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Date: Fri, 28 Nov 2008 10:32:41 +0800 From: walimis <walimisdev@...il.com> To: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu> Cc: linux-kernel@...r.kernel.org Subject: [PATCH 1/1] ftrace: improve document Impact: add notice of using wild cards correctly We know that we can use wild cards to set set_ftrace_filter, but there's problem when using such as "echo h* > /debug/tracing/set_ftrace_filter". If there are files named with "h" prefix in current directory, echo "h*" will echo these files' name to set_ftrace_filter, not "h*". For example: $cat /debug/tracing/available_filter_functions |grep ^hr |wc -l 23 $ls $touch hraa hrdd $ls hraa hrdd $echo hr* > /debug/tracing/set_ftrace_filter $cat /debug/tracing/set_ftrace_filter No output in /debug/tracing/set_ftrace_filter! If we use '' to enclose wild cards, it works: $ls hraa hrdd $echo "hr*" > /debug/tracing/set_ftrace_filter $cat /debug/tracing/set_ftrace_filter |wc -l 23 This problem can lead to unexpected result if current directory has a lot of files. Signed-off-by: walimis <walimisdev@...il.com> Reviewed-by: Ingo Molnar <mingo@...e.hu> --- Documentation/ftrace.txt | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/Documentation/ftrace.txt b/Documentation/ftrace.txt index de05042..0012a4a 100644 --- a/Documentation/ftrace.txt +++ b/Documentation/ftrace.txt @@ -1251,7 +1251,10 @@ These are the only wild cards which are supported. <match>*<match> will not work. - # echo hrtimer_* > /debug/tracing/set_ftrace_filter +Note: you'd better to use '' to enclose wild cards, otherwise in some +cases you can't get the correct result. + + # echo 'hrtimer_*' > /debug/tracing/set_ftrace_filter Produces: @@ -1306,7 +1309,7 @@ Again, now we want to append. # echo sys_nanosleep > /debug/tracing/set_ftrace_filter # cat /debug/tracing/set_ftrace_filter sys_nanosleep - # echo hrtimer_* >> /debug/tracing/set_ftrace_filter + # echo 'hrtimer_*' >> /debug/tracing/set_ftrace_filter # cat /debug/tracing/set_ftrace_filter hrtimer_run_queues hrtimer_run_pending -- 1.6.0.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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