[GIT PULL] tracing: Updates for v4.18

From: Steven Rostedt
Date: Wed Jun 06 2018 - 10:25:07 EST


Linus,

One new feature was added to ftrace, which is the trace_marker now supports
triggers. For example:

# cd /sys/kernel/debug/tracing
# echo 'snapshot' > events/ftrace/print/trigger
# echo 'cause snapshot' > trace_marker

The rest of the changes are various clean ups and also one stable fix that
was added late in the cycle.


Please pull the latest trace-v4.18 tree, which can be found at:


git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v4.18

Tag SHA1: d4b0a68285a96a2404cd5a8f36a9d228889a2bdf
Head SHA1: 591a033dc17ff6f684b6b6d1d7426e22d178194f


Andi Kleen (1):
trace: Use -mcount-record for dynamic ftrace

Lee, Chun-Yi (1):
tracepoints: Fix the descriptions of tracepoint_probe_register{_prio}

Mikulas Patocka (1):
branch-check: fix long->int truncation when profiling branches

Steven Rostedt (VMware) (16):
tracing: Do not reference event data in post call triggers
tracing: Add __find_event_file() to find event files without restrictions
tracing: Have event_trace_init() called by trace_init_tracefs()
tracing: Add brackets in ftrace event dynamic arrays
tracing: Do not show filter file for ftrace internal events
tracing: Add trigger file for trace_markers tracefs/ftrace/print
tracing: Have zero size length in filter logic be full string
tracing: Prevent further users of zero size static arrays in trace events
tracing: Allow histogram triggers to access ftrace internal events
tracing: Document trace_marker triggers
ftrace/selftest: Have the reset_trigger code be a bit more careful
ftrace/selftest: Fix reset_trigger() to handle triggers with filters
tracing/selftest: Add selftests to test trace_marker histogram triggers
tracing/selftest: Add test to test hist trigger between kernel event and trace_marker
tracing/selftest: Add test to test simple snapshot trigger for trace_marker
ring-buffer: Fix a bunch of typos in comments

Vasyl Gomonovych (1):
ring-buffer: Fix typo in comment

Yisheng Xie (1):
tracing: Use match_string() instead of open coding it in trace_set_options()

----
Documentation/trace/events.rst | 6 +-
Documentation/trace/ftrace.rst | 5 +
Documentation/trace/histogram.txt | 545 ++++++++++++++++++++-
include/linux/compiler.h | 2 +-
include/linux/ring_buffer.h | 2 +-
include/linux/trace_events.h | 3 +-
include/trace/trace_events.h | 1 +
kernel/trace/ring_buffer.c | 20 +-
kernel/trace/trace.c | 34 +-
kernel/trace/trace.h | 9 +-
kernel/trace/trace_entries.h | 6 +-
kernel/trace/trace_events.c | 36 +-
kernel/trace/trace_events_filter.c | 23 +-
kernel/trace/trace_events_hist.c | 2 +-
kernel/trace/trace_events_trigger.c | 6 +-
kernel/trace/trace_export.c | 9 +-
kernel/tracepoint.c | 3 +-
scripts/Makefile.build | 6 +
tools/testing/selftests/ftrace/test.d/functions | 23 +-
.../test.d/trigger/trigger-trace-marker-hist.tc | 49 ++
.../trigger/trigger-trace-marker-snapshot.tc | 74 +++
.../trigger-trace-marker-synthetic-kernel.tc | 68 +++
.../trigger/trigger-trace-marker-synthetic.tc | 66 +++
23 files changed, 933 insertions(+), 65 deletions(-)
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic-kernel.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic.tc
---------------------------
diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst
index a5ea2cb0082b..1afae55dc55c 100644
--- a/Documentation/trace/events.rst
+++ b/Documentation/trace/events.rst
@@ -338,10 +338,14 @@ used for conditionally invoking triggers.

The syntax for event triggers is roughly based on the syntax for
set_ftrace_filter 'ftrace filter commands' (see the 'Filter commands'
-section of Documentation/trace/ftrace.txt), but there are major
+section of Documentation/trace/ftrace.rst), but there are major
differences and the implementation isn't currently tied to it in any
way, so beware about making generalizations between the two.

+Note: Writing into trace_marker (See Documentation/trace/ftrace.rst)
+ can also enable triggers that are written into
+ /sys/kernel/tracing/events/ftrace/print/trigger
+
6.1 Expression syntax
---------------------

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 67d9c38e95eb..aad4776c0f5d 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -507,6 +507,11 @@ of ftrace. Here is a list of some of the key files:

trace_fd = open("trace_marker", WR_ONLY);

+ Note: Writing into the trace_marker file can also initiate triggers
+ that are written into /sys/kernel/tracing/events/ftrace/print/trigger
+ See "Event triggers" in Documentation/trace/events.rst and an
+ example in Documentation/trace/histogram.rst (Section 3.)
+
trace_marker_raw:

This is similar to trace_marker above, but is meant for for binary data
diff --git a/Documentation/trace/histogram.txt b/Documentation/trace/histogram.txt
index 6e05510afc28..b13771cb12c1 100644
--- a/Documentation/trace/histogram.txt
+++ b/Documentation/trace/histogram.txt
@@ -1604,7 +1604,6 @@
Entries: 7
Dropped: 0

