| Message ID | 20240123092139.3698375-7-yebin10@huawei.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | support '%pd' and '%pD' for print file name | expand |
On Tue, 23 Jan 2024 17:21:38 +0800 Ye Bin <yebin10@huawei.com> wrote: > 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@huawei.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" Could you remove the "for print file name" here? Since this is not the place where such precise information describes. I think following hunk is enough to explain it. Thank you, > 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 > >
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
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@huawei.com> --- Documentation/trace/kprobetrace.rst | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)