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162f0befda
This way we can later delimit a lifecycle for the COMM and map a hist to a precise COMM:timeslice couple. PERF_RECORD_COMM and PERF_RECORD_FORK events that don't have PERF_SAMPLE_TIME samples can only send 0 value as a timestamp and thus should overwrite any previous COMM on a given thread because there is no sensible way to keep track of all the comms lifecycles in a thread without time informations. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Tested-by: Jiri Olsa <jolsa@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-6tyow99vgmmtt9qwr2u2lqd7@git.kernel.org [ Made it cope with PERF_RECORD_MMAP2 ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
500 lines
11 KiB
C
500 lines
11 KiB
C
#include "perf.h"
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#include "tests.h"
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#include "debug.h"
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#include "symbol.h"
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#include "sort.h"
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#include "evsel.h"
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#include "evlist.h"
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#include "machine.h"
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#include "thread.h"
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#include "parse-events.h"
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static struct {
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u32 pid;
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const char *comm;
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} fake_threads[] = {
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{ 100, "perf" },
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{ 200, "perf" },
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{ 300, "bash" },
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};
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static struct {
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u32 pid;
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u64 start;
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const char *filename;
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} fake_mmap_info[] = {
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{ 100, 0x40000, "perf" },
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{ 100, 0x50000, "libc" },
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{ 100, 0xf0000, "[kernel]" },
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{ 200, 0x40000, "perf" },
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{ 200, 0x50000, "libc" },
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{ 200, 0xf0000, "[kernel]" },
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{ 300, 0x40000, "bash" },
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{ 300, 0x50000, "libc" },
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{ 300, 0xf0000, "[kernel]" },
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};
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struct fake_sym {
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u64 start;
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u64 length;
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const char *name;
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};
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static struct fake_sym perf_syms[] = {
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{ 700, 100, "main" },
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{ 800, 100, "run_command" },
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{ 900, 100, "cmd_record" },
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};
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static struct fake_sym bash_syms[] = {
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{ 700, 100, "main" },
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{ 800, 100, "xmalloc" },
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{ 900, 100, "xfree" },
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};
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static struct fake_sym libc_syms[] = {
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{ 700, 100, "malloc" },
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{ 800, 100, "free" },
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{ 900, 100, "realloc" },
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};
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static struct fake_sym kernel_syms[] = {
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{ 700, 100, "schedule" },
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{ 800, 100, "page_fault" },
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{ 900, 100, "sys_perf_event_open" },
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};
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static struct {
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const char *dso_name;
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struct fake_sym *syms;
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size_t nr_syms;
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} fake_symbols[] = {
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{ "perf", perf_syms, ARRAY_SIZE(perf_syms) },
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{ "bash", bash_syms, ARRAY_SIZE(bash_syms) },
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{ "libc", libc_syms, ARRAY_SIZE(libc_syms) },
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{ "[kernel]", kernel_syms, ARRAY_SIZE(kernel_syms) },
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};
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static struct machine *setup_fake_machine(struct machines *machines)
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{
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struct machine *machine = machines__find(machines, HOST_KERNEL_ID);
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size_t i;
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if (machine == NULL) {
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pr_debug("Not enough memory for machine setup\n");
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return NULL;
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}
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for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
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struct thread *thread;
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thread = machine__findnew_thread(machine, fake_threads[i].pid,
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fake_threads[i].pid);
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if (thread == NULL)
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goto out;
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thread__set_comm(thread, fake_threads[i].comm, 0);
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}
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for (i = 0; i < ARRAY_SIZE(fake_mmap_info); i++) {
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union perf_event fake_mmap_event = {
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.mmap = {
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.header = { .misc = PERF_RECORD_MISC_USER, },
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.pid = fake_mmap_info[i].pid,
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.start = fake_mmap_info[i].start,
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.len = 0x1000ULL,
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.pgoff = 0ULL,
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},
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};
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strcpy(fake_mmap_event.mmap.filename,
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fake_mmap_info[i].filename);
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machine__process_mmap_event(machine, &fake_mmap_event, NULL);
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}
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for (i = 0; i < ARRAY_SIZE(fake_symbols); i++) {
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size_t k;
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struct dso *dso;
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dso = __dsos__findnew(&machine->user_dsos,
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fake_symbols[i].dso_name);
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if (dso == NULL)
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goto out;
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/* emulate dso__load() */
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dso__set_loaded(dso, MAP__FUNCTION);
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for (k = 0; k < fake_symbols[i].nr_syms; k++) {
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struct symbol *sym;
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struct fake_sym *fsym = &fake_symbols[i].syms[k];
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sym = symbol__new(fsym->start, fsym->length,
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STB_GLOBAL, fsym->name);
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if (sym == NULL)
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goto out;
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symbols__insert(&dso->symbols[MAP__FUNCTION], sym);
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}
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}
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return machine;
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out:
