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![Ravi Bangoria](/assets/img/avatar_default.png)
perf_event__process_feature() accesses feat_ops[HEADER_LAST_FEATURE]
which is not defined and thus perf is crashing. HEADER_LAST_FEATURE is
used as an end marker for the perf report but it's unused for perf
script/annotate. Ignore HEADER_LAST_FEATURE for perf script/annotate,
just like it is done in 'perf report'.
Before:
# perf record -o - ls | perf script
<SNIP 'ls' output>
Segmentation fault (core dumped)
#
After:
# perf record -o - ls | perf script
<SNIP 'ls' output>
Segmentation fault (core dumped)
ls 7031 4392.099856: 250000 cpu-clock:uhH: 7f5e0ce7cd60
ls 7031 4392.100355: 250000 cpu-clock:uhH: 7f5e0c706ef7
#
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Fixes: 57b5de4639
("perf report: Support forced leader feature in pipe mode")
Link: http://lkml.kernel.org/r/20180625124220.6434-4-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
635 lines
16 KiB
C
635 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* builtin-annotate.c
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*
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* Builtin annotate 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 "perf.h"
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#include "util/debug.h"
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#include "util/evlist.h"
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#include "util/evsel.h"
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#include "util/annotate.h"
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#include "util/event.h"
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#include <subcmd/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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#include "util/session.h"
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#include "util/tool.h"
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#include "util/data.h"
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#include "arch/common.h"
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#include "util/block-range.h"
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#include <dlfcn.h>
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#include <errno.h>
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#include <linux/bitmap.h>
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struct perf_annotate {
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struct perf_tool tool;
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struct perf_session *session;
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struct annotation_options opts;
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bool use_tui, use_stdio, use_stdio2, use_gtk;
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bool skip_missing;
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bool has_br_stack;
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bool group_set;
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const char *sym_hist_filter;
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const char *cpu_list;
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DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
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};
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/*
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* Given one basic block:
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*
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* from to branch_i
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* * ----> *
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* |
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* | block
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* v
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* * ----> *
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* from to branch_i+1
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*
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* where the horizontal are the branches and the vertical is the executed
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* block of instructions.
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*
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* We count, for each 'instruction', the number of blocks that covered it as
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* well as count the ratio each branch is taken.
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*
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* We can do this without knowing the actual instruction stream by keeping
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* track of the address ranges. We break down ranges such that there is no
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* overlap and iterate from the start until the end.
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*
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* @acme: once we parse the objdump output _before_ processing the samples,
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* we can easily fold the branch.cycles IPC bits in.
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*/
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static void process_basic_block(struct addr_map_symbol *start,
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struct addr_map_symbol *end,
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struct branch_flags *flags)
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{
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struct symbol *sym = start->sym;
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struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
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struct block_range_iter iter;
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struct block_range *entry;
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/*
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* Sanity; NULL isn't executable and the CPU cannot execute backwards
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*/
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if (!start->addr || start->addr > end->addr)
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return;
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iter = block_range__create(start->addr, end->addr);
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if (!block_range_iter__valid(&iter))
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return;
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/*
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* First block in range is a branch target.
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*/
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entry = block_range_iter(&iter);
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assert(entry->is_target);
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entry->entry++;
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do {
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entry = block_range_iter(&iter);
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entry->coverage++;
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entry->sym = sym;
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if (notes)
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notes->max_coverage = max(notes->max_coverage, entry->coverage);
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} while (block_range_iter__next(&iter));
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/*
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* Last block in rage is a branch.