-
2.2 Inter-event hist triggers
-----------------------------

@@ -1993,3 +1992,547 @@ hist trigger specification.
Hits: 12970
Entries: 2
Dropped: 0
+
+3. User space creating a trigger
+--------------------------------
+
+Writing into /sys/kernel/tracing/trace_marker writes into the ftrace
+ring buffer. This can also act like an event, by writing into the trigger
+file located in /sys/kernel/tracing/events/ftrace/print/
+
+Modifying cyclictest to write into the trace_marker file before it sleeps
+and after it wakes up, something like this:
+
+static void traceputs(char *str)
+{
+ /* tracemark_fd is the trace_marker file descriptor */
+ if (tracemark_fd < 0)
+ return;
+ /* write the tracemark message */
+ write(tracemark_fd, str, strlen(str));
+}
+
+And later add something like:
+
+ traceputs("start");
+ clock_nanosleep(...);
+ traceputs("end");
+
+We can make a histogram from this:
+
+ # cd /sys/kernel/tracing
+ # echo 'latency u64 lat' > synthetic_events
+ # echo 'hist:keys=common_pid:ts0=common_timestamp.usecs if buf == "start"' > events/ftrace/print/trigger
+ # echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(ftrace.print).latency($lat) if buf == "end"' >> events/ftrace/print/trigger
+ # echo 'hist:keys=lat,common_pid:sort=lat' > events/synthetic/latency/trigger
+
+The above created a synthetic event called "latency" and two histograms
+against the trace_marker, one gets triggered when "start" is written into the
+trace_marker file and the other when "end" is written. If the pids match, then
+it will call the "latency" synthetic event with the calculated latency as its
+parameter. Finally, a histogram is added to the latency synthetic event to
+record the calculated latency along with the pid.
+
+Now running cyclictest with:
+
+ # ./cyclictest -p80 -d0 -i250 -n -a -t --tracemark -b 1000
+
+ -p80 : run threads at priority 80
+ -d0 : have all threads run at the same interval
+ -i250 : start the interval at 250 microseconds (all threads will do this)
+ -n : sleep with nanosleep
+ -a : affine all threads to a separate CPU
+ -t : one thread per available CPU
+ --tracemark : enable trace mark writing
+ -b 1000 : stop if any latency is greater than 1000 microseconds
+
+Note, the -b 1000 is used just to make --tracemark available.
+
+Then we can see the histogram created by this with:
+
+ # cat events/synthetic/latency/hist
+# event histogram
+#
+# trigger info: hist:keys=lat,common_pid:vals=hitcount:sort=lat:size=2048 [active]
+#
+
+{ lat: 107, common_pid: 2039 } hitcount: 1
+{ lat: 122, common_pid: 2041 } hitcount: 1
+{ lat: 166, common_pid: 2039 } hitcount: 1
+{ lat: 174, common_pid: 2039 } hitcount: 1
+{ lat: 194, common_pid: 2041 } hitcount: 1
+{ lat: 196, common_pid: 2036 } hitcount: 1
+{ lat: 197, common_pid: 2038 } hitcount: 1
+{ lat: 198, common_pid: 2039 } hitcount: 1
+{ lat: 199, common_pid: 2039 } hitcount: 1
+{ lat: 200, common_pid: 2041 } hitcount: 1
+{ lat: 201, common_pid: 2039 } hitcount: 2
+{ lat: 202, common_pid: 2038 } hitcount: 1
+{ lat: 202, common_pid: 2043 } hitcount: 1
+{ lat: 203, common_pid: 2039 } hitcount: 1
+{ lat: 203, common_pid: 2036 } hitcount: 1
+{ lat: 203, common_pid: 2041 } hitcount: 1
+{ lat: 206, common_pid: 2038 } hitcount: 2
+{ lat: 207, common_pid: 2039 } hitcount: 1
+{ lat: 207, common_pid: 2036 } hitcount: 1
+{ lat: 208, common_pid: 2040 } hitcount: 1
+{ lat: 209, common_pid: 2043 } hitcount: 1
+{ lat: 210, common_pid: 2039 } hitcount: 1
+{ lat: 211, common_pid: 2039 } hitcount: 4
+{ lat: 212, common_pid: 2043 } hitcount: 1
+{ lat: 212, common_pid: 2039 } hitcount: 2
+{ lat: 213, common_pid: 2039 } hitcount: 1
+{ lat: 214, common_pid: 2038 } hitcount: 1
+{ lat: 214, common_pid: 2039 } hitcount: 2
+{ lat: 214, common_pid: 2042 } hitcount: 1
+{ lat: 215, common_pid: 2039 } hitcount: 1
+{ lat: 217, common_pid: 2036 } hitcount: 1
+{ lat: 217, common_pid: 2040 } hitcount: 1
+{ lat: 217, common_pid: 2039 } hitcount: 1
+{ lat: 218, common_pid: 2039 } hitcount: 6
+{ lat: 219, common_pid: 2039 } hitcount: 9
+{ lat: 220, common_pid: 2039 } hitcount: 11
+{ lat: 221, common_pid: 2039 } hitcount: 5
+{ lat: 221, common_pid: 2042 } hitcount: 1
+{ lat: 222, common_pid: 2039 } hitcount: 7
+{ lat: 223, common_pid: 2036 } hitcount: 1
+{ lat: 223, common_pid: 2039 } hitcount: 3
+{ lat: 224, common_pid: 2039 } hitcount: 4
+{ lat: 224, common_pid: 2037 } hitcount: 1
+{ lat: 224, common_pid: 2036 } hitcount: 2
+{ lat: 225, common_pid: 2039 } hitcount: 5
+{ lat: 225, common_pid: 2042 } hitcount: 1
+{ lat: 226, common_pid: 2039 } hitcount: 7
+{ lat: 226, common_pid: 2036 } hitcount: 4
+{ lat: 227, common_pid: 2039 } hitcount: 6
+{ lat: 227, common_pid: 2036 } hitcount: 12
+{ lat: 227, common_pid: 2043 } hitcount: 1
+{ lat: 228, common_pid: 2039 } hitcount: 7
+{ lat: 228, common_pid: 2036 } hitcount: 14
+{ lat: 229, common_pid: 2039 } hitcount: 9
+{ lat: 229, common_pid: 2036 } hitcount: 8
+{ lat: 229, common_pid: 2038 } hitcount: 1
+{ lat: 230, common_pid: 2039 } hitcount: 11
+{ lat: 230, common_pid: 2036 } hitcount: 6
+{ lat: 230, common_pid: 2043 } hitcount: 1
+{ lat: 230, common_pid: 2042 } hitcount: 2
+{ lat: 231, common_pid: 2041 } hitcount: 1
+{ lat: 231, common_pid: 2036 } hitcount: 6
+{ lat: 231, common_pid: 2043 } hitcount: 1
+{ lat: 231, common_pid: 2039 } hitcount: 8
+{ lat: 232, common_pid: 2037 } hitcount: 1
+{ lat: 232, common_pid: 2039 } hitcount: 6
+{ lat: 232, common_pid: 2040 } hitcount: 2
+{ lat: 232, common_pid: 2036 } hitcount: 5
+{ lat: 232, common_pid: 2043 } hitcount: 1
+{ lat: 233, common_pid: 2036 } hitcount: 5
+{ lat: 233, common_pid: 2039 } hitcount: 11
+{ lat: 234, common_pid: 2039 } hitcount: 4
+{ lat: 234, common_pid: 2038 } hitcount: 2
+{ lat: 234, common_pid: 2043 } hitcount: 2
+{ lat: 234, common_pid: 2036 } hitcount: 11
+{ lat: 234, common_pid: 2040 } hitcount: 1
+{ lat: 235, common_pid: 2037 } hitcount: 2
+{ lat: 235, common_pid: 2036 } hitcount: 8
