Introduction
============
This document describes how to use the dynamic debug (ddebug) feature.
Dynamic debug is designed to allow you to dynamically enable/disable kernel
code to obtain additional kernel information. Currently, if
CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_debug() calls can be
dynamically enabled per-callsite.
Dynamic debug has even more useful features:
&* Simple query language allows turning on and off debugging statements by
&& matching any combination of:
&& - source filename
&& - function name
&& - line number (including ranges of line numbers)
&& - module name
&& - format string
&* Provides a debugfs control file: &debugfs&/dynamic_debug/control which can be
&& read to display the complete list of known debug statements, to help guide you
Controlling dynamic debug Behaviour
===============================
The behaviour of pr_debug()/dev_debug()s are controlled via writing to a
control file in the 'debugfs' filesystem. Thus, you must first mount the debugfs
filesystem, in order to make use of this feature. Subsequently, we refer to the
control file as: &debugfs&/dynamic_debug/control. For example, if you want to
enable printing from source file 'svcsock.c', line 1603 you simply do:
nullarbor:~ # echo 'file svcsock.c line 1603 +p' &
&&&&&debugfs&/dynamic_debug/control
If you make a mistake with the syntax, the write will fail thus:
nullarbor:~ # echo 'file svcsock.c wtf 1 +p' &
&&&&&debugfs&/dynamic_debug/control
-bash: echo: write error: Invalid argument
Viewing Dynamic Debug Behaviour
===========================
You can view the currently configured behaviour of all the debug statements
nullarbor:~ # cat &debugfs&/dynamic_debug/control
# filename:lineno [module]function flags format
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup - &SVCRDMA Module Removed, deregister RPC RDMA transport\012&
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init - &\011max_inline&&&&&& : %d\012&
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init - &\011sq_depth&&&&&&&& : %d\012&
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init - &\011max_requests&&&& : %d\012&
You can also apply standard Unix text manipulation filters to this
data, e.g.
nullarbor:~ # grep -i rdma &debugfs&/dynamic_debug/control& | wc -l
nullarbor:~ # grep -i tcp &debugfs&/dynamic_debug/control | wc -l
Note in particular that the third column shows the enabled behaviour
flags for each debug statement callsite (see below for definitions of the
flags).& The default value, no extra behaviour enabled, is &-&.& So
you can view all the debug statement callsites with any non-default flags:
nullarbor:~ # awk '$3 != &-&' &debugfs&/dynamic_debug/control
# filename:lineno [module]function flags format
/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p &svc_process: st_sendto returned %d\012&
Command Language Reference
==========================
At the lexical level, a command comprises a sequence of words separated
by whitespace characters.& Note that newlines are treated as word
separators and do *not* end a command or allow multiple commands to
be done together.& So these are all equivalent:
nullarbor:~ # echo -c 'file svcsock.c line 1603 +p' &
&&&&&debugfs&/dynamic_debug/control
nullarbor:~ # echo -c '& file&& svcsock.c&&&& line& 1603 +p& ' &
&&&&&debugfs&/dynamic_debug/control
nullarbor:~ # echo -c 'file svcsock.c\nline 1603 +p' &
&&&&&debugfs&/dynamic_debug/control
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' &
&&&&&debugfs&/dynamic_debug/control
Commands are bounded by a write() system call.& If you want to do
multiple commands you need to do a separate &echo& for each, like:
nullarbor:~ # echo 'file svcsock.c line 1603 +p' & /proc/\
& echo 'file svcsock.c line 1563 +p' & /proc/dprintk
or even like:
nullarbor:~ # (
& echo 'file svcsock.c line 1603 +p' ;\
& echo 'file svcsock.c line 1563 +p' ;\
& ) & /proc/dprintk
At the syntactical level, a command comprises a sequence of match
specifications, followed by a flags change specification.
command ::= match-spec* flags-spec
The match-spec's are used to choose a subset of the known dprintk()
callsites to which to apply the flags-spec.& Think of them as a query
with implicit ANDs between each pair.& Note that an empty list of
match-specs is possible, but is not very useful because it will not
match any debug statement callsites.
