr/lib64/libc.so.6)
             7fe63c78c04c __futex_abstimed_wait_common+0x7c (/usr/lib64/libc.so.6)
             7fe63c78e928 pthread_cond_timedwait@@GLIBC_2.3.2+0x178 (/usr/lib64/libc.so.6)
             5599974a9fe7 mozilla::detail::ConditionVariableImpl::wait_for(mozilla::detail::MutexImpl&, mozilla::BaseTimeDuration<mozilla::TimeDurationValueCalculator> const&)+0xe7 (/usr/lib64/fir>
                100000000 [unknown] ([unknown])

          swapper       0 [025] 63839.594459:     195724    cycles:P:  ffffffffac328270 read_tsc+0x0 ([kernel.kallsyms])
  Isolated Web Co   59932 [010] 63839.594466: 1000055278 offcpu-time:
             7fe63c7976c2 __syscall_cancel_arch_end+0x0 (/usr/lib64/libc.so.6)
             7fe63c78ba24 __syscall_cancel+0x14 (/usr/lib64/libc.so.6)
             7fe63c804c4e __poll+0x1e (/usr/lib64/libc.so.6)
             7fe633b0d1b8 PollWrapper(_GPollFD*, unsigned int, int) [clone .lto_priv.0]+0xf8 (/usr/lib64/firefox/libxul.so)
                10000002c [unknown] ([unknown])

          swapper       0 [027] 63839.594475:     134433    cycles:P:  ffffffffad4c45d9 irqentry_enter+0x19 ([kernel.kallsyms])
          swapper       0 [028] 63839.594499:     215838    cycles:P:  ffffffffac39199a switch_mm_irqs_off+0x10a ([kernel.kallsyms])
  MediaPD~oder #1 1407676 [027] 63839.594514:     134433    cycles:P:      7f982ef5e69f dct_IV(int*, int, int*)+0x24f (/usr/lib64/libfdk-aac.so.2.0.0)
          swapper       0 [024] 63839.594524:     267411    cycles:P:  ffffffffad4c6ee6 poll_idle+0x56 ([kernel.kallsyms])
  MediaSu~sor #75 1093827 [026] 63839.594555:     332652    cycles:P:      55be753ad030 moz_xmalloc+0x200 (/usr/lib64/firefox/firefox)
          swapper       0 [027] 63839.594616:     160548    cycles:P:  ffffffffad144840 menu_select+0x570 ([kernel.kallsyms])
  Isolated Web Co   14019 [027] 63839.595120: 1000050178 offcpu-time:
             7fc9537cc6c2 __syscall_cancel_arch_end+0x0 (/usr/lib64/libc.so.6)
             7fc9537c104c __futex_abstimed_wait_common+0x7c (/usr/lib64/libc.so.6)
             7fc9537c3928 pthread_cond_timedwait@@GLIBC_2.3.2+0x178 (/usr/lib64/libc.so.6)
             7fc95372a3c8 pt_TimedWait+0xb8 (/usr/lib64/libnspr4.so)
             7fc95372a8d8 PR_WaitCondVar+0x68 (/usr/lib64/libnspr4.so)
             7fc94afb1f7c WatchdogMain(void*)+0xac (/usr/lib64/firefox/libxul.so)
             7fc947498660 [unknown] ([unknown])
             7fc9535fce88 [unknown] ([unknown])
             7fc94b620e60 WatchdogManager::~WatchdogManager()+0x0 (/usr/lib64/firefox/libxul.so)
          fff8548387f8b48 [unknown] ([unknown])

          swapper       0 [003] 63839.595712:     212948    cycles:P:  ffffffffacd5b865 acpi_os_read_port+0x55 ([kernel.kallsyms])
<SNIP>

Suggested-by: Arnaldo Carvalho de Melo <[email protected]>
Suggested-by: Ian Rogers <[email protected]>
Suggested-by: Namhyung Kim <[email protected]>
Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Howard Chu <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Tested-by: Gautam Menghani <[email protected]>
Tested-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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