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b5b60fda1e
Pekka Enberg reported weird percentages in perf report. It turns out we are overflowing a 32-bit variables in struct events_stats on 32-bit architectures. Before: [acme@ana linux-2.6-tip]$ perf report -i pekka.perf.data 2> /dev/null | head -10 281.96% Xorg b710a561 [.] 0x000000b710a561 140.15% Xorg [kernel] [k] __initramfs_end 51.56% metacity libgobject-2.0.so.0.2000.1 [.] 0x00000000026e46 35.12% evolution libcairo.so.2.10800.6 [.] 0x000000000203bd 33.84% metacity libpthread-2.9.so [.] 0x00000000007a3d After: [acme@ana linux-2.6-tip]$ perf report -i pekka.perf.data 2> /dev/null | head -10 30.04% Xorg b710a561 [.] 0x000000b710a561 14.93% Xorg [kernel] [k] __initramfs_end 5.49% metacity libgobject-2.0.so.0.2000.1 [.] 0x00000000026e46 3.74% evolution libcairo.so.2.10800.6 [.] 0x000000000203bd 3.61% metacity libpthread-2.9.so [.] 0x00000000007a3d Reported-by: Pekka Enberg <penberg@cs.helsinki.fi> Tested-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1261148583-20395-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
376 lines
10 KiB
C
376 lines
10 KiB
C
/*
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* builtin-report.c
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*
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* Builtin report command: Analyze the perf.data input file,
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* look up and read DSOs and symbol information and display
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* a histogram of results, along various sorting keys.
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*/
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#include "builtin.h"
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#include "util/util.h"
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#include "util/color.h"
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#include <linux/list.h>
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#include "util/cache.h"
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#include <linux/rbtree.h>
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#include "util/symbol.h"
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#include "util/string.h"
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#include "util/callchain.h"
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#include "util/strlist.h"
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#include "util/values.h"
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#include "perf.h"
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#include "util/debug.h"
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#include "util/header.h"
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#include "util/session.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include "util/thread.h"
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#include "util/sort.h"
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#include "util/hist.h"
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static char const *input_name = "perf.data";
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static int force;
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static int show_threads;
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static struct perf_read_values show_threads_values;
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static char default_pretty_printing_style[] = "normal";
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static char *pretty_printing_style = default_pretty_printing_style;
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static char callchain_default_opt[] = "fractal,0.5";
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static int perf_session__add_hist_entry(struct perf_session *self,
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struct addr_location *al,
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struct ip_callchain *chain, u64 count)
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{
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struct symbol **syms = NULL, *parent = NULL;
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bool hit;
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struct hist_entry *he;
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if ((sort__has_parent || symbol_conf.use_callchain) && chain)
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syms = perf_session__resolve_callchain(self, al->thread,
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chain, &parent);
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he = __perf_session__add_hist_entry(self, al, parent, count, &hit);
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if (he == NULL)
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return -ENOMEM;
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if (hit)
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he->count += count;
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if (symbol_conf.use_callchain) {
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if (!hit)
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callchain_init(&he->callchain);
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append_chain(&he->callchain, chain, syms);
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free(syms);
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}
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return 0;
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}
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static int validate_chain(struct ip_callchain *chain, event_t *event)
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{
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unsigned int chain_size;
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chain_size = event->header.size;
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chain_size -= (unsigned long)&event->ip.__more_data - (unsigned long)event;
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if (chain->nr*sizeof(u64) > chain_size)
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return -1;
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return 0;
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}
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static int process_sample_event(event_t *event, struct perf_session *session)
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{
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struct sample_data data = { .period = 1, };
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struct addr_location al;
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event__parse_sample(event, session->sample_type, &data);
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dump_printf("(IP, %d): %d/%d: %p period: %Ld\n",
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event->header.misc,
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data.pid, data.tid,
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(void *)(long)data.ip,
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(long long)data.period);
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if (session->sample_type & PERF_SAMPLE_CALLCHAIN) {
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unsigned int i;
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dump_printf("... chain: nr:%Lu\n", data.callchain->nr);
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if (validate_chain(data.callchain, event) < 0) {
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pr_debug("call-chain problem with event, "
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"skipping it.\n");
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return 0;
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}
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if (dump_trace) {
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for (i = 0; i < data.callchain->nr; i++)
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dump_printf("..... %2d: %016Lx\n",
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i, data.callchain->ips[i]);
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}
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}
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if (event__preprocess_sample(event, session, &al, NULL) < 0) {
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fprintf(stderr, "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)
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return 0;
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if (perf_session__add_hist_entry(session, &al, data.callchain, data.period)) {
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pr_debug("problem incrementing symbol count, skipping event\n");
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return -1;
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}
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session->events_stats.total += data.period;
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return 0;
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}
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static int process_read_event(event_t *event, struct perf_session *session __used)
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{
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struct perf_event_attr *attr;
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attr = perf_header__find_attr(event->read.id, &session->header);
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if (show_threads) {
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const char *name = attr ? __event_name(attr->type, attr->config)
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: "unknown";
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perf_read_values_add_value(&show_threads_values,
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event->read.pid, event->read.tid,
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event->read.id,
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name,
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event->read.value);
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}
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dump_printf(": %d %d %s %Lu\n", event->read.pid, event->read.tid,
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attr ? __event_name(attr->type, attr->config) : "FAIL",
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event->read.value);
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return 0;
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}
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static int sample_type_check(struct perf_session *session)
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{
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if (!(session->sample_type & PERF_SAMPLE_CALLCHAIN)) {
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if (sort__has_parent) {
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fprintf(stderr, "selected --sort parent, but no"
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" callchain data. Did you call"
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" perf record without -g?\n");
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return -1;
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}
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if (symbol_conf.use_callchain) {
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fprintf(stderr, "selected -g but no callchain data."