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*/
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entry = block_range_iter(&iter);
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assert(entry->is_branch);
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entry->taken++;
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if (flags->predicted)
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entry->pred++;
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}
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static void process_branch_stack(struct branch_stack *bs, struct addr_location *al,
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struct perf_sample *sample)
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{
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struct addr_map_symbol *prev = NULL;
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struct branch_info *bi;
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int i;
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if (!bs || !bs->nr)
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return;
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bi = sample__resolve_bstack(sample, al);
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if (!bi)
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return;
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for (i = bs->nr - 1; i >= 0; i--) {
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/*
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* XXX filter against symbol
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*/
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if (prev)
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process_basic_block(prev, &bi[i].from, &bi[i].flags);
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prev = &bi[i].to;
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}
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free(bi);
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}
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static int hist_iter__branch_callback(struct hist_entry_iter *iter,
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struct addr_location *al __maybe_unused,
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bool single __maybe_unused,
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void *arg __maybe_unused)
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{
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struct hist_entry *he = iter->he;
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struct branch_info *bi;
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struct perf_sample *sample = iter->sample;
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struct perf_evsel *evsel = iter->evsel;
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int err;
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hist__account_cycles(sample->branch_stack, al, sample, false);
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bi = he->branch_info;
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err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
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if (err)
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goto out;
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err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
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out:
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return err;
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}
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static int process_branch_callback(struct perf_evsel *evsel,
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struct perf_sample *sample,
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struct addr_location *al __maybe_unused,
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struct perf_annotate *ann,
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struct machine *machine)
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{
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struct hist_entry_iter iter = {
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.evsel = evsel,
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.sample = sample,
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.add_entry_cb = hist_iter__branch_callback,
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.hide_unresolved = symbol_conf.hide_unresolved,
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.ops = &hist_iter_branch,
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};
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struct addr_location a;
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int ret;
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if (machine__resolve(machine, &a, sample) < 0)
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return -1;
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if (a.sym == NULL)
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return 0;
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if (a.map != NULL)
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a.map->dso->hit = 1;
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ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
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return ret;
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}
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static bool has_annotation(struct perf_annotate *ann)
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{
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return ui__has_annotation() || ann->use_stdio2;
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}
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static int perf_evsel__add_sample(struct perf_evsel *evsel,
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struct perf_sample *sample,
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struct addr_location *al,
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struct perf_annotate *ann,
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struct machine *machine)
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{
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struct hists *hists = evsel__hists(evsel);
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struct hist_entry *he;
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int ret;
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if ((!ann->has_br_stack || !has_annotation(ann)) &&
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ann->sym_hist_filter != NULL &&
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(al->sym == NULL ||
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strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
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/* We're only interested in a symbol named sym_hist_filter */
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/*
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* FIXME: why isn't this done in the symbol_filter when loading
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* the DSO?
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*/
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if (al->sym != NULL) {
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rb_erase(&al->sym->rb_node,
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&al->map->dso->symbols);
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symbol__delete(al->sym);
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dso__reset_find_symbol_cache(al->map->dso);
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}
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return 0;
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}
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/*
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* XXX filtered samples can still have branch entires pointing into our
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* symbol and are missed.
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*/
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process_branch_stack(sample->branch_stack, al, sample);
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if (ann->has_br_stack && has_annotation(ann))
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return process_branch_callback(evsel, sample, al, ann, machine);
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he = hists__add_entry(hists, al, NULL, NULL, NULL, sample, true);
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if (he == NULL)
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return -ENOMEM;
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ret = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
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hists__inc_nr_samples(hists, true);
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return ret;
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}
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static int process_sample_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel,
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struct machine *machine)
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{
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struct perf_annotate *ann = container_of(tool, struct perf_annotate, tool);
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struct addr_location al;
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int ret = 0;
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if (machine__resolve(machine, &al, sample) < 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 (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
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goto out_put;
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if (!al.filtered &&
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perf_evsel__add_sample(evsel, sample, &al, ann, machine)) {
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pr_warning("problem incrementing symbol count, "
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"skipping event\n");
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ret = -1;
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}
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out_put:
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addr_location__put(&al);
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return ret;
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}
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static int process_feature_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_session *session)
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{
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if (event->feat.feat_id < HEADER_LAST_FEATURE)
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return perf_event__process_feature(tool, event, session);
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return 0;
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}
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static int hist_entry__tty_annotate(struct hist_entry *he,
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struct perf_evsel *evsel,
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struct perf_annotate *ann)
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{
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if (!ann->use_stdio2)
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return symbol__tty_annotate(he->ms.sym, he->ms.map, evsel, &ann->opts);
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return symbol__tty_annotate2(he->ms.sym, he->ms.map, evsel, &ann->opts);
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}
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static void hists__find_annotations(struct hists *hists,
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struct perf_evsel *evsel,
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struct perf_annotate *ann)
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{
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struct rb_node *nd = rb_first(&hists->entries), *next;
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int key = K_RIGHT;
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while (nd) {
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struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
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struct annotation *notes;
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if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
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goto find_next;
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if (ann->sym_hist_filter &&
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(strcmp(he->ms.sym->name, ann->sym_hist_filter) != 0))
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goto find_next;
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notes = symbol__annotation(he->ms.sym);
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if (notes->src == NULL) {
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find_next:
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if (key == K_LEFT)
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nd = rb_prev(nd);
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else
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nd = rb_next(nd);
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continue;
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}
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if (use_browser == 2) {
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int ret;
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int (*annotate)(struct hist_entry *he,
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struct perf_evsel *evsel,
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struct hist_browser_timer *hbt);
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annotate = dlsym(perf_gtk_handle,
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"hist_entry__gtk_annotate");
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if (annotate == NULL) {
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ui__error("GTK browser not found!\n");
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return;
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}
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ret = annotate(he, evsel, NULL);
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if (!ret || !ann->skip_missing)
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return;
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/* skip missing symbols */
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nd = rb_next(nd);
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} else if (use_browser == 1) {
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key = hist_entry__tui_annotate(he, evsel, NULL, &ann->opts);
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switch (key) {
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case -1:
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if (!ann->skip_missing)
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return;
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/* fall through */
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case K_RIGHT:
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next = rb_next(nd);
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break;
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case K_LEFT:
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next = rb_prev(nd);
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break;
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default:
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return;
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}
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if (next != NULL)
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nd = next;
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} else {
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hist_entry__tty_annotate(he, evsel, ann);
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nd = rb_next(nd);
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/*
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* Since we have a hist_entry per IP for the same
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* symbol, free he->ms.sym->src to signal we already
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* processed this symbol.
