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tpoint: Make -p switch respect all process' threads

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This makes -p pass all the process thread ids to the ftrace
common_pid filters. Previously, only the main thread would be
traced for each process. The -L switch now works for only a
single, specified thread.

Signed-off-by: Sasha Goldshtein <goldshtn@gmail.com>
This commit is contained in:
Sasha Goldshtein
2017-09-04 11:06:39 -04:00
parent 5a511f5f77
commit 7579fea0dd
3 changed files with 26 additions and 11 deletions
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5
examples/tpoint_example.txt
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@@ -184,10 +184,11 @@ making it a read:
Use -h to print the USAGE message:
# ./tpoint -h
USAGE: tpoint [-hHsv] [-d secs] [-p PID] tracepoint [filter]
USAGE: tpoint [-hHsv] [-d secs] [-p PID] [-L TID] tracepoint [filter]
tpoint -l
-d seconds # trace duration, and use buffers
-p PID # PID to match on I/O issue
-p PID # PID to match on events
-L TID # thread id to match on events
-v # view format file (don't trace)
-H # include column headers
-l # list all tracepoints

5
man/man8/tpoint.8
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@@ -3,7 +3,7 @@
tpoint \- trace a given tracepoint. Static tracing. Uses Linux ftrace.
.SH SYNOPSIS
.B tpoint
[\-hHsv] [\-d secs] [\-p PID] tracepoint [filter]
[\-hHsv] [\-d secs] [\-p PID] [\-L TID] tracepoint [filter]
.B tpoint
\-l
@@ -53,6 +53,9 @@ for use in a custom filter.
\-p PID
Only trace kernel functions when this process ID is on-CPU.
.TP
\-L TID
Only trace kernel functions when this thread ID is on-CPU.
.TP
tracepoint
A tracepoint name. Eg, block:block_rq_issue. See the EXAMPLES section.
.TP

27
system/tpoint
View File

@@ -8,7 +8,7 @@
# printing live tracepoint events only. Wildcards are currently not supported.
# If this is insufficient for any reason, use the perf command instead.
#
# USAGE: ./tpoint [-hHsv] [-d secs] [-p pid] tracepoint [filter]
# USAGE: ./tpoint [-hHsv] [-d secs] [-p pid] [-L tid] tracepoint [filter]
# ./tpoint -l
#
# Run "tpoint -h" for full usage.
@@ -53,16 +53,17 @@
### default variables
tracing=/sys/kernel/debug/tracing
flock=/var/tmp/.ftrace-lock; wroteflock=0
opt_duration=0; duration=; opt_pid=0; pid=; opt_filter=0; filter=
opt_view=0; opt_headers=0; opt_stack=0; dmesg=2
opt_duration=0; duration=; opt_pid=0; pid=; opt_tid=0; tid=
opt_filter=0; filter=; opt_view=0; opt_headers=0; opt_stack=0; dmesg=2
trap ':' INT QUIT TERM PIPE HUP # sends execution to end tracing section
function usage {
cat <<-END >&2
USAGE: tpoint [-hHsv] [-d secs] [-p PID] tracepoint [filter]
USAGE: tpoint [-hHsv] [-d secs] [-p PID] [-L TID] tracepoint [filter]
tpoint -l
-d seconds # trace duration, and use buffers
-p PID # PID to match on I/O issue
-p PID # PID to match on event
-L TID # thread id to match on event
-v # view format file (don't trace)
-H # include column headers
-l # list all tracepoints
@@ -117,11 +118,12 @@ function edie {
}
### process options
while getopts d:hHlp:sv opt
while getopts d:hHlp:L:sv opt
do
case $opt in
d) opt_duration=1; duration=$OPTARG ;;
p) opt_pid=1; pid=$OPTARG ;;
L) opt_tid=1; tid=$OPTARG ;;
H) opt_headers=1 ;;
l) opt_list=1 ;;
s) opt_stack=1 ;;
@@ -141,12 +143,21 @@ if (( !opt_list )); then
fi
### option logic
(( opt_pid && opt_filter )) && die "ERROR: use either -p or -f."
(( opt_pid + opt_filter + opt_tid > 1 )) && \
die "ERROR: use at most one of -p, -L, or filter."
(( opt_duration && opt_view )) && die "ERROR: use either -d or -v."
if (( opt_pid )); then
# convert to filter
opt_filter=1
filter="common_pid == $pid"
# ftrace common_pid is thread id from user's perspective
for tid in /proc/$pid/task/*; do
filter="$filter || common_pid == ${tid##*/}"
done
filter=${filter:3} # trim leading ' || ' (four characters)
fi
if (( opt_tid )); then
opt_filter=1
filter="common_pid == $tid"
fi
if (( !opt_view && !opt_list )); then
if (( opt_duration )); then