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usage message improvement, and drop printing probe name unless debug mode

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This commit is contained in:
Brendan Gregg
2015-06-27 17:21:50 -07:00
parent 5ea7fd3975
commit b4e8f3802c
1 changed files with 5 additions and 2 deletions
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7
kernel/kprobe
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@@ -82,6 +82,8 @@ function usage {
# trace open() with filename
kprobe -s 'p:myprobe tcp_retransmit_skb'
# show kernel stacks
kprobe 'p:do_sys_open file=+0(%si):string' 'file ~ "*stat"'
# opened files ending in "stat"
See the man page and example file for more info.
END
@@ -145,7 +147,7 @@ if (( $# )); then
fi
### option logic
(( opt_pid && opt_filter )) && die "ERROR: use either -p or -f."
(( opt_pid && opt_filter )) && die "ERROR: use either -p or a filter."
(( opt_duration && opt_view )) && die "ERROR: use either -d or -v."
if (( opt_pid )); then
# convert to filter
@@ -187,7 +189,8 @@ cd $tracing || die "ERROR: accessing tracing. Root user? Kernel has FTRACE?
## check function
set -- $kprobe
fname=$2
if (( !opt_force )) && ! grep -w $fname available_filter_functions 2>/dev/null
if (( !opt_force )) && ! grep -w $fname available_filter_functions >/dev/null \
2>&1
then
echo >&2 "ERROR: func $fname not in $PWD/available_filter_functions."
printf >&2 "Either it doesn't exist, or, it might be unsafe to kprobe. "