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*/
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zfree(¬es->src->cycles_hist);
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zfree(¬es->src);
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}
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}
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}
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static int __cmd_annotate(struct perf_annotate *ann)
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{
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int ret;
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struct perf_session *session = ann->session;
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struct perf_evsel *pos;
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u64 total_nr_samples;
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if (ann->cpu_list) {
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ret = perf_session__cpu_bitmap(session, ann->cpu_list,
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ann->cpu_bitmap);
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if (ret)
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goto out;
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}
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if (!ann->opts.objdump_path) {
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ret = perf_env__lookup_objdump(&session->header.env,
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&ann->opts.objdump_path);
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if (ret)
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goto out;
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}
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ret = perf_session__process_events(session);
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if (ret)
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goto out;
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if (dump_trace) {
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perf_session__fprintf_nr_events(session, stdout);
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perf_evlist__fprintf_nr_events(session->evlist, stdout);
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goto out;
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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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perf_session__fprintf_dsos(session, stdout);
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total_nr_samples = 0;
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evlist__for_each_entry(session->evlist, pos) {
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struct hists *hists = evsel__hists(pos);
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u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
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if (nr_samples > 0) {
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total_nr_samples += nr_samples;
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hists__collapse_resort(hists, NULL);
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/* Don't sort callchain */
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perf_evsel__reset_sample_bit(pos, CALLCHAIN);
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perf_evsel__output_resort(pos, NULL);
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if (symbol_conf.event_group &&
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!perf_evsel__is_group_leader(pos))
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continue;
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hists__find_annotations(hists, pos, ann);
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}
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}
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if (total_nr_samples == 0) {
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ui__error("The %s file has no samples!\n", session->data->file.path);
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goto out;
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}
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if (use_browser == 2) {
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void (*show_annotations)(void);
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show_annotations = dlsym(perf_gtk_handle,
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"perf_gtk__show_annotations");
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if (show_annotations == NULL) {
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ui__error("GTK browser not found!\n");
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goto out;
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}
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show_annotations();
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}
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out:
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return ret;
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}
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static const char * const annotate_usage[] = {
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"perf annotate [<options>]",
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NULL
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};
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int cmd_annotate(int argc, const char **argv)
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{
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struct perf_annotate annotate = {
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.tool = {
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.sample = process_sample_event,
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.mmap = perf_event__process_mmap,
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.mmap2 = perf_event__process_mmap2,
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.comm = perf_event__process_comm,
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.exit = perf_event__process_exit,
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.fork = perf_event__process_fork,
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.namespaces = perf_event__process_namespaces,