+{ lat: 235, common_pid: 2043 } hitcount: 2
+{ lat: 235, common_pid: 2039 } hitcount: 5
+{ lat: 235, common_pid: 2042 } hitcount: 2
+{ lat: 235, common_pid: 2040 } hitcount: 4
+{ lat: 235, common_pid: 2041 } hitcount: 1
+{ lat: 236, common_pid: 2036 } hitcount: 7
+{ lat: 236, common_pid: 2037 } hitcount: 1
+{ lat: 236, common_pid: 2041 } hitcount: 5
+{ lat: 236, common_pid: 2039 } hitcount: 3
+{ lat: 236, common_pid: 2043 } hitcount: 9
+{ lat: 236, common_pid: 2040 } hitcount: 7
+{ lat: 237, common_pid: 2037 } hitcount: 1
+{ lat: 237, common_pid: 2040 } hitcount: 1
+{ lat: 237, common_pid: 2036 } hitcount: 9
+{ lat: 237, common_pid: 2039 } hitcount: 3
+{ lat: 237, common_pid: 2043 } hitcount: 8
+{ lat: 237, common_pid: 2042 } hitcount: 2
+{ lat: 237, common_pid: 2041 } hitcount: 2
+{ lat: 238, common_pid: 2043 } hitcount: 10
+{ lat: 238, common_pid: 2040 } hitcount: 1
+{ lat: 238, common_pid: 2037 } hitcount: 9
+{ lat: 238, common_pid: 2038 } hitcount: 1
+{ lat: 238, common_pid: 2039 } hitcount: 1
+{ lat: 238, common_pid: 2042 } hitcount: 3
+{ lat: 238, common_pid: 2036 } hitcount: 7
+{ lat: 239, common_pid: 2041 } hitcount: 1
+{ lat: 239, common_pid: 2043 } hitcount: 11
+{ lat: 239, common_pid: 2037 } hitcount: 11
+{ lat: 239, common_pid: 2038 } hitcount: 6
+{ lat: 239, common_pid: 2036 } hitcount: 7
+{ lat: 239, common_pid: 2040 } hitcount: 1
+{ lat: 239, common_pid: 2042 } hitcount: 9
+{ lat: 240, common_pid: 2037 } hitcount: 29
+{ lat: 240, common_pid: 2043 } hitcount: 15
+{ lat: 240, common_pid: 2040 } hitcount: 44
+{ lat: 240, common_pid: 2039 } hitcount: 1
+{ lat: 240, common_pid: 2041 } hitcount: 2
+{ lat: 240, common_pid: 2038 } hitcount: 1
+{ lat: 240, common_pid: 2036 } hitcount: 10
+{ lat: 240, common_pid: 2042 } hitcount: 13
+{ lat: 241, common_pid: 2036 } hitcount: 21
+{ lat: 241, common_pid: 2041 } hitcount: 36
+{ lat: 241, common_pid: 2037 } hitcount: 34
+{ lat: 241, common_pid: 2042 } hitcount: 14
+{ lat: 241, common_pid: 2040 } hitcount: 94
+{ lat: 241, common_pid: 2039 } hitcount: 12
+{ lat: 241, common_pid: 2038 } hitcount: 2
+{ lat: 241, common_pid: 2043 } hitcount: 28
+{ lat: 242, common_pid: 2040 } hitcount: 109
+{ lat: 242, common_pid: 2041 } hitcount: 506
+{ lat: 242, common_pid: 2039 } hitcount: 155
+{ lat: 242, common_pid: 2042 } hitcount: 21
+{ lat: 242, common_pid: 2037 } hitcount: 52
+{ lat: 242, common_pid: 2043 } hitcount: 21
+{ lat: 242, common_pid: 2036 } hitcount: 16
+{ lat: 242, common_pid: 2038 } hitcount: 156
+{ lat: 243, common_pid: 2037 } hitcount: 46
+{ lat: 243, common_pid: 2039 } hitcount: 40
+{ lat: 243, common_pid: 2042 } hitcount: 119
+{ lat: 243, common_pid: 2041 } hitcount: 611
+{ lat: 243, common_pid: 2036 } hitcount: 69
+{ lat: 243, common_pid: 2038 } hitcount: 784
+{ lat: 243, common_pid: 2040 } hitcount: 323
+{ lat: 243, common_pid: 2043 } hitcount: 14
+{ lat: 244, common_pid: 2043 } hitcount: 35
+{ lat: 244, common_pid: 2042 } hitcount: 305
+{ lat: 244, common_pid: 2039 } hitcount: 8
+{ lat: 244, common_pid: 2040 } hitcount: 4515
+{ lat: 244, common_pid: 2038 } hitcount: 371
+{ lat: 244, common_pid: 2037 } hitcount: 31
+{ lat: 244, common_pid: 2036 } hitcount: 114
+{ lat: 244, common_pid: 2041 } hitcount: 3396
+{ lat: 245, common_pid: 2036 } hitcount: 700
+{ lat: 245, common_pid: 2041 } hitcount: 2772
+{ lat: 245, common_pid: 2037 } hitcount: 268
+{ lat: 245, common_pid: 2039 } hitcount: 472
+{ lat: 245, common_pid: 2038 } hitcount: 2758
+{ lat: 245, common_pid: 2042 } hitcount: 3833
+{ lat: 245, common_pid: 2040 } hitcount: 3105
+{ lat: 245, common_pid: 2043 } hitcount: 645
+{ lat: 246, common_pid: 2038 } hitcount: 3451
+{ lat: 246, common_pid: 2041 } hitcount: 142
+{ lat: 246, common_pid: 2037 } hitcount: 5101
+{ lat: 246, common_pid: 2040 } hitcount: 68
+{ lat: 246, common_pid: 2043 } hitcount: 5099
+{ lat: 246, common_pid: 2039 } hitcount: 5608
+{ lat: 246, common_pid: 2042 } hitcount: 3723
+{ lat: 246, common_pid: 2036 } hitcount: 4738
+{ lat: 247, common_pid: 2042 } hitcount: 312
+{ lat: 247, common_pid: 2043 } hitcount: 2385
+{ lat: 247, common_pid: 2041 } hitcount: 452
+{ lat: 247, common_pid: 2038 } hitcount: 792
+{ lat: 247, common_pid: 2040 } hitcount: 78
+{ lat: 247, common_pid: 2036 } hitcount: 2375
+{ lat: 247, common_pid: 2039 } hitcount: 1834
+{ lat: 247, common_pid: 2037 } hitcount: 2655
+{ lat: 248, common_pid: 2037 } hitcount: 36
+{ lat: 248, common_pid: 2042 } hitcount: 11
+{ lat: 248, common_pid: 2038 } hitcount: 122
+{ lat: 248, common_pid: 2036 } hitcount: 135
+{ lat: 248, common_pid: 2039 } hitcount: 26
+{ lat: 248, common_pid: 2041 } hitcount: 503
+{ lat: 248, common_pid: 2043 } hitcount: 66
+{ lat: 248, common_pid: 2040 } hitcount: 46
+{ lat: 249, common_pid: 2037 } hitcount: 29
+{ lat: 249, common_pid: 2038 } hitcount: 1
+{ lat: 249, common_pid: 2043 } hitcount: 29
+{ lat: 249, common_pid: 2039 } hitcount: 8
+{ lat: 249, common_pid: 2042 } hitcount: 56
+{ lat: 249, common_pid: 2040 } hitcount: 27
+{ lat: 249, common_pid: 2041 } hitcount: 11
+{ lat: 249, common_pid: 2036 } hitcount: 27
+{ lat: 250, common_pid: 2038 } hitcount: 1
+{ lat: 250, common_pid: 2036 } hitcount: 30
+{ lat: 250, common_pid: 2040 } hitcount: 19
+{ lat: 250, common_pid: 2043 } hitcount: 22
+{ lat: 250, common_pid: 2042 } hitcount: 20
+{ lat: 250, common_pid: 2041 } hitcount: 1
+{ lat: 250, common_pid: 2039 } hitcount: 6
+{ lat: 250, common_pid: 2037 } hitcount: 48
+{ lat: 251, common_pid: 2037 } hitcount: 43
+{ lat: 251, common_pid: 2039 } hitcount: 1
+{ lat: 251, common_pid: 2036 } hitcount: 12
+{ lat: 251, common_pid: 2042 } hitcount: 2
+{ lat: 251, common_pid: 2041 } hitcount: 1
+{ lat: 251, common_pid: 2043 } hitcount: 15
+{ lat: 251, common_pid: 2040 } hitcount: 3
+{ lat: 252, common_pid: 2040 } hitcount: 1
+{ lat: 252, common_pid: 2036 } hitcount: 12
+{ lat: 252, common_pid: 2037 } hitcount: 21
+{ lat: 252, common_pid: 2043 } hitcount: 14
+{ lat: 253, common_pid: 2037 } hitcount: 21
