xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ftrace: Support full glob matching

Browse Source 
Use glob_match() to support flexible glob wildcards (*,?)
and character classes ([) for ftrace.
Since the full glob matching is slower than the current
partial matching routines(*pat, pat*, *pat*), this leaves
those routines and just add MATCH_GLOB for complex glob
expression.

e.g.
----
[root@localhost tracing]# echo 'sched*group' > set_ftrace_filter
[root@localhost tracing]# cat set_ftrace_filter
sched_free_group
sched_change_group
sched_create_group
sched_online_group
sched_destroy_group
sched_offline_group
[root@localhost tracing]# echo '[Ss]y[Ss]_*' > set_ftrace_filter
[root@localhost tracing]# head set_ftrace_filter
sys_arch_prctl
sys_rt_sigreturn
sys_ioperm
SyS_iopl
sys_modify_ldt
SyS_mmap
SyS_set_thread_area
SyS_get_thread_area
SyS_set_tid_address
sys_fork
----

Link: http://lkml.kernel.org/r/147566869501.29136.6462645009894738056.stgit@devbox

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2016-10-05 20:58:15 +09:00
committed by Steven Rostedt
parent 546fece4ea
commit 60f1d5e3ba
7 changed files with 31 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/trace/events.txt
View File

@@ -189,16 +189,13 @@ And for string fields they are:
==, !=, ~
The glob (~) only accepts a wild card character (*) at the start and or
end of the string. For example:
The glob (~) accepts a wild card character (*,?) and character classes
([). For example:
prev_comm ~ "*sh"
prev_comm ~ "sh*"
prev_comm ~ "*sh*"
But does not allow for it to be within the string:
prev_comm ~ "ba*sh" <-- is invalid
prev_comm ~ "ba*sh"
5.2 Setting filters
-------------------

9
Documentation/trace/ftrace.txt
View File

@@ -2218,16 +2218,13 @@ hrtimer_interrupt
sys_nanosleep
Perhaps this is not enough. The filters also allow simple wild
cards. Only the following are currently available
Perhaps this is not enough. The filters also allow glob(7) matching.
<match>* - will match functions that begin with <match>
*<match> - will match functions that end with <match>
*<match>* - will match functions that have <match> in it
These are the only wild cards which are supported.
<match>*<match> will not work.
<match1>*<match2> - will match functions that begin with
<match1> and end with <match2>
Note: It is better to use quotes to enclose the wild cards,
otherwise the shell may expand the parameters into names