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.attr = perf_event__process_attr,
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.build_id = perf_event__process_build_id,
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.tracing_data = perf_event__process_tracing_data,
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.feature = process_feature_event,
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.ordered_events = true,
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.ordering_requires_timestamps = true,
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},
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.opts = annotation__default_options,
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};
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struct perf_data data = {
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.mode = PERF_DATA_MODE_READ,
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};
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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_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('s', "symbol", &annotate.sym_hist_filter, "symbol",
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"symbol to annotate"),
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OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"),
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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('q', "quiet", &quiet, "do now show any message"),
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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(0, "gtk", &annotate.use_gtk, "Use the GTK interface"),
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OPT_BOOLEAN(0, "tui", &annotate.use_tui, "Use the TUI interface"),
|
|
OPT_BOOLEAN(0, "stdio", &annotate.use_stdio, "Use the stdio interface"),
|
|
OPT_BOOLEAN(0, "stdio2", &annotate.use_stdio2, "Use the stdio interface"),
|
|
OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
|
|
"don't load vmlinux even if found"),
|
|
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
|
|
"file", "vmlinux pathname"),
|
|
OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
|
|
"load module symbols - WARNING: use only with -k and LIVE kernel"),
|
|
OPT_BOOLEAN('l', "print-line", &annotate.opts.print_lines,
|
|
"print matching source lines (may be slow)"),
|
|
OPT_BOOLEAN('P', "full-paths", &annotate.opts.full_path,
|
|
"Don't shorten the displayed pathnames"),
|
|
OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
|
|
"Skip symbols that cannot be annotated"),
|
|
OPT_BOOLEAN_SET(0, "group", &symbol_conf.event_group,
|
|
&annotate.group_set,
|
|
"Show event group information together"),
|
|
OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
|
|
OPT_CALLBACK(0, "symfs", NULL, "directory",
|
|
"Look for files with symbols relative to this directory",
|
|
symbol__config_symfs),
|
|
OPT_BOOLEAN(0, "source", &annotate.opts.annotate_src,
|
|
"Interleave source code with assembly code (default)"),
|
|
OPT_BOOLEAN(0, "asm-raw", &annotate.opts.show_asm_raw,
|
|
"Display raw encoding of assembly instructions (default)"),
|
|
OPT_STRING('M', "disassembler-style", &annotate.opts.disassembler_style, "disassembler style",
|
|
"Specify disassembler style (e.g. -M intel for intel syntax)"),
|
|
OPT_STRING(0, "objdump", &annotate.opts.objdump_path, "path",
|
|
"objdump binary to use for disassembly and annotations"),
|
|
OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
|
|
"Show event group information together"),
|
|
OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
|
|
"Show a column with the sum of periods"),
|
|
OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
|
|
"Show a column with the number of samples"),
|
|
OPT_CALLBACK_DEFAULT(0, "stdio-color", NULL, "mode",
|
|
"'always' (default), 'never' or 'auto' only applicable to --stdio mode",
|
|
stdio__config_color, "always"),
|
|
OPT_END()
|
|
};
|
|
int ret;
|
|
|
|
set_option_flag(options, 0, "show-total-period", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 0, "show-nr-samples", PARSE_OPT_EXCLUSIVE);
|
|
|
|
|
|
ret = hists__init();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
argc = parse_options(argc, argv, options, annotate_usage, 0);
|
|
if (argc) {
|
|
/*
|
|
* Special case: if there's an argument left then assume that
|
|
* it's a symbol filter:
|
|
*/
|
|
if (argc > 1)
|
|
usage_with_options(annotate_usage, options);
|
|
|
|
annotate.sym_hist_filter = argv[0];
|
|
}
|
|
|
|
if (symbol_conf.show_nr_samples && annotate.use_gtk) {
|
|
pr_err("--show-nr-samples is not available in --gtk mode at this time\n");
|
|
return ret;
|
|
}
|
|
|
|
if (quiet)
|
|
perf_quiet_option();
|
|
|
|
data.file.path = input_name;
|
|
|
|
annotate.session = perf_session__new(&data, false, &annotate.tool);
|
|
if (annotate.session == NULL)
|
|
return -1;
|
|
|
|
annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
|
|
HEADER_BRANCH_STACK);
|
|
|
|
if (annotate.group_set)
|
|
perf_evlist__force_leader(annotate.session->evlist);
|
|
|
|
ret = symbol__annotation_init();
|
|
if (ret < 0)
|
|
goto out_delete;
|
|
|
|
annotation_config__init();
|
|
|
|
symbol_conf.try_vmlinux_path = true;
|
|
|
|
ret = symbol__init(&annotate.session->header.env);
|
|
if (ret < 0)
|
|
goto out_delete;
|
|
|
|
if (annotate.use_stdio || annotate.use_stdio2)
|
|
use_browser = 0;
|
|
else if (annotate.use_tui)
|
|
use_browser = 1;
|
|
else if (annotate.use_gtk)
|
|
use_browser = 2;
|
|
|
|
setup_browser(true);
|
|
|
|
if ((use_browser == 1 || annotate.use_stdio2) && annotate.has_br_stack) {
|
|
sort__mode = SORT_MODE__BRANCH;
|
|
if (setup_sorting(annotate.session->evlist) < 0)
|
|
usage_with_options(annotate_usage, options);
|
|
} else {
|
|
if (setup_sorting(NULL) < 0)
|
|
usage_with_options(annotate_usage, options);
|
|
}
|
|
|
|
ret = __cmd_annotate(&annotate);
|
|
|
|
out_delete:
|
|
/*
|
|
* Speed up the exit process, for large files this can
|
|
* take quite a while.
|
|
*
|
|
* XXX Enable this when using valgrind or if we ever
|
|
* librarize this command.
|
|
*
|
|
* Also experiment with obstacks to see how much speed
|
|
* up we'll get here.
|
|
*
|
|
* perf_session__delete(session);
|
|
*/
|
|
return ret;
|
|
}
|