+{ lat: 253, common_pid: 2039 } hitcount: 2
+{ lat: 253, common_pid: 2036 } hitcount: 9
+{ lat: 253, common_pid: 2043 } hitcount: 6
+{ lat: 253, common_pid: 2040 } hitcount: 1
+{ lat: 254, common_pid: 2036 } hitcount: 8
+{ lat: 254, common_pid: 2043 } hitcount: 3
+{ lat: 254, common_pid: 2041 } hitcount: 1
+{ lat: 254, common_pid: 2042 } hitcount: 1
+{ lat: 254, common_pid: 2039 } hitcount: 1
+{ lat: 254, common_pid: 2037 } hitcount: 12
+{ lat: 255, common_pid: 2043 } hitcount: 1
+{ lat: 255, common_pid: 2037 } hitcount: 2
+{ lat: 255, common_pid: 2036 } hitcount: 2
+{ lat: 255, common_pid: 2039 } hitcount: 8
+{ lat: 256, common_pid: 2043 } hitcount: 1
+{ lat: 256, common_pid: 2036 } hitcount: 4
+{ lat: 256, common_pid: 2039 } hitcount: 6
+{ lat: 257, common_pid: 2039 } hitcount: 5
+{ lat: 257, common_pid: 2036 } hitcount: 4
+{ lat: 258, common_pid: 2039 } hitcount: 5
+{ lat: 258, common_pid: 2036 } hitcount: 2
+{ lat: 259, common_pid: 2036 } hitcount: 7
+{ lat: 259, common_pid: 2039 } hitcount: 7
+{ lat: 260, common_pid: 2036 } hitcount: 8
+{ lat: 260, common_pid: 2039 } hitcount: 6
+{ lat: 261, common_pid: 2036 } hitcount: 5
+{ lat: 261, common_pid: 2039 } hitcount: 7
+{ lat: 262, common_pid: 2039 } hitcount: 5
+{ lat: 262, common_pid: 2036 } hitcount: 5
+{ lat: 263, common_pid: 2039 } hitcount: 7
+{ lat: 263, common_pid: 2036 } hitcount: 7
+{ lat: 264, common_pid: 2039 } hitcount: 9
+{ lat: 264, common_pid: 2036 } hitcount: 9
+{ lat: 265, common_pid: 2036 } hitcount: 5
+{ lat: 265, common_pid: 2039 } hitcount: 1
+{ lat: 266, common_pid: 2036 } hitcount: 1
+{ lat: 266, common_pid: 2039 } hitcount: 3
+{ lat: 267, common_pid: 2036 } hitcount: 1
+{ lat: 267, common_pid: 2039 } hitcount: 3
+{ lat: 268, common_pid: 2036 } hitcount: 1
+{ lat: 268, common_pid: 2039 } hitcount: 6
+{ lat: 269, common_pid: 2036 } hitcount: 1
+{ lat: 269, common_pid: 2043 } hitcount: 1
+{ lat: 269, common_pid: 2039 } hitcount: 2
+{ lat: 270, common_pid: 2040 } hitcount: 1
+{ lat: 270, common_pid: 2039 } hitcount: 6
+{ lat: 271, common_pid: 2041 } hitcount: 1
+{ lat: 271, common_pid: 2039 } hitcount: 5
+{ lat: 272, common_pid: 2039 } hitcount: 10
+{ lat: 273, common_pid: 2039 } hitcount: 8
+{ lat: 274, common_pid: 2039 } hitcount: 2
+{ lat: 275, common_pid: 2039 } hitcount: 1
+{ lat: 276, common_pid: 2039 } hitcount: 2
+{ lat: 276, common_pid: 2037 } hitcount: 1
+{ lat: 276, common_pid: 2038 } hitcount: 1
+{ lat: 277, common_pid: 2039 } hitcount: 1
+{ lat: 277, common_pid: 2042 } hitcount: 1
+{ lat: 278, common_pid: 2039 } hitcount: 1
+{ lat: 279, common_pid: 2039 } hitcount: 4
+{ lat: 279, common_pid: 2043 } hitcount: 1
+{ lat: 280, common_pid: 2039 } hitcount: 3
+{ lat: 283, common_pid: 2036 } hitcount: 2
+{ lat: 284, common_pid: 2039 } hitcount: 1
+{ lat: 284, common_pid: 2043 } hitcount: 1
+{ lat: 288, common_pid: 2039 } hitcount: 1
+{ lat: 289, common_pid: 2039 } hitcount: 1
+{ lat: 300, common_pid: 2039 } hitcount: 1
+{ lat: 384, common_pid: 2039 } hitcount: 1
+
+Totals:
+ Hits: 67625
+ Entries: 278
+ Dropped: 0
+
+Note, the writes are around the sleep, so ideally they will all be of 250
+microseconds. If you are wondering how there are several that are under
+250 microseconds, that is because the way cyclictest works, is if one
+iteration comes in late, the next one will set the timer to wake up less that
+250. That is, if an iteration came in 50 microseconds late, the next wake up
+will be at 200 microseconds.
+
+But this could easily be done in userspace. To make this even more
+interesting, we can mix the histogram between events that happened in the
+kernel with trace_marker.
+
+ # cd /sys/kernel/tracing
+ # echo 'latency u64 lat' > synthetic_events
+ # echo 'hist:keys=pid:ts0=common_timestamp.usecs' > events/sched/sched_waking/trigger
+ # echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).latency($lat) if buf == "end"' > events/ftrace/print/trigger
+ # echo 'hist:keys=lat,common_pid:sort=lat' > events/synthetic/latency/trigger
+
+The difference this time is that instead of using the trace_marker to start
+the latency, the sched_waking event is used, matching the common_pid for the
+trace_marker write with the pid that is being woken by sched_waking.
+
+After running cyclictest again with the same parameters, we now have:
+
+ # cat events/synthetic/latency/hist
+# event histogram
+#
+# trigger info: hist:keys=lat,common_pid:vals=hitcount:sort=lat:size=2048 [active]
+#
+
+{ lat: 7, common_pid: 2302 } hitcount: 640
+{ lat: 7, common_pid: 2299 } hitcount: 42
+{ lat: 7, common_pid: 2303 } hitcount: 18
+{ lat: 7, common_pid: 2305 } hitcount: 166
+{ lat: 7, common_pid: 2306 } hitcount: 1
+{ lat: 7, common_pid: 2301 } hitcount: 91
+{ lat: 7, common_pid: 2300 } hitcount: 17
+{ lat: 8, common_pid: 2303 } hitcount: 8296
+{ lat: 8, common_pid: 2304 } hitcount: 6864
+{ lat: 8, common_pid: 2305 } hitcount: 9464
+{ lat: 8, common_pid: 2301 } hitcount: 9213
+{ lat: 8, common_pid: 2306 } hitcount: 6246
+{ lat: 8, common_pid: 2302 } hitcount: 8797
+{ lat: 8, common_pid: 2299 } hitcount: 8771
+{ lat: 8, common_pid: 2300 } hitcount: 8119
+{ lat: 9, common_pid: 2305 } hitcount: 1519
+{ lat: 9, common_pid: 2299 } hitcount: 2346
+{ lat: 9, common_pid: 2303 } hitcount: 2841
+{ lat: 9, common_pid: 2301 } hitcount: 1846
+{ lat: 9, common_pid: 2304 } hitcount: 3861
+{ lat: 9, common_pid: 2302 } hitcount: 1210
+{ lat: 9, common_pid: 2300 } hitcount: 2762
+{ lat: 9, common_pid: 2306 } hitcount: 4247
+{ lat: 10, common_pid: 2299 } hitcount: 16
+{ lat: 10, common_pid: 2306 } hitcount: 333
+{ lat: 10, common_pid: 2303 } hitcount: 16
+{ lat: 10, common_pid: 2304 } hitcount: 168
+{ lat: 10, common_pid: 2302 } hitcount: 240
+{ lat: 10, common_pid: 2301 } hitcount: 28
+{ lat: 10, common_pid: 2300 } hitcount: 95
+{ lat: 10, common_pid: 2305 } hitcount: 18
+{ lat: 11, common_pid: 2303 } hitcount: 5
+{ lat: 11, common_pid: 2305 } hitcount: 8
