From bd09d7b5efeb13965b6725b4a3e9944908bca9d2 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Thu, 20 Jan 2011 23:15:39 +0900 Subject: perf probe: Add variable filter support Add filters support for available variable list. Default filter is "!__k???tab_*&!__crc_*" for filtering out automatically generated symbols. The format of filter rule is "[!]GLOBPATTERN", so you can use wild cards. If the filter rule starts with '!', matched variables are filter out. e.g.: # perf probe -V schedule --externs --filter=cpu* Available variables at schedule @ cpumask_var_t cpu_callout_mask cpumask_var_t cpu_core_map cpumask_var_t cpu_isolated_map cpumask_var_t cpu_sibling_map int cpu_number long unsigned int* cpu_bit_bitmap ... Cc: 2nddept-manager@sdl.hitachi.co.jp Cc: Chase Douglas Cc: Franck Bui-Huu Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Srikar Dronamraju Cc: Steven Rostedt LKML-Reference: <20110120141539.25915.43401.stgit@ltc236.sdl.hitachi.co.jp> Signed-off-by: Masami Hiramatsu [ committer note: Removed the elf.h include as it was fixed up in e80711c] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-probe.txt | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'tools/perf/Documentation') diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index fcc51fe..32fb18f 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -77,6 +77,12 @@ OPTIONS --funcs:: Show available functions in given module or kernel. +--filter=FILTER:: + (Only for --vars) Set filter for variables. FILTER is a combination of + glob pattern, see FILTER PATTERN for details. + Default FILTER is "!__k???tab_* & !__crc_*". + If several filters are specified, only the last filter is valid. + -f:: --force:: Forcibly add events with existing name. @@ -139,6 +145,14 @@ e.g. This provides some sort of flexibility and robustness to probe point definitions against minor code changes. For example, actual 10th line of schedule() can be moved easily by modifying schedule(), but the same line matching 'rq=cpu_rq*' may still exist in the function.) +FILTER PATTERN +-------------- + The filter pattern is a glob matching pattern(s) to filter variables. + In addition, you can use "!" for specifying filter-out rule. You also can give several rules combined with "&" or "|", and fold those rules as one rule by using "(" ")". + +e.g. + With --filter "foo* | bar*", perf probe -V shows variables which start with "foo" or "bar". + With --filter "!foo* & *bar", perf probe -V shows variables which don't start with "foo" and end with "bar", like "fizzbar". But "foobar" is filtered out. EXAMPLES -------- -- cgit v1.1