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author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 13:11:02 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 13:11:02 -0700 |
commit | e919a3f7057b5ca918dea98826b39a38eff9bebb (patch) | |
tree | 614e799fb722519f7e0a43890ced165b4d825664 /kernel/trace/trace.c | |
parent | Merge tag 'locking-core-2023-05-05' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
parent | ftrace: Add MODIFIED flag to show if IPMODIFY or direct was attached (diff) | |
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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
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r-- | kernel/trace/trace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 427da2341bf0..ebc59781456a 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9661,7 +9661,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) tr->buffer_percent = 50; - trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer, + trace_create_file("buffer_percent", TRACE_MODE_WRITE, d_tracer, tr, &buffer_percent_fops); create_trace_options_dir(tr); |