+{ lat: 11, common_pid: 2306 } hitcount: 221
+{ lat: 11, common_pid: 2302 } hitcount: 76
+{ lat: 11, common_pid: 2304 } hitcount: 26
+{ lat: 11, common_pid: 2300 } hitcount: 125
+{ lat: 11, common_pid: 2299 } hitcount: 2
+{ lat: 12, common_pid: 2305 } hitcount: 3
+{ lat: 12, common_pid: 2300 } hitcount: 6
+{ lat: 12, common_pid: 2306 } hitcount: 90
+{ lat: 12, common_pid: 2302 } hitcount: 4
+{ lat: 12, common_pid: 2303 } hitcount: 1
+{ lat: 12, common_pid: 2304 } hitcount: 122
+{ lat: 13, common_pid: 2300 } hitcount: 12
+{ lat: 13, common_pid: 2301 } hitcount: 1
+{ lat: 13, common_pid: 2306 } hitcount: 32
+{ lat: 13, common_pid: 2302 } hitcount: 5
+{ lat: 13, common_pid: 2305 } hitcount: 1
+{ lat: 13, common_pid: 2303 } hitcount: 1
+{ lat: 13, common_pid: 2304 } hitcount: 61
+{ lat: 14, common_pid: 2303 } hitcount: 4
+{ lat: 14, common_pid: 2306 } hitcount: 5
+{ lat: 14, common_pid: 2305 } hitcount: 4
+{ lat: 14, common_pid: 2304 } hitcount: 62
+{ lat: 14, common_pid: 2302 } hitcount: 19
+{ lat: 14, common_pid: 2300 } hitcount: 33
+{ lat: 14, common_pid: 2299 } hitcount: 1
+{ lat: 14, common_pid: 2301 } hitcount: 4
+{ lat: 15, common_pid: 2305 } hitcount: 1
+{ lat: 15, common_pid: 2302 } hitcount: 25
+{ lat: 15, common_pid: 2300 } hitcount: 11
+{ lat: 15, common_pid: 2299 } hitcount: 5
+{ lat: 15, common_pid: 2301 } hitcount: 1
+{ lat: 15, common_pid: 2304 } hitcount: 8
+{ lat: 15, common_pid: 2303 } hitcount: 1
+{ lat: 15, common_pid: 2306 } hitcount: 6
+{ lat: 16, common_pid: 2302 } hitcount: 31
+{ lat: 16, common_pid: 2306 } hitcount: 3
+{ lat: 16, common_pid: 2300 } hitcount: 5
+{ lat: 17, common_pid: 2302 } hitcount: 6
+{ lat: 17, common_pid: 2303 } hitcount: 1
+{ lat: 18, common_pid: 2304 } hitcount: 1
+{ lat: 18, common_pid: 2302 } hitcount: 8
+{ lat: 18, common_pid: 2299 } hitcount: 1
+{ lat: 18, common_pid: 2301 } hitcount: 1
+{ lat: 19, common_pid: 2303 } hitcount: 4
+{ lat: 19, common_pid: 2304 } hitcount: 5
+{ lat: 19, common_pid: 2302 } hitcount: 4
+{ lat: 19, common_pid: 2299 } hitcount: 3
+{ lat: 19, common_pid: 2306 } hitcount: 1
+{ lat: 19, common_pid: 2300 } hitcount: 4
+{ lat: 19, common_pid: 2305 } hitcount: 5
+{ lat: 20, common_pid: 2299 } hitcount: 2
+{ lat: 20, common_pid: 2302 } hitcount: 3
+{ lat: 20, common_pid: 2305 } hitcount: 1
+{ lat: 20, common_pid: 2300 } hitcount: 2
+{ lat: 20, common_pid: 2301 } hitcount: 2
+{ lat: 20, common_pid: 2303 } hitcount: 3
+{ lat: 21, common_pid: 2305 } hitcount: 1
+{ lat: 21, common_pid: 2299 } hitcount: 5
+{ lat: 21, common_pid: 2303 } hitcount: 4
+{ lat: 21, common_pid: 2302 } hitcount: 7
+{ lat: 21, common_pid: 2300 } hitcount: 1
+{ lat: 21, common_pid: 2301 } hitcount: 5
+{ lat: 21, common_pid: 2304 } hitcount: 2
+{ lat: 22, common_pid: 2302 } hitcount: 5
+{ lat: 22, common_pid: 2303 } hitcount: 1
+{ lat: 22, common_pid: 2306 } hitcount: 3
+{ lat: 22, common_pid: 2301 } hitcount: 2
+{ lat: 22, common_pid: 2300 } hitcount: 1
+{ lat: 22, common_pid: 2299 } hitcount: 1
+{ lat: 22, common_pid: 2305 } hitcount: 1
+{ lat: 22, common_pid: 2304 } hitcount: 1
+{ lat: 23, common_pid: 2299 } hitcount: 1
+{ lat: 23, common_pid: 2306 } hitcount: 2
+{ lat: 23, common_pid: 2302 } hitcount: 6
+{ lat: 24, common_pid: 2302 } hitcount: 3
+{ lat: 24, common_pid: 2300 } hitcount: 1
+{ lat: 24, common_pid: 2306 } hitcount: 2
+{ lat: 24, common_pid: 2305 } hitcount: 1
+{ lat: 24, common_pid: 2299 } hitcount: 1
+{ lat: 25, common_pid: 2300 } hitcount: 1
+{ lat: 25, common_pid: 2302 } hitcount: 4
+{ lat: 26, common_pid: 2302 } hitcount: 2
+{ lat: 27, common_pid: 2305 } hitcount: 1
+{ lat: 27, common_pid: 2300 } hitcount: 1
+{ lat: 27, common_pid: 2302 } hitcount: 3
+{ lat: 28, common_pid: 2306 } hitcount: 1
+{ lat: 28, common_pid: 2302 } hitcount: 4
+{ lat: 29, common_pid: 2302 } hitcount: 1
+{ lat: 29, common_pid: 2300 } hitcount: 2
+{ lat: 29, common_pid: 2306 } hitcount: 1
+{ lat: 29, common_pid: 2304 } hitcount: 1
+{ lat: 30, common_pid: 2302 } hitcount: 4
+{ lat: 31, common_pid: 2302 } hitcount: 6
+{ lat: 32, common_pid: 2302 } hitcount: 1
+{ lat: 33, common_pid: 2299 } hitcount: 1
+{ lat: 33, common_pid: 2302 } hitcount: 3
+{ lat: 34, common_pid: 2302 } hitcount: 2
+{ lat: 35, common_pid: 2302 } hitcount: 1
+{ lat: 35, common_pid: 2304 } hitcount: 1
+{ lat: 36, common_pid: 2302 } hitcount: 4
+{ lat: 37, common_pid: 2302 } hitcount: 6
+{ lat: 38, common_pid: 2302 } hitcount: 2
+{ lat: 39, common_pid: 2302 } hitcount: 2
+{ lat: 39, common_pid: 2304 } hitcount: 1
+{ lat: 40, common_pid: 2304 } hitcount: 2
+{ lat: 40, common_pid: 2302 } hitcount: 5
+{ lat: 41, common_pid: 2304 } hitcount: 1
+{ lat: 41, common_pid: 2302 } hitcount: 8
+{ lat: 42, common_pid: 2302 } hitcount: 6
+{ lat: 42, common_pid: 2304 } hitcount: 1
+{ lat: 43, common_pid: 2302 } hitcount: 3
+{ lat: 43, common_pid: 2304 } hitcount: 4
+{ lat: 44, common_pid: 2302 } hitcount: 6
+{ lat: 45, common_pid: 2302 } hitcount: 5
+{ lat: 46, common_pid: 2302 } hitcount: 5
+{ lat: 47, common_pid: 2302 } hitcount: 7
+{ lat: 48, common_pid: 2301 } hitcount: 1
+{ lat: 48, common_pid: 2302 } hitcount: 9
+{ lat: 49, common_pid: 2302 } hitcount: 3
+{ lat: 50, common_pid: 2302 } hitcount: 1
+{ lat: 50, common_pid: 2301 } hitcount: 1
+{ lat: 51, common_pid: 2302 } hitcount: 2
+{ lat: 51, common_pid: 2301 } hitcount: 1
+{ lat: 61, common_pid: 2302 } hitcount: 1
+{ lat: 110, common_pid: 2302 } hitcount: 1
+
+Totals:
+ Hits: 89565
+ Entries: 158
+ Dropped: 0
+
+This doesn't tell us any information about how late cyclictest may have
+woken up, but it does show us a nice histogram of how long it took from
+the time that cyclictest was woken to the time it made it into user space.
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index ab4711c63601..42506e4d1f53 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -21,7 +21,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#define unlikely_notrace(x) __builtin_expect(!!(x), 0)