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pr_debug("Not enough memory for machine setup\n");
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machine__delete_threads(machine);
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machine__delete(machine);
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return NULL;
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}
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struct sample {
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u32 pid;
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u64 ip;
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struct thread *thread;
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struct map *map;
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struct symbol *sym;
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};
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static struct sample fake_common_samples[] = {
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/* perf [kernel] schedule() */
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{ .pid = 100, .ip = 0xf0000 + 700, },
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/* perf [perf] main() */
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{ .pid = 200, .ip = 0x40000 + 700, },
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/* perf [perf] cmd_record() */
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{ .pid = 200, .ip = 0x40000 + 900, },
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/* bash [bash] xmalloc() */
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{ .pid = 300, .ip = 0x40000 + 800, },
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/* bash [libc] malloc() */
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{ .pid = 300, .ip = 0x50000 + 700, },
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};
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static struct sample fake_samples[][5] = {
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{
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/* perf [perf] run_command() */
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{ .pid = 100, .ip = 0x40000 + 800, },
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/* perf [libc] malloc() */
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{ .pid = 100, .ip = 0x50000 + 700, },
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/* perf [kernel] page_fault() */
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{ .pid = 100, .ip = 0xf0000 + 800, },
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/* perf [kernel] sys_perf_event_open() */
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{ .pid = 200, .ip = 0xf0000 + 900, },
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/* bash [libc] free() */
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{ .pid = 300, .ip = 0x50000 + 800, },
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},
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{
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/* perf [libc] free() */
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{ .pid = 200, .ip = 0x50000 + 800, },
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/* bash [libc] malloc() */
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{ .pid = 300, .ip = 0x50000 + 700, }, /* will be merged */
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/* bash [bash] xfee() */
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{ .pid = 300, .ip = 0x40000 + 900, },
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/* bash [libc] realloc() */
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{ .pid = 300, .ip = 0x50000 + 900, },
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/* bash [kernel] page_fault() */
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{ .pid = 300, .ip = 0xf0000 + 800, },
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},
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};
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static int add_hist_entries(struct perf_evlist *evlist, struct machine *machine)
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{
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struct perf_evsel *evsel;
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struct addr_location al;
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struct hist_entry *he;
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struct perf_sample sample = { .cpu = 0, };
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size_t i = 0, k;
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/*
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* each evsel will have 10 samples - 5 common and 5 distinct.
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* However the second evsel also has a collapsed entry for
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* "bash [libc] malloc" so total 9 entries will be in the tree.
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*/
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list_for_each_entry(evsel, &evlist->entries, node) {
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for (k = 0; k < ARRAY_SIZE(fake_common_samples); k++) {
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const union perf_event event = {
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.header = {
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.misc = PERF_RECORD_MISC_USER,
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},
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};
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sample.pid = fake_common_samples[k].pid;
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sample.ip = fake_common_samples[k].ip;
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if (perf_event__preprocess_sample(&event, machine, &al,
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&sample) < 0)
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goto out;
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he = __hists__add_entry(&evsel->hists, &al, NULL,
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1, 1, 0);
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if (he == NULL)
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goto out;
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fake_common_samples[k].thread = al.thread;
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fake_common_samples[k].map = al.map;
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fake_common_samples[k].sym = al.sym;
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}
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for (k = 0; k < ARRAY_SIZE(fake_samples[i]); k++) {
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const union perf_event event = {
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.header = {
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.misc = PERF_RECORD_MISC_USER,
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},
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};
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sample.pid = fake_samples[i][k].pid;
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sample.ip = fake_samples[i][k].ip;
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if (perf_event__preprocess_sample(&event, machine, &al,
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&sample) < 0)
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goto out;
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he = __hists__add_entry(&evsel->hists, &al, NULL, 1, 1,
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0);
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if (he == NULL)
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goto out;
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fake_samples[i][k].thread = al.thread;
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fake_samples[i][k].map = al.map;
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fake_samples[i][k].sym = al.sym;
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}
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i++;
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}
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return 0;
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out:
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pr_debug("Not enough memory for adding a hist entry\n");
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return -1;
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}
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static int find_sample(struct sample *samples, size_t nr_samples,
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struct thread *t, struct map *m, struct symbol *s)
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{
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while (nr_samples--) {
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if (samples->thread == t && samples->map == m &&
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samples->sym == s)
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return 1;
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samples++;
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}
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return 0;
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}
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static int __validate_match(struct hists *hists)
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{
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size_t count = 0;
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struct rb_root *root;
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struct rb_node *node;
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/*
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* Only entries from fake_common_samples should have a pair.
