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tracing/filter: Change filter_match_preds function to use walk_pred_tree 

Changing filter_match_preds function to use unified predicates tree
processing.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-10-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2011-08-11 16:25:53 +02:00 committed by Steven Rostedt
parent 96bc293a97
commit f30120fce1
1 changed files with 58 additions and 66 deletions
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124
kernel/trace/trace_events_filter.c
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@ -467,99 +467,91 @@ static int process_ops(struct filter_pred *preds,
for (i = 0; i < op->val; i++) {
pred = &preds[op->ops[i]];
match = pred->fn(pred, rec);
if (!WARN_ON_ONCE(!pred->fn))
match = pred->fn(pred, rec);
if (!!match == type)
return match;
}
return match;
}
struct filter_match_preds_data {
struct filter_pred *preds;
int match;
void *rec;
};
static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
struct filter_match_preds_data *d = data;
*err = 0;
switch (move) {
case MOVE_DOWN:
/* only AND and OR have children */
if (pred->left != FILTER_PRED_INVALID) {
/* If ops is set, then it was folded. */
if (!pred->ops)
return WALK_PRED_DEFAULT;
/* We can treat folded ops as a leaf node */
d->match = process_ops(d->preds, pred, d->rec);
} else {
if (!WARN_ON_ONCE(!pred->fn))
d->match = pred->fn(pred, d->rec);
}
return WALK_PRED_PARENT;
case MOVE_UP_FROM_LEFT:
/*
* Check for short circuits.
*
* Optimization: !!match == (pred->op == OP_OR)
* is the same as:
* if ((match && pred->op == OP_OR) ||
* (!match && pred->op == OP_AND))
*/
if (!!d->match == (pred->op == OP_OR))
return WALK_PRED_PARENT;
break;
case MOVE_UP_FROM_RIGHT:
break;
}
return WALK_PRED_DEFAULT;
}
/* return 1 if event matches, 0 otherwise (discard) */
int filter_match_preds(struct event_filter *filter, void *rec)
{
int match = -1;
enum move_type move = MOVE_DOWN;
struct filter_pred *preds;
struct filter_pred *pred;
struct filter_pred *root;
int n_preds;
int done = 0;
struct filter_match_preds_data data = {
/* match is currently meaningless */
.match = -1,
.rec = rec,
};
int n_preds, ret;
/* no filter is considered a match */
if (!filter)
return 1;
n_preds = filter->n_preds;
if (!n_preds)
return 1;
/*
* n_preds, root and filter->preds are protect with preemption disabled.
*/
preds = rcu_dereference_sched(filter->preds);
root = rcu_dereference_sched(filter->root);
if (!root)
return 1;
pred = root;
/* match is currently meaningless */
match = -1;
do {
switch (move) {
case MOVE_DOWN:
/* only AND and OR have children */
if (pred->left != FILTER_PRED_INVALID) {
/* If ops is set, then it was folded. */
if (!pred->ops) {
/* keep going to down the left side */
pred = &preds[pred->left];
continue;
}
/* We can treat folded ops as a leaf node */
match = process_ops(preds, pred, rec);
} else
match = pred->fn(pred, rec);
/* If this pred is the only pred */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
/*
* Check for short circuits.
*
* Optimization: !!match == (pred->op == OP_OR)
* is the same as:
* if ((match && pred->op == OP_OR) ||
* (!match && pred->op == OP_AND))
*/
if (!!match == (pred->op == OP_OR)) {
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
/* now go down the right side of the tree. */
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
/* We finished this equation. */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
return match;
data.preds = preds = rcu_dereference_sched(filter->preds);
ret = walk_pred_tree(preds, root, filter_match_preds_cb, &data);
WARN_ON(ret);
return data.match;
}
EXPORT_SYMBOL_GPL(filter_match_preds);