linux/Documentation/trace
Linus Torvalds e919a3f705 Minor tracing updates:
- Make buffer_percent read/write. The buffer_percent file is how users can
   state how long to block on the tracing buffer depending on how much
   is in the buffer. When it hits the "buffer_percent" it will wake the
   task waiting on the buffer. For some reason it was set to read-only.
   This was not noticed because testing was done as root without SELinux,
   but with SELinux it will prevent even root to write to it without having
   CAP_DAC_OVERRIDE.
 
 - The "touched_functions" was added this merge window, but one of the
   reasons for adding it was not implemented. That was to show what functions
   were not only touched, but had either a direct trampoline attached to
   it, or a kprobe or live kernel patching that can "hijack" the function
   to run a different function. The point is to know if there's functions
   in the kernel that may not be behaving as the kernel code shows. This can
   be used for debugging. TODO: Add this information to kernel oops too.
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Merge tag 'trace-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull more tracing updates from Steven Rostedt:

 - Make buffer_percent read/write.

   The buffer_percent file is how users can state how long to block on
   the tracing buffer depending on how much is in the buffer. When it
   hits the "buffer_percent" it will wake the task waiting on the
   buffer. For some reason it was set to read-only.

   This was not noticed because testing was done as root without
   SELinux, but with SELinux it will prevent even root to write to it
   without having CAP_DAC_OVERRIDE.

 - The "touched_functions" was added this merge window, but one of the
   reasons for adding it was not implemented.

   That was to show what functions were not only touched, but had either
   a direct trampoline attached to it, or a kprobe or live kernel
   patching that can "hijack" the function to run a different function.
   The point is to know if there's functions in the kernel that may not
   be behaving as the kernel code shows. This can be used for debugging.

   TODO: Add this information to kernel oops too.

* tag 'trace-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ftrace: Add MODIFIED flag to show if IPMODIFY or direct was attached
  tracing: Fix permissions for the buffer_percent file
2023-05-05 13:11:02 -07:00
..
coresight Documentation: coresight: tpdm: Add dummy comment after sysfs list 2023-01-23 11:59:57 +00:00
postprocess docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
rv rv/monitor: Add the wwnr monitor 2022-07-30 14:01:30 -04:00
boottime-trace.rst docs/trace: fix a label of boottime-trace 2021-12-10 13:58:53 -07:00
events-kmem.rst mm/lru: revise the comments of lru_lock 2020-12-15 14:48:04 -08:00
events-msr.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
events-nmi.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
events-power.rst PM: QoS: Simplify definitions of CPU latency QoS trace events 2020-02-13 11:26:39 +01:00
events.rst tracing updates for 6.3: 2023-02-23 10:20:49 -08:00
fprobe.rst docs: tracing: Update fprobe documentation 2023-03-28 18:52:23 -04:00
ftrace-design.rst sh/ftrace: Move arch_ftrace_nmi_{enter,exit} into nmi exception 2020-05-19 15:51:18 +02:00
ftrace-uses.rst ftrace/documentation: Fix RST C code blocks 2020-11-18 11:45:23 -05:00
ftrace.rst Minor tracing updates: 2023-05-05 13:11:02 -07:00
function-graph-fold.vim
hisi-ptt.rst docs: trace: Add HiSilicon PTT device driver documentation 2022-09-08 18:41:22 -06:00
histogram-design.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
histogram.rst tracing updates for 6.3: 2023-02-23 10:20:49 -08:00
hwlat_detector.rst trace/hwlat: Implement the per-cpu mode 2021-06-25 18:23:22 -04:00
index.rst docs: trace: Add HiSilicon PTT device driver documentation 2022-09-08 18:41:22 -06:00
intel_th.rst docs: trace: fix a typo 2020-08-11 10:22:15 -06:00
kprobes.rst kprobes: kretprobe events missing on 2-core KVM guest 2022-12-15 08:48:40 +09:00
kprobetrace.rst probes updates for 6.3: 2023-02-23 13:03:08 -08:00
mmiotrace.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
osnoise-tracer.rst Documentation/osnoise: Add osnoise/options documentation 2022-12-10 13:36:05 -05:00
ring-buffer-design.rst docs: trace: ring-buffer-design.rst: use the new SPDX tag 2020-09-24 11:07:44 -06:00
stm.rst Documentation: trace/stm: drop doubled words 2020-07-05 14:40:55 -06:00
sys-t.rst stm class: Document the MIPI SyS-T protocol usage 2018-10-11 12:12:55 +02:00
timerlat-tracer.rst Delete duplicate words from kernel docs 2022-09-27 13:21:43 -06:00
tracepoint-analysis.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
tracepoints.rst tracepoints: Add helper to test if tracepoint is enabled in a header 2020-09-25 18:01:35 -04:00
uprobetracer.rst docs: ftrace: always use canonical ftrace path 2023-01-31 14:02:30 -07:00
user_events.rst tracing/user_events: Update documentation for ABI 2023-03-29 06:52:09 -04:00