From: Jiri Olsa Changing filter_match_preds function to use unified predicates tree processing. Signed-off-by: Jiri Olsa Link: http://lkml.kernel.org/r/1313072754-4620-10-git-send-email-jolsa@redhat.com Signed-off-by: Steven Rostedt --- kernel/trace/trace_events_filter.c | 124 +++++++++++++++++------------------- 1 files changed, 58 insertions(+), 66 deletions(-) diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index f44e68b..319c3ca 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -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); -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/