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ftrace: Assign iter->hash to filter or notrace hashes on seq read 

Instead of testing if the hash to use is the filter_hash or the notrace_hash
at each iteration, do the test at open, and set the iter->hash to point to
the corresponding filter or notrace hash. Then use that directly instead of
testing which hash needs to be used each iteration.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-03-29 14:55:49 -04:00
parent c1bc5919f6
commit c20489dad1
1 changed files with 9 additions and 12 deletions
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21
kernel/trace/ftrace.c
View File

@ -3157,7 +3157,6 @@ static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_iterator *iter = m->private;
struct ftrace_ops *ops = iter->ops;
struct dyn_ftrace *rec = NULL;
if (unlikely(ftrace_disabled))
@ -3181,11 +3180,8 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
}
} else {
rec = &iter->pg->records[iter->idx++];
if (((iter->flags & FTRACE_ITER_FILTER) &&
!(ftrace_lookup_ip(ops->func_hash->filter_hash, rec->ip))) ||
((iter->flags & FTRACE_ITER_NOTRACE) &&
!ftrace_lookup_ip(ops->func_hash->notrace_hash, rec->ip)) ||
if (((iter->flags & (FTRACE_ITER_FILTER | FTRACE_ITER_NOTRACE)) &&
!ftrace_lookup_ip(iter->hash, rec->ip)) ||
((iter->flags & FTRACE_ITER_ENABLED) &&
!(rec->flags & FTRACE_FL_ENABLED))) {
@ -3213,7 +3209,6 @@ static void reset_iter_read(struct ftrace_iterator *iter)
static void *t_start(struct seq_file *m, loff_t *pos)
{
struct ftrace_iterator *iter = m->private;
struct ftrace_ops *ops = iter->ops;
void *p = NULL;
loff_t l;
@ -3233,10 +3228,8 @@ static void *t_start(struct seq_file *m, loff_t *pos)
* off, we can short cut and just print out that all
* functions are enabled.
*/
if ((iter->flags & FTRACE_ITER_FILTER &&
ftrace_hash_empty(ops->func_hash->filter_hash)) ||
(iter->flags & FTRACE_ITER_NOTRACE &&
ftrace_hash_empty(ops->func_hash->notrace_hash))) {
if ((iter->flags & (FTRACE_ITER_FILTER | FTRACE_ITER_NOTRACE)) &&
ftrace_hash_empty(iter->hash)) {
if (*pos > 0)
return t_hash_start(m, pos);
iter->flags |= FTRACE_ITER_PRINTALL;
@ -3442,7 +3435,8 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
ret = -ENOMEM;
goto out_unlock;
}
}
} else
iter->hash = hash;
if (file->f_mode & FMODE_READ) {
iter->pg = ftrace_pages_start;
@ -4526,6 +4520,9 @@ int ftrace_regex_release(struct inode *inode, struct file *file)
free_ftrace_hash_rcu(old_hash);
}
mutex_unlock(&ftrace_lock);
} else {
/* For read only, the hash is the ops hash */
iter->hash = NULL;
}
mutex_unlock(&iter->ops->func_hash->regex_lock);