linux-kernel - [PATCH v5] perf_event_open.2: add type kprobe and uprobe

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Message-ID: <20171206224518.3598254-3-songliubraving@fb.com>
Date:   Wed, 6 Dec 2017 14:45:12 -0800
From:   Song Liu <songliubraving@...com>
To:     <peterz@...radead.org>, <rostedt@...dmis.org>, <mingo@...hat.com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <daniel@...earbox.net>
CC:     <kernel-team@...com>, Song Liu <songliubraving@...com>
Subject: [PATCH v5] perf_event_open.2: add type kprobe and uprobe

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@...com>
---
 man2/perf_event_open.2 | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index c91da3f..02d6673 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 +638,45 @@ 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
+.IR retprobe
+(bit 0 of
+.IR config ,
+see /sys/bus/event_source/devices/[k,u]probe/format/retprobe)
+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