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" Did you call perf record without"
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" -g?\n");
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return -1;
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}
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} else if (callchain_param.mode != CHAIN_NONE && !symbol_conf.use_callchain) {
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symbol_conf.use_callchain = true;
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if (register_callchain_param(&callchain_param) < 0) {
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fprintf(stderr, "Can't register callchain"
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" params\n");
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return -1;
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}
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}
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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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.process_sample_event = process_sample_event,
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.process_mmap_event = event__process_mmap,
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.process_comm_event = event__process_comm,
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.process_exit_event = event__process_task,
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.process_fork_event = event__process_task,
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.process_lost_event = event__process_lost,
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.process_read_event = process_read_event,
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.sample_type_check = sample_type_check,
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};
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static int __cmd_report(void)
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{
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int ret;
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struct perf_session *session;
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session = perf_session__new(input_name, O_RDONLY, force);
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if (session == NULL)
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return -ENOMEM;
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if (show_threads)
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perf_read_values_init(&show_threads_values);
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ret = perf_session__process_events(session, &event_ops);
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if (ret)
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goto out_delete;
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if (dump_trace) {
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event__print_totals();
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goto out_delete;
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}
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if (verbose > 3)
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perf_session__fprintf(session, stdout);
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if (verbose > 2)
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dsos__fprintf(stdout);
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perf_session__collapse_resort(session);
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perf_session__output_resort(session, session->events_stats.total);
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fprintf(stdout, "# Samples: %Ld\n#\n", session->events_stats.total);
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perf_session__fprintf_hists(session, NULL, false, stdout);
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if (sort_order == default_sort_order &&
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parent_pattern == default_parent_pattern)
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fprintf(stdout, "#\n# (For a higher level overview, try: perf report --sort comm,dso)\n#\n");
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if (show_threads) {
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bool raw_printing_style = !strcmp(pretty_printing_style, "raw");
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perf_read_values_display(stdout, &show_threads_values,
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raw_printing_style);
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perf_read_values_destroy(&show_threads_values);
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}
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out_delete:
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perf_session__delete(session);
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return ret;
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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 __used)
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{
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char *tok;
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char *endptr;
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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 = true;
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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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setup:
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if (register_callchain_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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//static const char * const report_usage[] = {
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const char * const report_usage[] = {
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"perf report [<options>] <command>",
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NULL
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};
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static const struct option options[] = {
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OPT_STRING('i', "input", &input_name, "file",
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"input file name"),
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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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_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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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_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_BOOLEAN('T', "threads", &show_threads,
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"Show per-thread event counters"),
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OPT_STRING(0, "pretty", &pretty_printing_style, "key",
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"pretty printing style key: normal raw"),
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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_BOOLEAN('P', "full-paths", &event_ops.full_paths,
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"Don't shorten the pathnames taking into account the cwd"),
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OPT_STRING('p', "parent", &parent_pattern, "regex",
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"regex filter to identify parent, see: '--sort parent'"),
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OPT_BOOLEAN('x', "exclude-other", &symbol_conf.exclude_other,
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"Only display entries with parent-match"),
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OPT_CALLBACK_DEFAULT('g', "call-graph", NULL, "output_type,min_percent",
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"Display callchains using output_type and min percent threshold. "
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"Default: fractal,0.5", &parse_callchain_opt, callchain_default_opt),
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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('w', "column-widths", &symbol_conf.col_width_list_str,
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"width[,width...]",
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"don't try to adjust column width, use these fixed values"),
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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_END()
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};
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int cmd_report(int argc, const char **argv, const char *prefix __used)
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{
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argc = parse_options(argc, argv, options, report_usage, 0);
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setup_pager();
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if (symbol__init() < 0)
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return -1;
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setup_sorting(report_usage, options);
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if (parent_pattern != default_parent_pattern) {
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sort_dimension__add("parent");
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sort_parent.elide = 1;
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} else
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symbol_conf.exclude_other = false;
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/*
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* Any (unrecognized) arguments left?
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*/
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if (argc)
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usage_with_options(report_usage, options);
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sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
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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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return __cmd_report();
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}
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