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ftrace: break up ftrace_match_records into smaller components

Browse source 
Impact: clean up

ftrace_match_records does a lot of things that other features
can use. This patch breaks up ftrace_match_records and pulls
out ftrace_setup_glob and ftrace_match_record.

ftrace_setup_glob prepares a simple glob expression for use with
ftrace_match_record. ftrace_match_record compares a single record
with a glob type.

Breaking this up will allow for more features to run on individual
records.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-13 15:56:43 -05:00
parent 7f24b31b01
commit 9f4801e30a
1 changed files with 75 additions and 40 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

115
kernel/trace/ftrace.c
View file

@ -1053,79 +1053,114 @@ enum {
MATCH_END_ONLY,
};
static void
ftrace_match_records(unsigned char *buff, int len, int enable)
/*
* (static function - no need for kernel doc)
*
* Pass in a buffer containing a glob and this function will
* set search to point to the search part of the buffer and
* return the type of search it is (see enum above).
* This does modify buff.
*
* Returns enum type.
* search returns the pointer to use for comparison.
* not returns 1 if buff started with a '!'
* 0 otherwise.
*/
static int
ftrace_setup_glob(unsigned char *buff, int len, char **search, int *not)
{
char str[KSYM_SYMBOL_LEN];
char *search = NULL;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
int type = MATCH_FULL;
unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
unsigned i, match = 0, search_len = 0;
int not = 0;
int i;
if (buff[0] == '!') {
not = 1;
*not = 1;
buff++;
len--;
}
} else
*not = 0;
*search = buff;
for (i = 0; i < len; i++) {
if (buff[i] == '*') {
if (!i) {
search = buff + i + 1;
*search = buff + 1;
type = MATCH_END_ONLY;
search_len = len - (i + 1);
} else {
if (type == MATCH_END_ONLY) {
if (type == MATCH_END_ONLY)
type = MATCH_MIDDLE_ONLY;
} else {
match = i;
else
type = MATCH_FRONT_ONLY;
}
buff[i] = 0;
break;
}
}
}
return type;
}
static int
ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type)
{
char str[KSYM_SYMBOL_LEN];
int matched = 0;
char *ptr;
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
switch (type) {
case MATCH_FULL:
if (strcmp(str, regex) == 0)
matched = 1;
break;
case MATCH_FRONT_ONLY:
if (strncmp(str, regex, len) == 0)
matched = 1;
break;
case MATCH_MIDDLE_ONLY:
if (strstr(str, regex))
matched = 1;
break;
case MATCH_END_ONLY:
ptr = strstr(str, regex);
if (ptr && (ptr[len] == 0))
matched = 1;
break;
}
return matched;
}
static void ftrace_match_records(char *buff, int len, int enable)
{
char *search;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
int type;
unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
unsigned search_len;
int not;
type = ftrace_setup_glob(buff, len, &search, &not);
search_len = strlen(search);
/* should not be called from interrupt context */
spin_lock(&ftrace_lock);
if (enable)
ftrace_filtered = 1;
do_for_each_ftrace_rec(pg, rec) {
int matched = 0;
char *ptr;
if (rec->flags & FTRACE_FL_FAILED)
continue;
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
switch (type) {
case MATCH_FULL:
if (strcmp(str, buff) == 0)
matched = 1;
break;
case MATCH_FRONT_ONLY:
if (memcmp(str, buff, match) == 0)
matched = 1;
break;
case MATCH_MIDDLE_ONLY:
if (strstr(str, search))
matched = 1;
break;
case MATCH_END_ONLY:
ptr = strstr(str, search);
if (ptr && (ptr[search_len] == 0))
matched = 1;
break;
}
if (matched) {
if (ftrace_match_record(rec, search, search_len, type)) {
if (not)
rec->flags &= ~flag;
else
rec->flags |= flag;
}
} while_for_each_ftrace_rec();
spin_unlock(&ftrace_lock);
}