#define __branch_check__(x, expect, is_constant) ({ \
- int ______r; \
+ long ______r; \
static struct ftrace_likely_data \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_annotated_branch"))) \
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index a0233edc0718..b72ebdff0b77 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -65,7 +65,7 @@ u64 ring_buffer_event_time_stamp(struct ring_buffer_event *event);

/*
* ring_buffer_discard_commit will remove an event that has not
- * ben committed yet. If this is used, then ring_buffer_unlock_commit
+ * been committed yet. If this is used, then ring_buffer_unlock_commit
* must not be called on the discarded event. This function
* will try to remove the event from the ring buffer completely
* if another event has not been written after it.
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 2bde3eff564c..d1c442d9bd85 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -435,8 +435,7 @@ event_triggers_call(struct trace_event_file *file, void *rec,
struct ring_buffer_event *event);
extern void
event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt,
- void *rec, struct ring_buffer_event *event);
+ enum event_trigger_type tt);

bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);

diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index bfda803b0a09..4ecdfe2e3580 100644
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -422,6 +422,7 @@ static struct trace_event_functions trace_event_type_funcs_##call = { \
do { \
char *type_str = #type"["__stringify(len)"]"; \
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
+ BUILD_BUG_ON(len <= 0); \
ret = trace_define_field(event_call, type_str, #item, \
offsetof(typeof(field), item), \
sizeof(field.item), \
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index c9cb9767d49b..6a46af21765c 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -809,7 +809,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
*
* You can see, it is legitimate for the previous pointer of
* the head (or any page) not to point back to itself. But only
- * temporarially.
+ * temporarily.
*/

#define RB_PAGE_NORMAL 0UL
@@ -906,7 +906,7 @@ static void rb_list_head_clear(struct list_head *list)
}

/*
- * rb_head_page_dactivate - clears head page ptr (for free list)
+ * rb_head_page_deactivate - clears head page ptr (for free list)
*/
static void
rb_head_page_deactivate(struct ring_buffer_per_cpu *cpu_buffer)
@@ -1780,7 +1780,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size,

put_online_cpus();
} else {
- /* Make sure this CPU has been intitialized */
+ /* Make sure this CPU has been initialized */
if (!cpumask_test_cpu(cpu_id, buffer->cpumask))
goto out;

@@ -2325,7 +2325,7 @@ rb_update_event(struct ring_buffer_per_cpu *cpu_buffer,

/*
* If we need to add a timestamp, then we
- * add it to the start of the resevered space.
+ * add it to the start of the reserved space.
*/
if (unlikely(info->add_timestamp)) {
bool abs = ring_buffer_time_stamp_abs(cpu_buffer->buffer);
@@ -2681,7 +2681,7 @@ trace_recursive_unlock(struct ring_buffer_per_cpu *cpu_buffer)
* ring_buffer_nest_start - Allow to trace while nested
* @buffer: The ring buffer to modify
*
- * The ring buffer has a safty mechanism to prevent recursion.
+ * The ring buffer has a safety mechanism to prevent recursion.
* But there may be a case where a trace needs to be done while
* tracing something else. In this case, calling this function
* will allow this function to nest within a currently active
@@ -2699,7 +2699,7 @@ void ring_buffer_nest_start(struct ring_buffer *buffer)
preempt_disable_notrace();
cpu = raw_smp_processor_id();
cpu_buffer = buffer->buffers[cpu];
- /* This is the shift value for the above recusive locking */
+ /* This is the shift value for the above recursive locking */
cpu_buffer->nest += NESTED_BITS;
}

@@ -2718,7 +2718,7 @@ void ring_buffer_nest_end(struct ring_buffer *buffer)
/* disabled by ring_buffer_nest_start() */
cpu = raw_smp_processor_id();
cpu_buffer = buffer->buffers[cpu];
- /* This is the shift value for the above recusive locking */
+ /* This is the shift value for the above recursive locking */
cpu_buffer->nest -= NESTED_BITS;
preempt_enable_notrace();
}
@@ -2907,7 +2907,7 @@ rb_reserve_next_event(struct ring_buffer *buffer,
* @buffer: the ring buffer to reserve from
* @length: the length of the data to reserve (excluding event header)
*
- * Returns a reseverd event on the ring buffer to copy directly to.
+ * Returns a reserved event on the ring buffer to copy directly to.
* The user of this interface will need to get the body to write into
* and can use the ring_buffer_event_data() interface.
*
@@ -3009,7 +3009,7 @@ rb_decrement_entry(struct ring_buffer_per_cpu *cpu_buffer,
* This function lets the user discard an event in the ring buffer
* and then that event will not be read later.
*
- * This function only works if it is called before the the item has been
+ * This function only works if it is called before the item has been
* committed. It will try to free the event from the ring buffer
* if another event has not been added behind it.
*
@@ -4127,7 +4127,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_consume);
* through the buffer. Memory is allocated, buffer recording
* is disabled, and the iterator pointer is returned to the caller.
*
- * Disabling buffer recordng prevents the reading from being
+ * Disabling buffer recording prevents the reading from being
* corrupted. This is not a consuming read, so a producer is not
* expected.
*
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bcd93031d042..108ce3e1dc13 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4395,8 +4395,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
{
char *cmp;
int neg = 0;
- int ret = -ENODEV;
- int i;
+ int ret;
size_t orig_len = strlen(option);

cmp = strstrip(option);
@@ -4408,16 +4407,12 @@ static int trace_set_options(struct trace_array *tr, char *option)

mutex_lock(&trace_types_lock);

- for (i = 0; trace_options[i]; i++) {
- if (strcmp(cmp, trace_options[i]) == 0) {
- ret = set_tracer_flag(tr, 1 << i, !neg);
- break;
- }
- }
-
+ ret = match_string(trace_options, -1, cmp);
/* If no option could be set, test the specific tracer options */
- if (!trace_options[i])
+ if (ret < 0)
ret = set_tracer_option(tr, cmp, neg);
+ else
+ ret = set_tracer_flag(tr, 1 << ret, !neg);

mutex_unlock(&trace_types_lock);

@@ -6074,6 +6069,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
{
struct trace_array *tr = filp->private_data;
struct ring_buffer_event *event;
+ enum event_trigger_type tt = ETT_NONE;
struct ring_buffer *buffer;
struct print_entry *entry;
unsigned long irq_flags;
@@ -6122,6 +6118,12 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
written = cnt;
len = cnt;

+ if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) {
+ /* do not add \n before testing triggers, but add \0 */
+ entry->buf[cnt] = '\0';
+ tt = event_triggers_call(tr->trace_marker_file, entry, event);
+ }
+
if (entry->buf[cnt - 1] != '\n') {
entry->buf[cnt] = '\n';
entry->buf[cnt + 1] = '\0';
@@ -6130,6 +6132,9 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,

__buffer_unlock_commit(buffer, event);

+ if (tt)
+ event_triggers_post_call(tr->trace_marker_file, tt);
+
if (written > 0)
*fpos += written;

@@ -7896,6 +7901,7 @@ static __init void create_trace_instances(struct dentry *d_tracer)
static void
init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
{
+ struct trace_event_file *file;
int cpu;

trace_create_file("available_tracers", 0444, d_tracer,
@@ -7928,6 +7934,12 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
trace_create_file("trace_marker", 0220, d_tracer,
tr, &tracing_mark_fops);

+ file = __find_event_file(tr, "ftrace", "print");
+ if (file && file->dir)
+ trace_create_file("trigger", 0644, file->dir, file,
+ &event_trigger_fops);
+ tr->trace_marker_file = file;
+
trace_create_file("trace_marker_raw", 0220, d_tracer,
tr, &tracing_mark_raw_fops);

@@ -8111,6 +8123,8 @@ static __init int tracer_init_tracefs(void)
if (IS_ERR(d_tracer))
return 0;