A match specification comprises a keyword, which controls the attribute
of the callsite to be compared, and a value to compare against.& Possible
keywords are:
match-spec ::= 'func' string |
&&&&&&& 'file' string |
&&&&&&& 'module' string |
&&&&&&& 'format' string |
&&&&&&& 'line' line-range
line-range ::= lineno |
&&&&&&& '-'lineno |
&&&&&&& lineno'-' |
&&&&&&& lineno'-'lineno
// Note: line-range cannot contain space, e.g.
// &1-30& is valid range but &1 - 30& is not.
lineno ::= unsigned-int
The meanings of each keyword are:
&&& The given string is compared against the function name
&&& of each callsite.& Example:
&&& func svc_tcp_accept
&&& The given string is compared against either the full
&&& pathname or the basename of the source file of each
&&& callsite.& Examples:
&&& file svcsock.c
&&& file /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c
&&& The given string is compared against the module name
&&& of each callsite.& The module name is the string as
&&& seen in &lsmod&, i.e. without the directory or the .ko
&&& suffix and with '-' changed to '_'.& Examples:
&&& module sunrpc
&&& module nfsd
&&& The given string is searched for in the dynamic debug format
&&& string.& Note that the string does not need to match the
&&& entire format, only some part.& Whitespace and other
&&& special characters can be escaped using C octal character
&&& escape \ooo notation, e.g. the space character is \040.
&&& Alternatively, the string can be enclosed in double quote
&&& characters (&) or single quote characters (').
&&& Examples:
&&& format svcrdma:&&&& // many of the NFS/RDMA server dprintks
&&& format readahead&&&& // some dprintks in the readahead cache
&&& format nfsd:\040SETATTR // one way to match a format with whitespace
&&& format &nfsd: SETATTR&& // a neater way to match a format with whitespace
&&& format 'nfsd: SETATTR'& // yet another way to match a format with whitespace
&&& The given line number or range of line numbers is compared
&&& against the line number of each dprintk() callsite.& A single
&&& line number matches the callsite line number exactly.& A
&&& range of line numbers matches any callsite between the first
&&& and last line number inclusive.& An empty first number means
&&& the first line in the file, an empty line number means the
&&& last number in the file.& Examples:
&&& line 1603&&&& // exactly line 1603
&&& line & // the six lines from line 1600 to line 1605
&&& line -1605&&&& // the 1605 lines from line 1 to line 1605
&&& line 1600-&&&& // all lines from line 1600 to the end of the file
The flags specification comprises a change operation followed
by one or more flag characters.& The change operation is one
of the characters:
&&& remove the given flags
&&& add the given flags
&&& set the flags to the given flags
The flags are:
&&& Causes a printk() message to be emitted to dmesg
Note the regexp ^[-+=][scp]+$ matches a flags specification.
Note also that there is no convenient syntax to remove all
the flags at once, you need to use &-psc&.
// enable the message at line 1603 of file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' &
&&&&&debugfs&/dynamic_debug/control
// enable all the messages in file svcsock.c
nullarbor:~ # echo -n 'file svcsock.c +p' &
&&&&&debugfs&/dynamic_debug/control
// enable all the messages in the NFS server module
nullarbor:~ # echo -n 'module nfsd +p' &
&&&&&debugfs&/dynamic_debug/control
// enable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process +p' &
&&&&&debugfs&/dynamic_debug/control
// disable all 12 messages in the function svc_process()
nullarbor:~ # echo -n 'func svc_process -p' &
&&&&&debugfs&/dynamic_debug/control
// enable messages for NFS calls READ, READLINK, READDIR and READDIR+.
nullarbor:~ # echo -n 'format &nfsd: READ& +p' &
&&&&&debugfs&/dynamic_debug/control
for example
adb shell &echo -n 'file svc_process.c +p' & /sys/kernel/debug/dynamic_debug/control&
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