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tracing/filter: Add startup tests for events filter
Adding automated tests running as late_initcall. Tests are compiled in with CONFIG_FTRACE_STARTUP_TEST option. Adding test event "ftrace_test_filter" used to simulate filter processing during event occurance. String filters are compiled and tested against several test events with different values. Also testing that evaluation of explicit predicates is ommited due to the lazy filter evaluation. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1313072754-4620-11-git-send-email-jolsa@redhat.com Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa
Steven Rostedt
parent
f30120fce1
commit
1d0e78e380
@ -15,6 +15,8 @@ ifdef CONFIG_TRACING_BRANCHES
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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endif
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CFLAGS_trace_events_filter.o := -I$(src)
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#
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# Make the trace clocks available generally: it's infrastructure
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# relied on by ptrace for example:
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@ -762,6 +762,9 @@ struct filter_pred {
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u64 val;
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struct regex regex;
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unsigned short *ops;
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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struct ftrace_event_field *field;
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#endif
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int offset;
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int not;
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int op;
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@ -1329,6 +1329,9 @@ static struct filter_pred *create_pred(struct filter_parse_state *ps,
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strcpy(pred.regex.pattern, operand2);
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pred.regex.len = strlen(pred.regex.pattern);
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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pred.field = field;
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#endif
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return init_pred(ps, field, &pred) ? NULL : &pred;
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}
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@ -1926,3 +1929,209 @@ out_unlock:
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#endif /* CONFIG_PERF_EVENTS */
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#define CREATE_TRACE_POINTS
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#include "trace_events_filter_test.h"
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static int test_get_filter(char *filter_str, struct ftrace_event_call *call,
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struct event_filter **pfilter)
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{
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struct event_filter *filter;
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struct filter_parse_state *ps;
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int err = -ENOMEM;
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filter = __alloc_filter();
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if (!filter)
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goto out;
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ps = kzalloc(sizeof(*ps), GFP_KERNEL);
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if (!ps)
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goto free_filter;
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parse_init(ps, filter_ops, filter_str);
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err = filter_parse(ps);
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if (err)
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goto free_ps;
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err = replace_preds(call, filter, ps, filter_str, false);
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if (!err)
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*pfilter = filter;
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free_ps:
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filter_opstack_clear(ps);
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postfix_clear(ps);
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kfree(ps);
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free_filter:
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if (err)
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__free_filter(filter);
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out:
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return err;
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}
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#define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \
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{ \
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.filter = FILTER, \
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.rec = { .a = va, .b = vb, .c = vc, .d = vd, \
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.e = ve, .f = vf, .g = vg, .h = vh }, \
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.match = m, \
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.not_visited = nvisit, \
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}
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#define YES 1
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#define NO 0
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static struct test_filter_data_t {
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char *filter;
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struct ftrace_raw_ftrace_test_filter rec;
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int match;
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char *not_visited;
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} test_filter_data[] = {
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#define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \
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"e == 1 && f == 1 && g == 1 && h == 1"
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DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""),
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DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"),
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DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""),
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#undef FILTER
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#define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \
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"e == 1 || f == 1 || g == 1 || h == 1"
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DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
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DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""),
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DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"),
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#undef FILTER
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#define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \
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"(e == 1 || f == 1) && (g == 1 || h == 1)"
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DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"),
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DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
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DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"),
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DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"),
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#undef FILTER
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#define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \
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"(e == 1 && f == 1) || (g == 1 && h == 1)"
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DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"),
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DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""),
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DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
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#undef FILTER
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#define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \
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"(e == 1 && f == 1) || (g == 1 && h == 1)"
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DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"),
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DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
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DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""),
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#undef FILTER
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#define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \
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"(e == 1 || f == 1)) && (g == 1 || h == 1)"
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DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"),
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DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