+ event_trace_init();
+
init_tracer_tracefs(&global_trace, d_tracer);
ftrace_init_tracefs_toplevel(&global_trace, d_tracer);

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 507954b4e058..630c5a24b2b2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -259,6 +259,7 @@ struct trace_array {
struct trace_options *topts;
struct list_head systems;
struct list_head events;
+ struct trace_event_file *trace_marker_file;
cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
int ref;
#ifdef CONFIG_FUNCTION_TRACER
@@ -1334,7 +1335,7 @@ event_trigger_unlock_commit(struct trace_event_file *file,
trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);

if (tt)
- event_triggers_post_call(file, tt, entry, event);
+ event_triggers_post_call(file, tt);
}

/**
@@ -1367,7 +1368,7 @@ event_trigger_unlock_commit_regs(struct trace_event_file *file,
irq_flags, pc, regs);

if (tt)
- event_triggers_post_call(file, tt, entry, event);
+ event_triggers_post_call(file, tt);
}

#define FILTER_PRED_INVALID ((unsigned short)-1)
@@ -1451,9 +1452,13 @@ trace_find_event_field(struct trace_event_call *call, char *name);
extern void trace_event_enable_cmd_record(bool enable);
extern void trace_event_enable_tgid_record(bool enable);

+extern int event_trace_init(void);
extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
extern int event_trace_del_tracer(struct trace_array *tr);

+extern struct trace_event_file *__find_event_file(struct trace_array *tr,
+ const char *system,
+ const char *event);
extern struct trace_event_file *find_event_file(struct trace_array *tr,
const char *system,
const char *event);
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index e3a658bac10f..1d67464ed95e 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -230,7 +230,7 @@ FTRACE_ENTRY(bprint, bprint_entry,
FILTER_OTHER
);

-FTRACE_ENTRY(print, print_entry,
+FTRACE_ENTRY_REG(print, print_entry,

TRACE_PRINT,

@@ -242,7 +242,9 @@ FTRACE_ENTRY(print, print_entry,
F_printk("%ps: %s",
(void *)__entry->ip, __entry->buf),

- FILTER_OTHER
+ FILTER_OTHER,
+
+ ftrace_event_register
);

FTRACE_ENTRY(raw_data, raw_data_entry,
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 05c7172c6667..14ff4ff3caab 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2007,16 +2007,18 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file)
return -1;
}
}
- trace_create_file("filter", 0644, file->dir, file,
- &ftrace_event_filter_fops);

/*
* Only event directories that can be enabled should have
- * triggers.
+ * triggers or filters.
*/
- if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
+ if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) {
+ trace_create_file("filter", 0644, file->dir, file,
+ &ftrace_event_filter_fops);
+
trace_create_file("trigger", 0644, file->dir, file,
&event_trigger_fops);
+ }

#ifdef CONFIG_HIST_TRIGGERS
trace_create_file("hist", 0444, file->dir, file,
@@ -2473,8 +2475,9 @@ __trace_add_event_dirs(struct trace_array *tr)
}
}

+/* Returns any file that matches the system and event */
struct trace_event_file *
-find_event_file(struct trace_array *tr, const char *system, const char *event)
+__find_event_file(struct trace_array *tr, const char *system, const char *event)
{
struct trace_event_file *file;
struct trace_event_call *call;
@@ -2485,10 +2488,7 @@ find_event_file(struct trace_array *tr, const char *system, const char *event)
call = file->event_call;
name = trace_event_name(call);

- if (!name || !call->class || !call->class->reg)
- continue;
-
- if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
+ if (!name || !call->class)
continue;

if (strcmp(event, name) == 0 &&
@@ -2498,6 +2498,20 @@ find_event_file(struct trace_array *tr, const char *system, const char *event)
return NULL;
}

+/* Returns valid trace event files that match system and event */
+struct trace_event_file *
+find_event_file(struct trace_array *tr, const char *system, const char *event)
+{
+ struct trace_event_file *file;
+
+ file = __find_event_file(tr, system, event);
+ if (!file || !file->event_call->class->reg ||
+ file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
+ return NULL;
+
+ return file;
+}
+
#ifdef CONFIG_DYNAMIC_FTRACE

/* Avoid typos */
@@ -3132,7 +3146,7 @@ static __init int event_trace_enable_again(void)

early_initcall(event_trace_enable_again);

-static __init int event_trace_init(void)
+__init int event_trace_init(void)
{
struct trace_array *tr;
struct dentry *d_tracer;
@@ -3177,8 +3191,6 @@ void __init trace_event_init(void)
event_trace_enable();
}

-fs_initcall(event_trace_init);
-
#ifdef CONFIG_FTRACE_STARTUP_TEST

static DEFINE_SPINLOCK(test_spinlock);
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 7d306b74230f..0171407d231f 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -750,31 +750,32 @@ static int filter_pred_none(struct filter_pred *pred, void *event)
*
* Note:
* - @str might not be NULL-terminated if it's of type DYN_STRING
- * or STATIC_STRING
+ * or STATIC_STRING, unless @len is zero.
*/

static int regex_match_full(char *str, struct regex *r, int len)
{
- if (strncmp(str, r->pattern, len) == 0)
- return 1;
- return 0;
+ /* len of zero means str is dynamic and ends with '\0' */
+ if (!len)
+ return strcmp(str, r->pattern) == 0;
+
+ return strncmp(str, r->pattern, len) == 0;
}

static int regex_match_front(char *str, struct regex *r, int len)
{
- if (len < r->len)
+ if (len && len < r->len)
return 0;

- if (strncmp(str, r->pattern, r->len) == 0)
- return 1;
- return 0;
+ return strncmp(str, r->pattern, r->len) == 0;
}

static int regex_match_middle(char *str, struct regex *r, int len)
{
- if (strnstr(str, r->pattern, len))
- return 1;
- return 0;
+ if (!len)
+ return strstr(str, r->pattern) != NULL;
+
+ return strnstr(str, r->pattern, len) != NULL;
}

static int regex_match_end(char *str, struct regex *r, int len)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index b9061ed59bbd..046c716a6536 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2865,7 +2865,7 @@ static struct trace_event_file *event_file(struct trace_array *tr,
{
struct trace_event_file *file;

- file = find_event_file(tr, system, event_name);
+ file = __find_event_file(tr, system, event_name);
if (!file)
return ERR_PTR(-EINVAL);

diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 8b5bdcf64871..d18249683682 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -97,7 +97,6 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
* event_triggers_post_call - Call 'post_triggers' for a trace event
* @file: The trace_event_file associated with the event
* @tt: enum event_trigger_type containing a set bit for each trigger to invoke
- * @rec: The trace entry for the event
*
* For each trigger associated with an event, invoke the trigger
* function registered with the associated trigger command, if the
@@ -108,8 +107,7 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
*/
void
event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt,
- void *rec, struct ring_buffer_event *event)
+ enum event_trigger_type tt)
{
struct event_trigger_data *data;

@@ -117,7 +115,7 @@ event_triggers_post_call(struct trace_event_file *file,
if (data->paused)
continue;
if (data->cmd_ops->trigger_type & tt)
- data->ops->func(data, rec, event);
+ data->ops->func(data, NULL, NULL);
}
}
EXPORT_SYMBOL_GPL(event_triggers_post_call);
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 548e62eb5c46..45630a76ed3a 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -14,6 +14,13 @@

#include "trace_output.h"

+/* Stub function for events with triggers */
+static int ftrace_event_register(struct trace_event_call *call,
+ enum trace_reg type, void *data)
+{
+ return 0;
+}
+
#undef TRACE_SYSTEM
#define TRACE_SYSTEM ftrace

