Messages in this thread | | | Date | Wed, 03 May 2023 19:14:46 -0400 | From | Steven Rostedt <> | Subject | [for-linus][PATCH 0/2] tracing: Minor updates for 6.4 |
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Minor 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 can a different function. The point is to know if there's functions in the kernel that may not be behaving as kernel code shows. This can be used for debugging. TODO: Add this information to kernel oops too.
Ondrej Mosnacek (1): tracing: Fix permissions for the buffer_percent file
Steven Rostedt (Google) (1): ftrace: Add MODIFIED flag to show if IPMODIFY or direct was attached
---- Documentation/trace/ftrace.rst | 25 +++++++++++++++++++++++++ include/linux/ftrace.h | 4 +++- kernel/trace/ftrace.c | 12 +++++++++--- kernel/trace/trace.c | 2 +- 4 files changed, 38 insertions(+), 5 deletions(-)
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