[v6,00/10] libtracefs: Facilitate adding and removing kprobes

Message

Steven Rostedt July 2, 2021, 6:56 p.m. UTC

Add a tracefs_kprobe_raw() to facilitate adding kprobe events. It's
denoted as "raw" because it still requires knowing the complex format of
a kprobe, but at least it helps with other formats:

 p:[[system/]event] addr fmt

The user only needs to know the "fmt" part above, and not worry about
what file to open, or how to open it.

Also add a tracefs_kprobe_clear() to clear all kprobes and a
tracefs_kprobe_clear_probe() to clear an individual kprobe. Both have a
"force" parameter, that if set, will then try to disable the kprobe in
all instances (including the top) and then remove the kprobe(s).

Changes since v4: https://lore.kernel.org/linux-trace-devel/[e-mail]/
 - Rename tracefs_kprobe_type() to tracefs_kprobe_info() that not only returns the
   type, but also allows the user to get the strings for the type (before the ':')
   the addr, and the format.

 - Have tracefs_get_kprobes() take a type parameter to explicitly ask for a
   kprobes or kretprobes.

 - Added a helper function parse_kprobes() to remove the parsing of the
   kprobe_events file out of the main logic.

 - Updated the tracefs_utest to use the kprobe APIs instead of just writing
   to the kprobe file directly (This helped catch a lot of bugs).

Steven Rostedt (VMware) (10):
  libtracefs: Implement tracefs_instances()
  libtracefs: Implement tracefs_kprobe_raw()
  libtracefs: Implement tracefs_kretprobe_raw()
  libtracefs: Implement tracefs_get_kprobes()
  libtracefs: Add helper function to parse kprobes
  libtracefs: Implement tracefs_kprobe_info()
  libtracefs: Implement tracefs_kprobe_clear_all() to remove all kprobes
  libtracefs: Implement tracefs_kprobe_clear_probe()
  libtracefs: Add man pages for kprobe functions
  libtracefs: Update the unit tests to use the kprobe API instead

 Documentation/libtracefs-kprobes.txt | 297 ++++++++++++++++
 include/tracefs.h                    |  17 +
 src/Makefile                         |   1 +
 src/tracefs-instance.c               |  76 +++++
 src/tracefs-kprobes.c                | 485 +++++++++++++++++++++++++++
 utest/tracefs-utest.c                | 195 +++++++++--
 6 files changed, 1042 insertions(+), 29 deletions(-)
 create mode 100644 Documentation/libtracefs-kprobes.txt
 create mode 100644 src/tracefs-kprobes.c

Comments

Steven Rostedt July 2, 2021, 6:59 p.m. UTC | #1

On Fri,  2 Jul 2021 14:56:06 -0400
Steven Rostedt <[e-mail]> wrote:

> Changes since v4: https://lore.kernel.org/linux-trace-devel/[e-mail]/

Cut and paste error. That should have been "Changes since v5:"

-- Steve