Root/tools/perf/builtin-diff.c

1/*
2 * builtin-diff.c
3 *
4 * Builtin diff command: Analyze two perf.data input files, look up and read
5 * DSOs and symbol information, sort them and produce a diff.
6 */
7#include "builtin.h"
8
9#include "util/debug.h"
10#include "util/event.h"
11#include "util/hist.h"
12#include "util/evsel.h"
13#include "util/session.h"
14#include "util/tool.h"
15#include "util/sort.h"
16#include "util/symbol.h"
17#include "util/util.h"
18
19#include <stdlib.h>
20
21static char const *input_old = "perf.data.old",
22          *input_new = "perf.data";
23static char diff__default_sort_order[] = "dso,symbol";
24static bool force;
25static bool show_displacement;
26
27struct perf_diff {
28    struct perf_tool tool;
29    struct perf_session *session;
30};
31
32static int hists__add_entry(struct hists *self,
33                struct addr_location *al, u64 period)
34{
35    if (__hists__add_entry(self, al, NULL, period) != NULL)
36        return 0;
37    return -ENOMEM;
38}
39
40static int diff__process_sample_event(struct perf_tool *tool,
41                      union perf_event *event,
42                      struct perf_sample *sample,
43                      struct perf_evsel *evsel __used,
44                      struct machine *machine)
45{
46    struct perf_diff *_diff = container_of(tool, struct perf_diff, tool);
47    struct perf_session *session = _diff->session;
48    struct addr_location al;
49
50    if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
51        pr_warning("problem processing %d event, skipping it.\n",
52               event->header.type);
53        return -1;
54    }
55
56    if (al.filtered || al.sym == NULL)
57        return 0;
58
59    if (hists__add_entry(&session->hists, &al, sample->period)) {
60        pr_warning("problem incrementing symbol period, skipping event\n");
61        return -1;
62    }
63
64    session->hists.stats.total_period += sample->period;
65    return 0;
66}
67
68static struct perf_diff diff = {
69    .tool = {
70        .sample = diff__process_sample_event,
71        .mmap = perf_event__process_mmap,
72        .comm = perf_event__process_comm,
73        .exit = perf_event__process_task,
74        .fork = perf_event__process_task,
75        .lost = perf_event__process_lost,
76        .ordered_samples = true,
77        .ordering_requires_timestamps = true,
78    },
79};
80
81static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
82                            struct hist_entry *he)
83{
84    struct rb_node **p = &root->rb_node;
85    struct rb_node *parent = NULL;
86    struct hist_entry *iter;
87
88    while (*p != NULL) {
89        parent = *p;
90        iter = rb_entry(parent, struct hist_entry, rb_node);
91        if (hist_entry__cmp(he, iter) < 0)
92            p = &(*p)->rb_left;
93        else
94            p = &(*p)->rb_right;
95    }
96
97    rb_link_node(&he->rb_node, parent, p);
98    rb_insert_color(&he->rb_node, root);
99}
100
101static void hists__resort_entries(struct hists *self)
102{
103    unsigned long position = 1;
104    struct rb_root tmp = RB_ROOT;
105    struct rb_node *next = rb_first(&self->entries);
106
107    while (next != NULL) {
108        struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
109
110        next = rb_next(&n->rb_node);
111        rb_erase(&n->rb_node, &self->entries);
112        n->position = position++;
113        perf_session__insert_hist_entry_by_name(&tmp, n);
114    }
115
116    self->entries = tmp;
117}
118
119static struct hist_entry *hists__find_entry(struct hists *self,
120                        struct hist_entry *he)
121{
122    struct rb_node *n = self->entries.rb_node;
123
124    while (n) {
125        struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
126        int64_t cmp = hist_entry__cmp(he, iter);
127
128        if (cmp < 0)
129            n = n->rb_left;
130        else if (cmp > 0)
131            n = n->rb_right;
132        else
133            return iter;
134    }
135
136    return NULL;
137}
138
139static void hists__match(struct hists *older, struct hists *newer)
140{
141    struct rb_node *nd;
142
143    for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
144        struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
145        pos->pair = hists__find_entry(older, pos);
146    }
147}
148
149static int __cmd_diff(void)
150{
151    int ret, i;
152#define older (session[0])
153#define newer (session[1])
154    struct perf_session *session[2];
155
156    older = perf_session__new(input_old, O_RDONLY, force, false,
157                  &diff.tool);
158    newer = perf_session__new(input_new, O_RDONLY, force, false,
159                  &diff.tool);
160    if (session[0] == NULL || session[1] == NULL)
161        return -ENOMEM;
162
163    for (i = 0; i < 2; ++i) {
164        diff.session = session[i];
165        ret = perf_session__process_events(session[i], &diff.tool);
166        if (ret)
167            goto out_delete;
168        hists__output_resort(&session[i]->hists);
169    }
170
171    if (show_displacement)
172        hists__resort_entries(&older->hists);
173
174    hists__match(&older->hists, &newer->hists);
175    hists__fprintf(&newer->hists, &older->hists,
176               show_displacement, true, 0, 0, stdout);
177out_delete:
178    for (i = 0; i < 2; ++i)
179        perf_session__delete(session[i]);
180    return ret;
181#undef older
182#undef newer
183}
184
185static const char * const diff_usage[] = {
186    "perf diff [<options>] [old_file] [new_file]",
187    NULL,
188};
189
190static const struct option options[] = {
191    OPT_INCR('v', "verbose", &verbose,
192            "be more verbose (show symbol address, etc)"),
193    OPT_BOOLEAN('M', "displacement", &show_displacement,
194            "Show position displacement relative to baseline"),
195    OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
196            "dump raw trace in ASCII"),
197    OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
198    OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
199            "load module symbols - WARNING: use only with -k and LIVE kernel"),
200    OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
201           "only consider symbols in these dsos"),
202    OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
203           "only consider symbols in these comms"),
204    OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
205           "only consider these symbols"),
206    OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
207           "sort by key(s): pid, comm, dso, symbol, parent"),
208    OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
209           "separator for columns, no spaces will be added between "
210           "columns '.' is reserved."),
211    OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
212            "Look for files with symbols relative to this directory"),
213    OPT_END()
214};
215
216int cmd_diff(int argc, const char **argv, const char *prefix __used)
217{
218    sort_order = diff__default_sort_order;
219    argc = parse_options(argc, argv, options, diff_usage, 0);
220    if (argc) {
221        if (argc > 2)
222            usage_with_options(diff_usage, options);
223        if (argc == 2) {
224            input_old = argv[0];
225            input_new = argv[1];
226        } else
227            input_new = argv[0];
228    } else if (symbol_conf.default_guest_vmlinux_name ||
229           symbol_conf.default_guest_kallsyms) {
230        input_old = "perf.data.host";
231        input_new = "perf.data.guest";
232    }
233
234    symbol_conf.exclude_other = false;
235    if (symbol__init() < 0)
236        return -1;
237
238    setup_sorting(diff_usage, options);
239    setup_pager();
240
241    sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
242    sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
243    sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
244
245    return __cmd_diff();
246}
247

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