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authorMasami Hiramatsu <mhiramat@kernel.org>2016-10-05 20:58:15 +0900
committerSteven Rostedt <rostedt@goodmis.org>2016-11-14 16:42:58 -0500
commit60f1d5e3bac44b598f67d36062da96c095d2b700 (patch)
tree87990c058f734d14b446e99772548971138e1192 /kernel/trace
parent546fece4eae871f033925ccf0ff2b740725ae915 (diff)
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ftrace: Support full glob matching
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/Kconfig2
-rw-r--r--kernel/trace/ftrace.c4
-rw-r--r--kernel/trace/trace.c2
-rw-r--r--kernel/trace/trace.h2
-rw-r--r--kernel/trace/trace_events_filter.c17
5 files changed, 25 insertions, 2 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 2a96b063d659..d5038005eb5d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -70,6 +70,7 @@ config FTRACE_NMI_ENTER
config EVENT_TRACING
select CONTEXT_SWITCH_TRACER
+ select GLOB
bool
config CONTEXT_SWITCH_TRACER
@@ -133,6 +134,7 @@ config FUNCTION_TRACER
select KALLSYMS
select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
+ select GLOB
help
Enable the kernel to trace every kernel function. This is done
by using a compiler feature to insert a small, 5-byte No-Operation
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index da87b3cba5b3..356bb70d071e 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3511,6 +3511,10 @@ static int ftrace_match(char *str, struct ftrace_glob *g)
memcmp(str + slen - g->len, g->search, g->len) == 0)
matched = 1;
break;
+ case MATCH_GLOB:
+ if (glob_match(g->search, str))
+ matched = 1;
+ break;
}
return matched;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8696ce6bf2f6..d904516dfdab 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4065,7 +4065,7 @@ static const char readme_msg[] =
"\n available_filter_functions - list of functions that can be filtered on\n"
" set_ftrace_filter\t- echo function name in here to only trace these\n"
"\t\t\t functions\n"
- "\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
+ "\t accepts: func_full_name or glob-matching-pattern\n"
"\t modules: Can select a group via module\n"
"\t Format: :mod:<module-name>\n"
"\t example: echo :mod:ext3 > set_ftrace_filter\n"
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index fd24b1f9ac43..4b7918902ab8 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -15,6 +15,7 @@
#include <linux/trace_events.h>
#include <linux/compiler.h>
#include <linux/trace_seq.h>
+#include <linux/glob.h>
#ifdef CONFIG_FTRACE_SYSCALLS
#include <asm/unistd.h> /* For NR_SYSCALLS */
@@ -1257,6 +1258,7 @@ enum regex_type {
MATCH_FRONT_ONLY,
MATCH_MIDDLE_ONLY,
MATCH_END_ONLY,
+ MATCH_GLOB,
};
struct regex {
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 9daa9b3bc6d9..e1c7e2cdc240 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -344,6 +344,12 @@ static int regex_match_end(char *str, struct regex *r, int len)
return 0;
}
+static int regex_match_glob(char *str, struct regex *r, int len __maybe_unused)
+{
+ if (glob_match(r->pattern, str))
+ return 1;
+ return 0;
+}
/**
* filter_parse_regex - parse a basic regex
* @buff: the raw regex
@@ -380,14 +386,20 @@ enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not)
if (!i) {
*search = buff + 1;
type = MATCH_END_ONLY;
- } else {
+ } else if (i == len - 1) {
if (type == MATCH_END_ONLY)
type = MATCH_MIDDLE_ONLY;
else
type = MATCH_FRONT_ONLY;
buff[i] = 0;
break;
+ } else { /* pattern continues, use full glob */
+ type = MATCH_GLOB;
+ break;
}
+ } else if (strchr("[?\\", buff[i])) {
+ type = MATCH_GLOB;
+ break;
}
}
@@ -420,6 +432,9 @@ static void filter_build_regex(struct filter_pred *pred)
case MATCH_END_ONLY:
r->match = regex_match_end;
break;
+ case MATCH_GLOB:
+ r->match = regex_match_glob;
+ break;
}
pred->not ^= not;