linux-kernel - [PATCH v3 6/7] Documentation: tracing: add new type '%pd' and '%pD' for kprobe

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Message-ID: <20240123025608.2370978-7-yebin10@huawei.com>
Date: Tue, 23 Jan 2024 10:56:07 +0800
From: Ye Bin <yebin10@...wei.com>
To: <rostedt@...dmis.org>, <mhiramat@...nel.org>,
	<mathieu.desnoyers@...icios.com>, <linux-trace-kernel@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <yebin10@...wei.com>
Subject: [PATCH v3 6/7] Documentation: tracing: add new type '%pd' and '%pD' for kprobe

Similar to printk() '%pd' is for fetch dentry's name from struct dentry's
pointer, and '%pD' is for fetch file's name from struct file's pointer.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 Documentation/trace/kprobetrace.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst
index bf9cecb69fc9..a1d12d65a8dc 100644
--- a/Documentation/trace/kprobetrace.rst
+++ b/Documentation/trace/kprobetrace.rst
@@ -58,7 +58,8 @@ Synopsis of kprobe_events
   NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
   FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
 		  (u8/u16/u32/u64/s8/s16/s32/s64), hexadecimal types
-		  (x8/x16/x32/x64), "char", "string", "ustring", "symbol", "symstr"
+		  (x8/x16/x32/x64), VFS layer common type(%pd/%pD) for print
+                  file name, "char", "string", "ustring", "symbol", "symstr"
                   and bitfield are supported.
 
   (\*1) only for the probe on function entry (offs == 0). Note, this argument access
@@ -113,6 +114,9 @@ With 'symstr' type, you can filter the event with wildcard pattern of the
 symbols, and you don't need to solve symbol name by yourself.
 For $comm, the default type is "string"; any other type is invalid.
 
+VFS layer common type(%pd/%pD) is a special type, which fetches dentry's or
+file's name from struct dentry's pointer or struct file's pointer.
+
 .. _user_mem_access:
 
 User Memory Access
-- 
2.31.1