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-rw-r--r--tools/perf/builtin-diff.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
new file mode 100644
index 000000000000..0d528018ffb8
--- /dev/null
+++ b/tools/perf/builtin-diff.c
@@ -0,0 +1,288 @@
+/*
+ * builtin-diff.c
+ *
+ * Builtin diff command: Analyze two perf.data input files, look up and read
+ * DSOs and symbol information, sort them and produce a diff.
+ */
+#include "builtin.h"
+
+#include "util/debug.h"
+#include "util/event.h"
+#include "util/hist.h"
+#include "util/session.h"
+#include "util/sort.h"
+#include "util/symbol.h"
+#include "util/util.h"
+
+#include <stdlib.h>
+
+static char const *input_old = "perf.data.old",
+ *input_new = "perf.data";
+static int force;
+static bool show_percent;
+
+struct symbol_conf symbol_conf;
+
+static int perf_session__add_hist_entry(struct perf_session *self,
+ struct addr_location *al, u64 count)
+{
+ bool hit;
+ struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
+ count, &hit);
+ if (he == NULL)
+ return -ENOMEM;
+
+ if (hit)
+ he->count += count;
+
+ return 0;
+}
+
+static int diff__process_sample_event(event_t *event, struct perf_session *session)
+{
+ struct addr_location al;
+ struct sample_data data = { .period = 1, };
+
+ dump_printf("(IP, %d): %d: %p\n", event->header.misc,
+ event->ip.pid, (void *)(long)event->ip.ip);
+
+ if (event__preprocess_sample(event, session, &al, NULL) < 0) {
+ pr_warning("problem processing %d event, skipping it.\n",
+ event->header.type);
+ return -1;
+ }
+
+ event__parse_sample(event, session->sample_type, &data);
+
+ if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
+ pr_warning("problem incrementing symbol count, skipping event\n");
+ return -1;
+ }
+
+ session->events_stats.total += data.period;
+ return 0;
+}
+
+static struct perf_event_ops event_ops = {
+ .process_sample_event = diff__process_sample_event,
+ .process_mmap_event = event__process_mmap,
+ .process_comm_event = event__process_comm,
+ .process_exit_event = event__process_task,
+ .process_fork_event = event__process_task,
+ .process_lost_event = event__process_lost,
+};
+
+static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
+ struct hist_entry *he)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ struct hist_entry *iter;
+
+ while (*p != NULL) {
+ int cmp;
+ parent = *p;
+ iter = rb_entry(parent, struct hist_entry, rb_node);
+
+ cmp = strcmp(he->map->dso->name, iter->map->dso->name);
+ if (cmp > 0)
+ p = &(*p)->rb_left;
+ else if (cmp < 0)
+ p = &(*p)->rb_right;
+ else {
+ cmp = strcmp(he->sym->name, iter->sym->name);
+ if (cmp > 0)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+ }
+
+ rb_link_node(&he->rb_node, parent, p);
+ rb_insert_color(&he->rb_node, root);
+}
+
+static void perf_session__resort_by_name(struct perf_session *self)
+{
+ unsigned long position = 1;
+ struct rb_root tmp = RB_ROOT;
+ struct rb_node *next = rb_first(&self->hists);
+
+ while (next != NULL) {
+ struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
+
+ next = rb_next(&n->rb_node);
+ rb_erase(&n->rb_node, &self->hists);
+ n->position = position++;
+ perf_session__insert_hist_entry_by_name(&tmp, n);
+ }
+
+ self->hists = tmp;
+}
+
+static struct hist_entry *
+perf_session__find_hist_entry_by_name(struct perf_session *self,
+ struct hist_entry *he)
+{
+ struct rb_node *n = self->hists.rb_node;
+
+ while (n) {
+ struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
+ int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
+
+ if (cmp > 0)
+ n = n->rb_left;
+ else if (cmp < 0)
+ n = n->rb_right;
+ else {
+ cmp = strcmp(he->sym->name, iter->sym->name);
+ if (cmp > 0)
+ n = n->rb_left;
+ else if (cmp < 0)
+ n = n->rb_right;
+ else
+ return iter;
+ }
+ }
+
+ return NULL;
+}
+
+static void perf_session__match_hists(struct perf_session *old_session,
+ struct perf_session *new_session)
+{