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*/
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if (sort__need_collapse)
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root = &hists->entries_collapsed;
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else
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root = hists->entries_in;
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node = rb_first(root);
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while (node) {
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struct hist_entry *he;
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he = rb_entry(node, struct hist_entry, rb_node_in);
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if (hist_entry__has_pairs(he)) {
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if (find_sample(fake_common_samples,
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ARRAY_SIZE(fake_common_samples),
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he->thread, he->ms.map, he->ms.sym)) {
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count++;
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} else {
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pr_debug("Can't find the matched entry\n");
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return -1;
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}
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}
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node = rb_next(node);
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}
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if (count != ARRAY_SIZE(fake_common_samples)) {
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pr_debug("Invalid count for matched entries: %zd of %zd\n",
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count, ARRAY_SIZE(fake_common_samples));
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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 int validate_match(struct hists *leader, struct hists *other)
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{
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return __validate_match(leader) || __validate_match(other);
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}
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static int __validate_link(struct hists *hists, int idx)
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{
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size_t count = 0;
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size_t count_pair = 0;
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size_t count_dummy = 0;
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struct rb_root *root;
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struct rb_node *node;
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/*
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* Leader hists (idx = 0) will have dummy entries from other,
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* and some entries will have no pair. However every entry
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* in other hists should have (dummy) pair.
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*/
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if (sort__need_collapse)
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root = &hists->entries_collapsed;
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else
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root = hists->entries_in;
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node = rb_first(root);
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while (node) {
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struct hist_entry *he;
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he = rb_entry(node, struct hist_entry, rb_node_in);
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if (hist_entry__has_pairs(he)) {
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if (!find_sample(fake_common_samples,
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ARRAY_SIZE(fake_common_samples),
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he->thread, he->ms.map, he->ms.sym) &&
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!find_sample(fake_samples[idx],
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ARRAY_SIZE(fake_samples[idx]),
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he->thread, he->ms.map, he->ms.sym)) {
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count_dummy++;
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}
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count_pair++;
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} else if (idx) {
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pr_debug("A entry from the other hists should have pair\n");
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return -1;
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}
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count++;
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node = rb_next(node);
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}
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/*
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* Note that we have a entry collapsed in the other (idx = 1) hists.
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*/
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if (idx == 0) {
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if (count_dummy != ARRAY_SIZE(fake_samples[1]) - 1) {
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pr_debug("Invalid count of dummy entries: %zd of %zd\n",
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count_dummy, ARRAY_SIZE(fake_samples[1]) - 1);
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return -1;
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}
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if (count != count_pair + ARRAY_SIZE(fake_samples[0])) {
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pr_debug("Invalid count of total leader entries: %zd of %zd\n",
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count, count_pair + ARRAY_SIZE(fake_samples[0]));
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return -1;
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}
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} else {
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if (count != count_pair) {
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pr_debug("Invalid count of total other entries: %zd of %zd\n",
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count, count_pair);
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return -1;
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}
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if (count_dummy > 0) {
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pr_debug("Other hists should not have dummy entries: %zd\n",
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count_dummy);
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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 int validate_link(struct hists *leader, struct hists *other)
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{
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return __validate_link(leader, 0) || __validate_link(other, 1);
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}
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static void print_hists(struct hists *hists)
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{
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int i = 0;
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struct rb_root *root;
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struct rb_node *node;
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if (sort__need_collapse)
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root = &hists->entries_collapsed;
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else
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root = hists->entries_in;
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pr_info("----- %s --------\n", __func__);
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node = rb_first(root);
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while (node) {
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struct hist_entry *he;
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he = rb_entry(node, struct hist_entry, rb_node_in);
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pr_info("%2d: entry: %-8s [%-8s] %20s: period = %"PRIu64"\n",
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i, thread__comm_str(he->thread), he->ms.map->dso->short_name,
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he->ms.sym->name, he->stat.period);
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i++;
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node = rb_next(node);
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}
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}
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int test__hists_link(void)
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{
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int err = -1;
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struct machines machines;
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struct machine *machine = NULL;
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struct perf_evsel *evsel, *first;
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struct perf_evlist *evlist = perf_evlist__new();
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if (evlist == NULL)
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return -ENOMEM;
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err = parse_events(evlist, "cpu-clock");
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if (err)
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goto out;
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err = parse_events(evlist, "task-clock");
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if (err)
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goto out;
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/* default sort order (comm,dso,sym) will be used */
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if (setup_sorting() < 0)
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goto out;
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machines__init(&machines);
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/* setup threads/dso/map/symbols also */
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machine = setup_fake_machine(&machines);
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if (!machine)
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goto out;
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if (verbose > 1)
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machine__fprintf(machine, stderr);
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/* process sample events */
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err = add_hist_entries(evlist, machine);
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if (err < 0)
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goto out;
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list_for_each_entry(evsel, &evlist->entries, node) {
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hists__collapse_resort(&evsel->hists, NULL);
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if (verbose > 2)
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print_hists(&evsel->hists);
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}
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first = perf_evlist__first(evlist);
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evsel = perf_evlist__last(evlist);
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/* match common entries */
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hists__match(&first->hists, &evsel->hists);
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err = validate_match(&first->hists, &evsel->hists);
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if (err)
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goto out;
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/* link common and/or dummy entries */
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hists__link(&first->hists, &evsel->hists);
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err = validate_link(&first->hists, &evsel->hists);
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if (err)
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goto out;
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err = 0;
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out:
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/* tear down everything */
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perf_evlist__delete(evlist);
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machines__exit(&machines);
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return err;
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}
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