233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
/*
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* builtin-diff.c
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*
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* Builtin diff command: Analyze two perf.data input files, look up and read
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* DSOs and symbol information, sort them and produce a diff.
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*/
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#include "builtin.h"
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#include "util/debug.h"
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#include "util/event.h"
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#include "util/hist.h"
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#include "util/session.h"
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#include "util/sort.h"
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#include "util/symbol.h"
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#include "util/util.h"
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#include <stdlib.h>
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static char const *input_old = "perf.data.old",
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*input_new = "perf.data";
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static char diff__default_sort_order[] = "dso,symbol";
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static bool force;
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static bool show_displacement;
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static int hists__add_entry(struct hists *self,
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struct addr_location *al, u64 period)
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{
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if (__hists__add_entry(self, al, NULL, period) != NULL)
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return 0;
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return -ENOMEM;
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}
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static int diff__process_sample_event(event_t *event,
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struct sample_data *sample,
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struct perf_session *session)
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{
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struct addr_location al;
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if (event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
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pr_warning("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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if (al.filtered || al.sym == NULL)
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return 0;
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if (hists__add_entry(&session->hists, &al, sample->period)) {
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pr_warning("problem incrementing symbol period, skipping event\n");
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return -1;
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}
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session->hists.stats.total_period += sample->period;
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return 0;
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}
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static struct perf_event_ops event_ops = {
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.sample = diff__process_sample_event,
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.mmap = event__process_mmap,
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.comm = event__process_comm,
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.exit = event__process_task,
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.fork = event__process_task,
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.lost = event__process_lost,
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.ordered_samples = true,
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.ordering_requires_timestamps = true,
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};
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static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
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struct hist_entry *he)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct hist_entry *iter;
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while (*p != NULL) {
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parent = *p;
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iter = rb_entry(parent, struct hist_entry, rb_node);
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if (hist_entry__cmp(he, iter) < 0)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&he->rb_node, parent, p);
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rb_insert_color(&he->rb_node, root);
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}
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static void hists__resort_entries(struct hists *self)
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{
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unsigned long position = 1;
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struct rb_root tmp = RB_ROOT;
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struct rb_node *next = rb_first(&self->entries);
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while (next != NULL) {
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struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
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next = rb_next(&n->rb_node);
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rb_erase(&n->rb_node, &self->entries);
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n->position = position++;
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perf_session__insert_hist_entry_by_name(&tmp, n);
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}
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self->entries = tmp;
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}
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static void hists__set_positions(struct hists *self)
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{
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hists__output_resort(self);
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hists__resort_entries(self);
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}
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static struct hist_entry *hists__find_entry(struct hists *self,
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struct hist_entry *he)
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{
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struct rb_node *n = self->entries.rb_node;
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while (n) {
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struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
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int64_t cmp = hist_entry__cmp(he, iter);
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if (cmp < 0)
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n = n->rb_left;
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else if (cmp > 0)
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n = n->rb_right;
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else
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return iter;
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}
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return NULL;
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}
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static void hists__match(struct hists *older, struct hists *newer)
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{
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struct rb_node *nd;
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for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
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struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
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pos->pair = hists__find_entry(older, pos);
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}
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}
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static int __cmd_diff(void)
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{
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int ret, i;
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struct perf_session *session[2];
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session[0] = perf_session__new(input_old, O_RDONLY, force, false, &event_ops);
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session[1] = perf_session__new(input_new, O_RDONLY, force, false, &event_ops);
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if (session[0] == NULL || session[1] == NULL)
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return -ENOMEM;
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for (i = 0; i < 2; ++i) {
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ret = perf_session__process_events(session[i], &event_ops);
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if (ret)
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goto out_delete;
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}
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hists__output_resort(&session[1]->hists);
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if (show_displacement)
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hists__set_positions(&session[0]->hists);
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hists__match(&session[0]->hists, &session[1]->hists);
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hists__fprintf(&session[1]->hists, &session[0]->hists,
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show_displacement, stdout);
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out_delete:
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for (i = 0; i < 2; ++i)
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perf_session__delete(session[i]);
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return ret;
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}
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static const char * const diff_usage[] = {
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"perf diff [<options>] [old_file] [new_file]",
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NULL,
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};
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static const struct option options[] = {
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_BOOLEAN('M', "displacement", &show_displacement,
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"Show position displacement relative to baseline"),
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
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OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
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"load module symbols - WARNING: use only with -k and LIVE kernel"),
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OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
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"only consider symbols in these dsos"),
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OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
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"only consider symbols in these comms"),
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OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
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"only consider these symbols"),
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OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
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"sort by key(s): pid, comm, dso, symbol, parent"),
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OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
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"separator for columns, no spaces will be added between "
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"columns '.' is reserved."),
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OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
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"Look for files with symbols relative to this directory"),
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OPT_END()
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};
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int cmd_diff(int argc, const char **argv, const char *prefix __used)
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{
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sort_order = diff__default_sort_order;
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argc = parse_options(argc, argv, options, diff_usage, 0);
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if (argc) {
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if (argc > 2)
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usage_with_options(diff_usage, options);
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if (argc == 2) {
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input_old = argv[0];
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input_new = argv[1];
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} else
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input_new = argv[0];
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} else if (symbol_conf.default_guest_vmlinux_name ||
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symbol_conf.default_guest_kallsyms) {
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input_old = "perf.data.host";
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input_new = "perf.data.guest";
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}
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symbol_conf.exclude_other = false;
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if (symbol__init() < 0)
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return -1;
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setup_sorting(diff_usage, options);
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setup_pager();
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sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
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sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
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sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
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return __cmd_diff();
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}
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