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DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"),
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#undef FILTER
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#define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \
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"(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))"
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DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"),
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DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""),
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DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""),
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#undef FILTER
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#define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \
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"(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))"
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DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"),
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DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
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DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"),
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};
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#undef DATA_REC
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#undef FILTER
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#undef YES
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#undef NO
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#define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t))
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static int test_pred_visited;
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static int test_pred_visited_fn(struct filter_pred *pred, void *event)
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{
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struct ftrace_event_field *field = pred->field;
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test_pred_visited = 1;
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printk(KERN_INFO "\npred visited %s\n", field->name);
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return 1;
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}
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static int test_walk_pred_cb(enum move_type move, struct filter_pred *pred,
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int *err, void *data)
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{
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char *fields = data;
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if ((move == MOVE_DOWN) &&
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(pred->left == FILTER_PRED_INVALID)) {
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struct ftrace_event_field *field = pred->field;
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if (!field) {
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WARN(1, "all leafs should have field defined");
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return WALK_PRED_DEFAULT;
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}
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if (!strchr(fields, *field->name))
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return WALK_PRED_DEFAULT;
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WARN_ON(!pred->fn);
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pred->fn = test_pred_visited_fn;
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}
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return WALK_PRED_DEFAULT;
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}
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static __init int ftrace_test_event_filter(void)
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{
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int i;
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printk(KERN_INFO "Testing ftrace filter: ");
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for (i = 0; i < DATA_CNT; i++) {
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struct event_filter *filter = NULL;
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struct test_filter_data_t *d = &test_filter_data[i];
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int err;
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err = test_get_filter(d->filter, &event_ftrace_test_filter,
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&filter);
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if (err) {
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printk(KERN_INFO
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"Failed to get filter for '%s', err %d\n",
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d->filter, err);
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break;
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}
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if (*d->not_visited)
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walk_pred_tree(filter->preds, filter->root,
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test_walk_pred_cb,
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d->not_visited);
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test_pred_visited = 0;
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err = filter_match_preds(filter, &d->rec);
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__free_filter(filter);
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if (test_pred_visited) {
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printk(KERN_INFO
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"Failed, unwanted pred visited for filter %s\n",
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d->filter);
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break;
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}
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if (err != d->match) {
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printk(KERN_INFO
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"Failed to match filter '%s', expected %d\n",
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d->filter, d->match);
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break;
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}
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}
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if (i == DATA_CNT)
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printk(KERN_CONT "OK\n");
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return 0;
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}
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late_initcall(ftrace_test_event_filter);
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#endif /* CONFIG_FTRACE_STARTUP_TEST */
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50
kernel/trace/trace_events_filter_test.h
Normal file
50
kernel/trace/trace_events_filter_test.h
Normal file
@ -0,0 +1,50 @@
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM test
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#if !defined(_TRACE_TEST_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_TEST_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(ftrace_test_filter,
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TP_PROTO(int a, int b, int c, int d, int e, int f, int g, int h),
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TP_ARGS(a, b, c, d, e, f, g, h),
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TP_STRUCT__entry(
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__field(int, a)
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__field(int, b)
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__field(int, c)
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__field(int, d)
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__field(int, e)
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__field(int, f)
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__field(int, g)
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__field(int, h)
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),
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TP_fast_assign(
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__entry->a = a;
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__entry->b = b;
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__entry->c = c;
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__entry->d = d;
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__entry->e = e;
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__entry->f = f;
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__entry->g = g;
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__entry->h = h;
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),
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TP_printk("a %d, b %d, c %d, d %d, e %d, f %d, g %d, h %d",
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__entry->a, __entry->b, __entry->c, __entry->d,
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__entry->e, __entry->f, __entry->g, __entry->h)
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);
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#endif /* _TRACE_TEST_H || TRACE_HEADER_MULTI_READ */
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#undef TRACE_INCLUDE_PATH
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_PATH .
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#define TRACE_INCLUDE_FILE trace_events_filter_test
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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