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Subject[PATCH v4] perf_event_open.2: add type kprobe and uprobe
Date
Two new types kprobe and uprobe are being added to perf_event_open,
which allow creating kprobe or uprobe with perf_event_open. This
patch adds information about these types.

Signed-off-by: Song Liu <songliubraving@fb.com>
---
man2/perf_event_open.2 | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index c91da3f..7a97ed3 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -256,11 +256,15 @@ struct perf_event_attr {

union {
__u64 bp_addr; /* breakpoint address */
+ __u64 kprobe_func; /* for perf_kprobe */
+ __u64 uprobe_path; /* for perf_uprobe */
__u64 config1; /* extension of config */
};

union {
__u64 bp_len; /* breakpoint length */
+ __u64 kprobe_addr; /* with kprobe_func == NULL */
+ __u64 probe_offset; /* for perf_[k,u]probe */
__u64 config2; /* extension of config1 */
};
__u64 branch_sample_type; /* enum perf_branch_sample_type */
@@ -336,6 +340,13 @@ field.
For instance,
.I /sys/bus/event_source/devices/cpu/type
contains the value for the core CPU PMU, which is usually 4.
+.TP
+.BR kprobe " and " uprobe " (since Linux 4.TBD)"
+These two dynamic PMU creates kprobe or uprobe with perf_event_open and
+attaches it to the file descriptor.
+See fields
+.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
+for more details.
.RE
.TP
.I "size"
@@ -627,6 +638,44 @@ then leave
.I config
set to zero.
Its parameters are set in other places.
+.PP
+If
+.I type
+is
+.BR kprobe
+or
+.BR uprobe ,
+set
+.BR PERF_PROBE_CONFIG_IS_RETPROBE
+in
+.I config
+for kretprobe/uretprobe. See fields
+.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
+for more details.
+.RE
+.TP
+.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
+.EE
+These fields describes the kprobe/uprobe for dynamic PMU
+.BR kprobe
+and
+.BR uprobe .
+For
+.BR kprobe ": "
+use
+.I kprobe_func
+and
+.IR probe_offset ,
+or use
+.I kprobe_addr
+and leave
+.I kprobe_func
+as NULL. For
+.BR uprobe ": "
+use
+.I uprobe_path
+and
+.IR probe_offset .
.RE
.TP
.IR sample_period ", " sample_freq
--
2.9.5
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