@@ -117,7 +124,7 @@ static void __always_unused ____ftrace_check_##name(void) \

#undef __dynamic_array
#define __dynamic_array(type, item) \
- ret = trace_define_field(event_call, #type, #item, \
+ ret = trace_define_field(event_call, #type "[]", #item, \
offsetof(typeof(field), item), \
0, is_signed_type(type), filter_type);\
if (ret) \
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 1e37da2e0c25..6dc6356c3327 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -257,7 +257,7 @@ static int tracepoint_remove_func(struct tracepoint *tp,
}

/**
- * tracepoint_probe_register - Connect a probe to a tracepoint
+ * tracepoint_probe_register_prio - Connect a probe to a tracepoint with priority
* @tp: tracepoint
* @probe: probe handler
* @data: tracepoint data
@@ -290,7 +290,6 @@ EXPORT_SYMBOL_GPL(tracepoint_probe_register_prio);
* @tp: tracepoint
* @probe: probe handler
* @data: tracepoint data
- * @prio: priority of this function over other registered functions
*
* Returns 0 if ok, error value on error.
* Note: if @tp is within a module, the caller is responsible for
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 8bdb1dc4072c..dcbca18011bb 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -207,6 +207,11 @@ cmd_modversions_c = \
endif

ifdef CONFIG_FTRACE_MCOUNT_RECORD
+# gcc 5 supports generating the mcount tables directly
+ifneq ($(call cc-option,-mrecord-mcount,y),y)
+KBUILD_CFLAGS += -mrecord-mcount
+else
+# else do it all manually
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
RECORDMCOUNT_FLAGS = -w
@@ -259,6 +264,7 @@ ifneq ($(RETPOLINE_CFLAGS),)
objtool_args += --retpoline
endif
endif
+endif


ifdef CONFIG_MODVERSIONS
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
index 2a4f16fc9819..e4645d5e3126 100644
--- a/tools/testing/selftests/ftrace/test.d/functions
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -15,14 +15,29 @@ reset_tracer() { # reset the current tracer
echo nop > current_tracer
}

-reset_trigger() { # reset all current setting triggers
- grep -v ^# events/*/*/trigger |
+reset_trigger_file() {
+ # remove action triggers first
+ grep -H ':on[^:]*(' $@ |
+ while read line; do
+ cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
+ file=`echo $line | cut -f1 -d:`
+ echo "!$cmd" >> $file
+ done
+ grep -Hv ^# $@ |
while read line; do
- cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "`
- echo "!$cmd" > `echo $line | cut -f1 -d:`
+ cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
+ file=`echo $line | cut -f1 -d:`
+ echo "!$cmd" > $file
done
}

+reset_trigger() { # reset all current setting triggers
+ if [ -d events/synthetic ]; then
+ reset_trigger_file events/synthetic/*/trigger
+ fi
+ reset_trigger_file events/*/*/trigger
+}
+
reset_events_filter() { # reset all current setting filters
grep -v ^none events/*/*/filter |
while read line; do
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
new file mode 100644
index 000000000000..2acbfe2c0c0c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
@@ -0,0 +1,49 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: trace_marker trigger - test histogram trigger
+# flags: instance
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit_fail
+}
+
+if [ ! -f set_event ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -d events/ftrace/print ]; then
+ echo "event trace_marker is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/hist ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+do_reset
+
+echo "Test histogram trace_marker tigger"
+
+echo 'hist:keys=common_pid' > events/ftrace/print/trigger
+for i in `seq 1 10` ; do echo "hello" > trace_marker; done
+grep 'hitcount: *10$' events/ftrace/print/hist > /dev/null || \
+ fail "hist trigger did not trigger correct times on trace_marker"
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
new file mode 100644
index 000000000000..6748e8cb42d0
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc
@@ -0,0 +1,74 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: trace_marker trigger - test snapshot trigger
+# flags: instance
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ echo 0 > snapshot
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit_fail
+}
+
+if [ ! -f set_event ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f snapshot ]; then
+ echo "snapshot is not supported"
+ exit_unsupported
+fi
+
+if [ ! -d events/ftrace/print ]; then
+ echo "event trace_marker is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+test_trace() {
+ file=$1
+ x=$2
+
+ cat $file | while read line; do
+ comment=`echo $line | sed -e 's/^#//'`
+ if [ "$line" != "$comment" ]; then
+ continue
+ fi
+ echo "testing $line for >$x<"
+ match=`echo $line | sed -e "s/>$x<//"`
+ if [ "$line" == "$match" ]; then
+ fail "$line does not have >$x< in it"
+ fi
+ let x=$x+2
+ done
+}
+
+do_reset
+
+echo "Test snapshot trace_marker tigger"
+
+echo 'snapshot' > events/ftrace/print/trigger
+
+# make sure the snapshot is allocated
+
+grep -q 'Snapshot is allocated' snapshot
+
+for i in `seq 1 10` ; do echo "hello >$i<" > trace_marker; done
+
+test_trace trace 1
+test_trace snapshot 2
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic-kernel.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic-kernel.tc
new file mode 100644
index 000000000000..0a69c5d1cda8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic-kernel.tc
@@ -0,0 +1,68 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: trace_marker trigger - test histogram with synthetic event against kernel event
+# flags:
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ echo > synthetic_events
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit_fail
+}
+
+if [ ! -f set_event ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f synthetic_events ]; then
+ echo "synthetic events not supported"
+ exit_unsupported
+fi
+
+if [ ! -d events/ftrace/print ]; then
+ echo "event trace_marker is not supported"
+ exit_unsupported
+fi
+
+if [ ! -d events/sched/sched_waking ]; then
+ echo "event sched_waking is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/hist ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+do_reset
+
+echo "Test histogram kernel event to trace_marker latency histogram trigger"
+
+echo 'latency u64 lat' > synthetic_events
+echo 'hist:keys=pid:ts0=common_timestamp.usecs' > events/sched/sched_waking/trigger
+echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).latency($lat)' > events/ftrace/print/trigger
+echo 'hist:keys=common_pid,lat:sort=lat' > events/synthetic/latency/trigger
+sleep 1
+echo "hello" > trace_marker
+
+grep 'hitcount: *1$' events/ftrace/print/hist > /dev/null || \
+ fail "hist trigger did not trigger correct times on trace_marker"
+
+grep 'hitcount: *1$' events/synthetic/latency/hist > /dev/null || \
+ fail "hist trigger did not trigger "
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic.tc
new file mode 100644
index 000000000000..3666dd6ab02a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-synthetic.tc
@@ -0,0 +1,66 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: trace_marker trigger - test histogram with synthetic event
+# flags:
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ echo > synthetic_events
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit_fail
+}
+
+if [ ! -f set_event ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f synthetic_events ]; then
+ echo "synthetic events not supported"
+ exit_unsupported
+fi
+
+if [ ! -d events/ftrace/print ]; then
+ echo "event trace_marker is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/ftrace/print/hist ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+do_reset
+
+echo "Test histogram trace_marker to trace_marker latency histogram trigger"
+
+echo 'latency u64 lat' > synthetic_events
+echo 'hist:keys=common_pid:ts0=common_timestamp.usecs if buf == "start"' > events/ftrace/print/trigger
+echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(ftrace.print).latency($lat) if buf == "end"' >> events/ftrace/print/trigger
+echo 'hist:keys=common_pid,lat:sort=lat' > events/synthetic/latency/trigger
+echo -n "start" > trace_marker
+echo -n "end" > trace_marker
+
+cnt=`grep 'hitcount: *1$' events/ftrace/print/hist | wc -l`
+
+if [ $cnt -ne 2 ]; then
+ fail "hist trace_marker trigger did not trigger correctly"
+fi
+
+grep 'hitcount: *1$' events/synthetic/latency/hist > /dev/null || \
+ fail "hist trigger did not trigger "
+
+do_reset
+
+exit 0