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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-05 14:04:19 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-05 14:04:19 -0400 |
commit | 714f83d5d9f7c785f622259dad1f4fad12d64664 (patch) | |
tree | 20563541ae438e11d686b4d629074eb002a481b7 /Documentation/tracepoints.txt | |
parent | 8901e7ffc2fa78ede7ce9826dbad68a3a25dc2dc (diff) | |
parent | 645dae969c3b8651c5bc7c54a1835ec03820f85f (diff) |
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (413 commits)
tracing, net: fix net tree and tracing tree merge interaction
tracing, powerpc: fix powerpc tree and tracing tree interaction
ring-buffer: do not remove reader page from list on ring buffer free
function-graph: allow unregistering twice
trace: make argument 'mem' of trace_seq_putmem() const
tracing: add missing 'extern' keywords to trace_output.h
tracing: provide trace_seq_reserve()
blktrace: print out BLK_TN_MESSAGE properly
blktrace: extract duplidate code
blktrace: fix memory leak when freeing struct blk_io_trace
blktrace: fix blk_probes_ref chaos
blktrace: make classic output more classic
blktrace: fix off-by-one bug
blktrace: fix the original blktrace
blktrace: fix a race when creating blk_tree_root in debugfs
blktrace: fix timestamp in binary output
tracing, Text Edit Lock: cleanup
tracing: filter fix for TRACE_EVENT_FORMAT events
ftrace: Using FTRACE_WARN_ON() to check "freed record" in ftrace_release()
x86: kretprobe-booster interrupt emulation code fix
...
Fix up trivial conflicts in
arch/parisc/include/asm/ftrace.h
include/linux/memory.h
kernel/extable.c
kernel/module.c
Diffstat (limited to 'Documentation/tracepoints.txt')
-rw-r--r-- | Documentation/tracepoints.txt | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/Documentation/tracepoints.txt b/Documentation/tracepoints.txt index 6f0a044f5b5e..c0e1ceed75a4 100644 --- a/Documentation/tracepoints.txt +++ b/Documentation/tracepoints.txt | |||
@@ -45,8 +45,8 @@ In include/trace/subsys.h : | |||
45 | #include <linux/tracepoint.h> | 45 | #include <linux/tracepoint.h> |
46 | 46 | ||
47 | DECLARE_TRACE(subsys_eventname, | 47 | DECLARE_TRACE(subsys_eventname, |
48 | TPPROTO(int firstarg, struct task_struct *p), | 48 | TP_PROTO(int firstarg, struct task_struct *p), |
49 | TPARGS(firstarg, p)); | 49 | TP_ARGS(firstarg, p)); |
50 | 50 | ||
51 | In subsys/file.c (where the tracing statement must be added) : | 51 | In subsys/file.c (where the tracing statement must be added) : |
52 | 52 | ||
@@ -66,10 +66,10 @@ Where : | |||
66 | - subsys is the name of your subsystem. | 66 | - subsys is the name of your subsystem. |
67 | - eventname is the name of the event to trace. | 67 | - eventname is the name of the event to trace. |
68 | 68 | ||
69 | - TPPROTO(int firstarg, struct task_struct *p) is the prototype of the | 69 | - TP_PROTO(int firstarg, struct task_struct *p) is the prototype of the |
70 | function called by this tracepoint. | 70 | function called by this tracepoint. |
71 | 71 | ||
72 | - TPARGS(firstarg, p) are the parameters names, same as found in the | 72 | - TP_ARGS(firstarg, p) are the parameters names, same as found in the |
73 | prototype. | 73 | prototype. |
74 | 74 | ||
75 | Connecting a function (probe) to a tracepoint is done by providing a | 75 | Connecting a function (probe) to a tracepoint is done by providing a |
@@ -103,13 +103,14 @@ used to export the defined tracepoints. | |||
103 | 103 | ||
104 | * Probe / tracepoint example | 104 | * Probe / tracepoint example |
105 | 105 | ||
106 | See the example provided in samples/tracepoints/src | 106 | See the example provided in samples/tracepoints |
107 | 107 | ||
108 | Compile them with your kernel. | 108 | Compile them with your kernel. They are built during 'make' (not |
109 | 'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m. | ||
109 | 110 | ||
110 | Run, as root : | 111 | Run, as root : |
111 | modprobe tracepoint-example (insmod order is not important) | 112 | modprobe tracepoint-sample (insmod order is not important) |
112 | modprobe tracepoint-probe-example | 113 | modprobe tracepoint-probe-sample |
113 | cat /proc/tracepoint-example (returns an expected error) | 114 | cat /proc/tracepoint-sample (returns an expected error) |
114 | rmmod tracepoint-example tracepoint-probe-example | 115 | rmmod tracepoint-sample tracepoint-probe-sample |
115 | dmesg | 116 | dmesg |