perf top: Add callgraph support
Just like in 'perf report', but live. Still needs to decay the callchains, but already somewhat useful as-is. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-cj3rmaf5jpsvi3v0tf7t4uvp@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
ab81f3fd35
commit
19d4ac3c10
@ -126,6 +126,21 @@ Default is to monitor all CPUS.
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--symbols::
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Only consider these symbols.
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-G [type,min,order]::
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--call-graph::
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Display call chains using type, min percent threshold and order.
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type can be either:
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- flat: single column, linear exposure of call chains.
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- graph: use a graph tree, displaying absolute overhead rates.
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- fractal: like graph, but displays relative rates. Each branch of
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the tree is considered as a new profiled object.
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order can be either:
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- callee: callee based call graph.
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- caller: inverted caller based call graph.
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Default: fractal,0.5,callee.
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INTERACTIVE PROMPTING KEYS
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--------------------------
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@ -76,6 +76,12 @@ static bool system_wide = false;
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static bool use_tui, use_stdio;
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static bool sort_has_symbols;
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static bool dont_use_callchains;
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static char callchain_default_opt[] = "fractal,0.5,callee";
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static int default_interval = 0;
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static bool kptr_restrict_warned;
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@ -648,9 +654,11 @@ static void perf_event__process_sample(const union perf_event *event,
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struct perf_sample *sample,
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struct perf_session *session)
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{
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struct symbol *parent = NULL;
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u64 ip = event->ip.ip;
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struct addr_location al;
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struct machine *machine;
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int err;
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u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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++top.samples;
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@ -748,13 +756,29 @@ static void perf_event__process_sample(const union perf_event *event,
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evsel = perf_evlist__id2evsel(top.evlist, sample->id);
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assert(evsel != NULL);
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if ((sort__has_parent || symbol_conf.use_callchain) &&
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sample->callchain) {
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err = perf_session__resolve_callchain(session, al.thread,
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sample->callchain, &parent);
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if (err)
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return;
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}
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he = perf_session__add_hist_entry(session, &al, sample, evsel);
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if (he == NULL) {
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pr_err("Problem incrementing symbol period, skipping event\n");
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return;
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}
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record_precise_ip(he, evsel->idx, ip);
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if (symbol_conf.use_callchain) {
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err = callchain_append(he->callchain, &session->callchain_cursor,
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sample->period);
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if (err)
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return;
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}
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if (sort_has_symbols)
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record_precise_ip(he, evsel->idx, ip);
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}
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return;
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@ -808,6 +832,9 @@ static void start_counters(struct perf_evlist *evlist)
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attr->read_format |= PERF_FORMAT_ID;
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}
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if (symbol_conf.use_callchain)
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attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
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attr->mmap = 1;
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attr->comm = 1;
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attr->inherit = inherit;
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@ -864,10 +891,27 @@ out_err:
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exit(0);
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}
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static int setup_sample_type(void)
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{
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if (!sort_has_symbols) {
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if (symbol_conf.use_callchain) {
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ui__warning("Selected -g but \"sym\" not present in --sort/-s.");
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return -EINVAL;
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}
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} else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
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if (callchain_register_param(&callchain_param) < 0) {
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ui__warning("Can't register callchain params.\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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static int __cmd_top(void)
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{
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pthread_t thread;
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int ret __used;
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int ret;
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/*
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* FIXME: perf_session__new should allow passing a O_MMAP, so that all this
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* mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
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@ -876,6 +920,10 @@ static int __cmd_top(void)
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if (top.session == NULL)
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return -ENOMEM;
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ret = setup_sample_type();
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if (ret)
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goto out_delete;
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if (top.target_tid != -1)
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perf_event__synthesize_thread_map(top.evlist->threads,
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perf_event__process, top.session);
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@ -916,6 +964,90 @@ static int __cmd_top(void)
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ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
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}
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out_delete:
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perf_session__delete(top.session);
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top.session = NULL;
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return 0;
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}
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static int
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parse_callchain_opt(const struct option *opt __used, const char *arg,
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int unset)
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{
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char *tok, *tok2;
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char *endptr;
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/*
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* --no-call-graph
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*/
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if (unset) {
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dont_use_callchains = true;
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return 0;
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}
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symbol_conf.use_callchain = true;
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if (!arg)
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return 0;
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tok = strtok((char *)arg, ",");
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if (!tok)
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return -1;
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/* get the output mode */
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if (!strncmp(tok, "graph", strlen(arg)))
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callchain_param.mode = CHAIN_GRAPH_ABS;
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else if (!strncmp(tok, "flat", strlen(arg)))
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callchain_param.mode = CHAIN_FLAT;
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else if (!strncmp(tok, "fractal", strlen(arg)))
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callchain_param.mode = CHAIN_GRAPH_REL;
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else if (!strncmp(tok, "none", strlen(arg))) {
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callchain_param.mode = CHAIN_NONE;
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symbol_conf.use_callchain = false;
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return 0;
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}
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else
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return -1;
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/* get the min percentage */
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tok = strtok(NULL, ",");
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if (!tok)
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goto setup;
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callchain_param.min_percent = strtod(tok, &endptr);
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if (tok == endptr)
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return -1;
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/* get the print limit */
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tok2 = strtok(NULL, ",");
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if (!tok2)
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goto setup;
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if (tok2[0] != 'c') {
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callchain_param.print_limit = strtod(tok2, &endptr);
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tok2 = strtok(NULL, ",");
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if (!tok2)
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goto setup;
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}
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/* get the call chain order */
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if (!strcmp(tok2, "caller"))
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callchain_param.order = ORDER_CALLER;
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else if (!strcmp(tok2, "callee"))
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callchain_param.order = ORDER_CALLEE;
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else
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return -1;
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setup:
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if (callchain_register_param(&callchain_param) < 0) {
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fprintf(stderr, "Can't register callchain params\n");
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return -1;
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}
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return 0;
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}
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@ -973,6 +1105,10 @@ static const struct option options[] = {
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"sort by key(s): pid, comm, dso, symbol, parent"),
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OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
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"Show a column with the number of samples"),
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OPT_CALLBACK_DEFAULT('G', "call-graph", NULL, "output_type,min_percent, call_order",
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"Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
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"Default: fractal,0.5,callee", &parse_callchain_opt,
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callchain_default_opt),
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OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
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"Show a column with the sum of periods"),
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OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
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@ -1082,6 +1218,12 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
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sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
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sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
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/*
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* Avoid annotation data structures overhead when symbols aren't on the
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* sort list.
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*/
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sort_has_symbols = sort_sym.list.next != NULL;
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get_term_dimensions(&winsize);
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if (top.print_entries == 0) {
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update_print_entries(&winsize);
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