+ struct rb_node *nd;
+
+ perf_session__resort_by_name(old_session);
+
+ for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
+ struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
+ pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
+ }
+}
+
+static size_t hist_entry__fprintf_matched(struct hist_entry *self,
+ unsigned long pos,
+ struct perf_session *session,
+ struct perf_session *pair_session,
+ FILE *fp)
+{
+ u64 old_count = 0;
+ char displacement[16];
+ size_t printed;
+
+ if (self->pair != NULL) {
+ long pdiff = (long)self->pair->position - (long)pos;
+ old_count = self->pair->count;
+ if (pdiff == 0)
+ goto blank;
+ snprintf(displacement, sizeof(displacement), "%+4ld", pdiff);
+ } else {
+blank: memset(displacement, ' ', sizeof(displacement));
+ }
+
+ printed = fprintf(fp, "%4lu %5.5s ", pos, displacement);
+
+ if (show_percent) {
+ double old_percent = (old_count * 100) / pair_session->events_stats.total,
+ new_percent = (self->count * 100) / session->events_stats.total;
+ double diff = old_percent - new_percent;
+
+ if (verbose)
+ printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent);
+
+ if ((u64)diff != 0)
+ printed += fprintf(fp, " %+4.2F%%", diff);
+ else
+ printed += fprintf(fp, " ");
+ } else {
+ if (verbose)
+ printed += fprintf(fp, " %9Lu %9Lu", old_count, self->count);
+ printed += fprintf(fp, " %+9Ld", (s64)self->count - (s64)old_count);
+ }
+
+ return printed + fprintf(fp, " %25.25s %s\n",
+ self->map->dso->name, self->sym->name);
+}
+
+static size_t perf_session__fprintf_matched_hists(struct perf_session *self,
+ struct perf_session *pair,
+ FILE *fp)
+{
+ struct rb_node *nd;
+ size_t printed = 0;
+ unsigned long pos = 1;
+
+ for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
+ struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
+ printed += hist_entry__fprintf_matched(he, pos++, self, pair, fp);
+ }
+
+ return printed;
+}
+
+static int __cmd_diff(void)
+{
+ int ret, i;
+ struct perf_session *session[2];
+
+ session[0] = perf_session__new(input_old, O_RDONLY, force, &symbol_conf);
+ session[1] = perf_session__new(input_new, O_RDONLY, force, &symbol_conf);
+ if (session[0] == NULL || session[1] == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < 2; ++i) {
+ ret = perf_session__process_events(session[i], &event_ops);
+ if (ret)
+ goto out_delete;
+ perf_session__output_resort(session[i], session[i]->events_stats.total);
+ }
+
+ perf_session__match_hists(session[0], session[1]);
+ perf_session__fprintf_matched_hists(session[1], session[0], stdout);
+out_delete:
+ for (i = 0; i < 2; ++i)
+ perf_session__delete(session[i]);
+ return ret;
+}
+
+static const char *const diff_usage[] = {
+ "perf diff [<options>] [old_file] [new_file]",
+};
+
+static const struct option options[] = {
+ OPT_BOOLEAN('v', "verbose", &verbose,
+ "be more verbose (show symbol address, etc)"),
+ OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
+ "dump raw trace in ASCII"),
+ OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+ OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
+ "load module symbols - WARNING: use only with -k and LIVE kernel"),
+ OPT_BOOLEAN('p', "percentages", &show_percent,
+ "Don't shorten the pathnames taking into account the cwd"),
+ OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
+ "Don't shorten the pathnames taking into account the cwd"),
+ OPT_END()
+};
+
+int cmd_diff(int argc, const char **argv, const char *prefix __used)
+{
+ if (symbol__init(&symbol_conf) < 0)
+ return -1;
+
+ setup_sorting(diff_usage, options);
+
+ argc = parse_options(argc, argv, options, diff_usage, 0);
+ if (argc) {
+ if (argc > 2)
+ usage_with_options(diff_usage, options);
+ if (argc == 2) {
+ input_old = argv[0];
+ input_new = argv[1];
+ } else
+ input_new = argv[0];
+ }
+
+ setup_pager();
+ return __cmd_diff();
+}
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