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tracing: Have persistent ring buffer print syscalls normally

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The persistent ring buffer from a previous boot has to be careful printing
events as the print formats of random events can have pointers to strings
and such that are not available.

Ftrace static events (like the function tracer event) are stable and are
printed normally.

System call event formats are also stable. Allow them to be printed
normally as well:

Instead of:

  <...>-1       [005] ...1.    57.240405: sys_enter_waitid: __syscall_nr=0xf7 (247) which=0x1 (1) upid=0x499 (1177) infop=0x7ffd5294d690 (140725988939408) options=0x5 (5) ru=0x0 (0)
  <...>-1       [005] ...1.    57.240433: sys_exit_waitid: __syscall_nr=0xf7 (247) ret=0x0 (0)
  <...>-1       [005] ...1.    57.240437: sys_enter_rt_sigprocmask: __syscall_nr=0xe (14) how=0x2 (2) nset=0x7ffd5294d7c0 (140725988939712) oset=0x0 (0) sigsetsize=0x8 (8)
  <...>-1       [005] ...1.    57.240438: sys_exit_rt_sigprocmask: __syscall_nr=0xe (14) ret=0x0 (0)
  <...>-1       [005] ...1.    57.240442: sys_enter_close: __syscall_nr=0x3 (3) fd=0x4 (4)
  <...>-1       [005] ...1.    57.240463: sys_exit_close: __syscall_nr=0x3 (3) ret=0x0 (0)
  <...>-1       [005] ...1.    57.240485: sys_enter_openat: __syscall_nr=0x101 (257) dfd=0xffffffffffdfff9c (-2097252) filename=(0xffff8b81639ca01c) flags=0x80000 (524288) mode=0x0 (0) __filename_val=/run/systemd/reboot-param
  <...>-1       [005] ...1.    57.240555: sys_exit_openat: __syscall_nr=0x101 (257) ret=0xffffffffffdffffe (-2097154)
  <...>-1       [005] ...1.    57.240571: sys_enter_openat: __syscall_nr=0x101 (257) dfd=0xffffffffffdfff9c (-2097252) filename=(0xffff8b81639ca01c) flags=0x80000 (524288) mode=0x0 (0) __filename_val=/run/systemd/reboot-param
  <...>-1       [005] ...1.    57.240620: sys_exit_openat: __syscall_nr=0x101 (257) ret=0xffffffffffdffffe (-2097154)
  <...>-1       [005] ...1.    57.240629: sys_enter_writev: __syscall_nr=0x14 (20) fd=0x3 (3) vec=0x7ffd5294ce50 (140725988937296) vlen=0x7 (7)
  <...>-1       [005] ...1.    57.242281: sys_exit_writev: __syscall_nr=0x14 (20) ret=0x24 (36)
  <...>-1       [005] ...1.    57.242286: sys_enter_reboot: __syscall_nr=0xa9 (169) magic1=0xfee1dead (4276215469) magic2=0x28121969 (672274793) cmd=0x1234567 (19088743) arg=0x0 (0)

Have:

  <...>-1       [000] ...1.    91.446011: sys_waitid(which: 1, upid: 0x4d2, infop: 0x7ffdccdadfd0, options: 5, ru: 0)
  <...>-1       [000] ...1.    91.446042: sys_waitid -> 0x0
  <...>-1       [000] ...1.    91.446045: sys_rt_sigprocmask(how: 2, nset: 0x7ffdccdae100, oset: 0, sigsetsize: 8)
  <...>-1       [000] ...1.    91.446047: sys_rt_sigprocmask -> 0x0
  <...>-1       [000] ...1.    91.446051: sys_close(fd: 4)
  <...>-1       [000] ...1.    91.446073: sys_close -> 0x0
  <...>-1       [000] ...1.    91.446095: sys_openat(dfd: 18446744073709551516, filename: 139732544945794 "/run/systemd/reboot-param", flags: O_RDONLY|O_CLOEXEC)
  <...>-1       [000] ...1.    91.446165: sys_openat -> 0xfffffffffffffffe
  <...>-1       [000] ...1.    91.446182: sys_openat(dfd: 18446744073709551516, filename: 139732544945794 "/run/systemd/reboot-param", flags: O_RDONLY|O_CLOEXEC)
  <...>-1       [000] ...1.    91.446233: sys_openat -> 0xfffffffffffffffe
  <...>-1       [000] ...1.    91.446242: sys_writev(fd: 3, vec: 0x7ffdccdad790, vlen: 7)
  <...>-1       [000] ...1.    91.447877: sys_writev -> 0x24
  <...>-1       [000] ...1.    91.447883: sys_reboot(magic1: 0xfee1dead, magic2: 0x28121969, cmd: 0x1234567, arg: 0)

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Takaya Saeki <takayas@google.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ian Rogers <irogers@google.com>
Cc: Douglas Raillard <douglas.raillard@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Link: https://lore.kernel.org/20251028231149.097404581@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-10-28 19:11:27 -04:00 • committed by Steven Rostedt (Google)
commit 25bd47a592
1 changed files with 23 additions and 4 deletions
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