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 v5 vs v4: 1. Use glob_match() instead of str_has_suffix(), so remove the first patch; 2. Allocate buffer from heap for expand dentry; 3. Support "%pd/%pD" print type for fprobe; 4. Use $arg1 instead of origin register in test case; 5. Add test case for fprobe; Diff v4 vs v3: 1. Use "argv[i][idx + 3] == 'd'" instead of "argv[i][strlen(argv[i]) - 1] == 'd'" to judge print format in PATCH[4/7]; Diff v3 vs v2: 1. Return the index of where the suffix was found in str_has_suffix(); 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 (8): 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/probes: support '%pd/%pD' type for fprobe tracing: add new type "%pd/%pD" in readme_msg[] Documentation: tracing: add new type '%pd' and '%pD' for kprobe selftests/ftrace: add kprobe test cases for VFS type "%pd" and "%pD" selftests/ftrace: add fprobe test cases for VFS type "%pd" and "%pD" Documentation/trace/kprobetrace.rst | 8 ++- kernel/trace/trace.c | 2 +- kernel/trace/trace_fprobe.c | 6 ++ kernel/trace/trace_kprobe.c | 6 ++ kernel/trace/trace_probe.c | 63 +++++++++++++++++++ kernel/trace/trace_probe.h | 2 + .../ftrace/test.d/dynevent/fprobe_args_vfs.tc | 40 ++++++++++++ .../ftrace/test.d/kprobe/kprobe_args_vfs.tc | 43 +++++++++++++ 8 files changed, 167 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/fprobe_args_vfs.tc create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_vfs.tc -- 2.31.1