During fault locating, the file name needs to be printed based on the
dentry/file address. The offset needs to be calculated each time, which
is troublesome. Similar to printk, kprobe supports printing file names
for dentry/file addresses.
Diff v2 vs v1:
1. Use "%pd/%pD" print format instead of "pd/pD" print format;
2. Add "%pd/%pD" in README;
3. Expand "%pd/%pD" argument before parameter parsing;
4. Add more detail information in ftrace documentation;
5. Add test cases for new print format in selftests/ftrace;
Ye Bin (7):
string.h: add str_has_suffix() helper for test string ends with
specify string
tracing/probes: add traceprobe_expand_dentry_args() helper
tracing/probes: support '%pd' type for print struct dentry's name
tracing/probes: support '%pD' type for print struct file's name
tracing: add new type "%pd/%pD" in readme_msg[]
Documentation: tracing: add new type '%pd' and '%pD' for kprobe
selftests/ftrace: add test cases for VFS type "%pd" and "%pD"
Documentation/trace/kprobetrace.rst | 6 +-
include/linux/string.h | 20 +++++
kernel/trace/trace.c | 2 +-
kernel/trace/trace_kprobe.c | 6 ++
kernel/trace/trace_probe.c | 45 +++++++++++
kernel/trace/trace_probe.h | 3 +
.../ftrace/test.d/kprobe/kprobe_args_vfs.tc | 79 +++++++++++++++++++
7 files changed, 159 insertions(+), 2 deletions(-)
create mode 100644
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_vfs.tc
--
2.31.1
