From: walimis Date: Fri, 28 Nov 2008 04:21:19 +0000 (+0800) Subject: ftrace: improve documentation X-Git-Tag: v2.6.29-rc1~586^2~38^3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c072c24975ec4f0ccfcb6f5c8a8040b6eb75ef8f;p=pandora-kernel.git ftrace: improve documentation Impact: extend documentation with 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 them naively 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 filenames to set_ftrace_filter, not the intended "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 escape 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 Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed