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| author | Jakub Kicinski <kuba@kernel.org> | 2024-03-22 02:14:13 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-03-22 02:15:08 +0300 |
| commit | 537c2e91d3549e5d6020bb0576cf9b54a845255f (patch) | |
| tree | c09e8a1b7d733cde19b0c72678c28fb2bc97ff6b /Documentation/trace/kprobetrace.rst | |
| parent | 237bb5f7f7f55ec5f773469a974c61a49c298625 (diff) | |
| parent | cba9ffdb9913dfe6be29f049ce920ce451ce7cc4 (diff) | |
| download | linux-537c2e91d3549e5d6020bb0576cf9b54a845255f.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/trace/kprobetrace.rst')
| -rw-r--r-- | Documentation/trace/kprobetrace.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index bf9cecb69fc9..a49662ccd53c 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -70,6 +70,15 @@ Synopsis of kprobe_events (\*3) this is useful for fetching a field of data structures. (\*4) "u" means user-space dereference. See :ref:`user_mem_access`. +Function arguments at kretprobe +------------------------------- +Function arguments can be accessed at kretprobe using $arg<N> fetcharg. This +is useful to record the function parameter and return value at once, and +trace the difference of structure fields (for debuging a function whether it +correctly updates the given data structure or not). +See the :ref:`sample<fprobetrace_exit_args_sample>` in fprobe event for how +it works. + .. _kprobetrace_types: Types |