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SubjectRe: [PATCH RFC] perf: Go back to by-hand proc mmap parsing and kill timeout
Em Tue, Oct 30, 2018 at 10:54:16PM -0700, David Miller escreveu:
>
> This goes back to by-hand parsing of the proc mmap file, and removes
> the timeout.
>
> In my measurements this makes the parsing about twice as fast.
>
> Profiling thread synthesizing shows that most of the time is spent in
> the sscanf() call.
>
> Processing samples is critical for perf top and perf record -a startup
> performance, and perf's ability to keep up with high sample rates.

I'm going to split this patch into two, one that makes it go back to
by-hand proc mmap parsing, and the other killing the mmap-timeout.

Thanks,

- Arnaldo

> Signed-off-by: David S. Miller <davem@davemloft.net>
>
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 2b1ef704169f..d4b5177c3c22 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1364,8 +1364,6 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
> "show events other than"
> " HLT (x86 only) or Wait state (s390 only)"
> " that take longer than duration usecs"),
> - OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
> - "per thread proc mmap processing timeout in ms"),
> OPT_END()
> };
> const char * const live_usage[] = {
> @@ -1394,7 +1392,6 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
> kvm->opts.target.uses_mmap = false;
> kvm->opts.target.uid_str = NULL;
> kvm->opts.target.uid = UINT_MAX;
> - kvm->opts.proc_map_timeout = 500;
>
> symbol__init(NULL);
> disable_buildid_cache();
> @@ -1453,8 +1450,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
> perf_session__set_id_hdr_size(kvm->session);
> ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
> machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
> - kvm->evlist->threads, false,
> - kvm->opts.proc_map_timeout, 1);
> + kvm->evlist->threads, false, 1);
> err = kvm_live_open_events(kvm);
> if (err)
> goto out;
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 0980dfe3396b..4259ea42a8ef 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -633,8 +633,7 @@ static int record__synthesize_workload(struct record *rec, bool tail)
> err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
> process_synthesized_event,
> &rec->session->machines.host,
> - rec->opts.sample_address,
> - rec->opts.proc_map_timeout);
> + rec->opts.sample_address);
> thread_map__put(thread_map);
> return err;
> }
> @@ -848,8 +847,7 @@ static int record__synthesize(struct record *rec, bool tail)
> }
>
> err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
> - process_synthesized_event, opts->sample_address,
> - opts->proc_map_timeout, 1);
> + process_synthesized_event, opts->sample_address, 1);
> out:
> return err;
> }
> @@ -1521,7 +1519,6 @@ static struct record record = {
> .uses_mmap = true,
> .default_per_cpu = true,
> },
> - .proc_map_timeout = 500,
> },
> .tool = {
> .sample = process_sample_event,
> @@ -1651,8 +1648,6 @@ static struct option __record_options[] = {
> parse_clockid),
> OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
> "opts", "AUX area tracing Snapshot Mode", ""),
> - OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
> - "per thread proc mmap processing timeout in ms"),
> OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
> "Record namespaces events"),
> OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index d21d8751e749..4eec44d815bd 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -1096,7 +1096,6 @@ static int __cmd_top(struct perf_top *top)
>
> machine__synthesize_threads(&top->session->machines.host, &opts->target,
> top->evlist->threads, false,
> - opts->proc_map_timeout,
> top->nr_threads_synthesize);
>
> if (top->nr_threads_synthesize > 1)
> @@ -1256,7 +1255,6 @@ int cmd_top(int argc, const char **argv)
> .target = {
> .uses_mmap = true,
> },
> - .proc_map_timeout = 500,
> .overwrite = 1,
> },
> .max_stack = sysctl__max_stack(),
> @@ -1360,8 +1358,6 @@ int cmd_top(int argc, const char **argv)
> OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
> "width[,width...]",
> "don't try to adjust column width, use these fixed values"),
> - OPT_UINTEGER(0, "proc-map-timeout", &opts->proc_map_timeout,
> - "per thread proc mmap processing timeout in ms"),
> OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
> "branch any", "sample any taken branches",
> parse_branch_stack),
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 90289f31dd87..0b68e0538107 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -1240,8 +1240,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
> goto out;
>
> err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
> - evlist->threads, trace__tool_process, false,
> - trace->opts.proc_map_timeout, 1);
> + evlist->threads, trace__tool_process, false, 1);
> out:
> if (err)
> symbol__exit();
> @@ -3242,7 +3241,6 @@ int cmd_trace(int argc, const char **argv)
> .user_interval = ULLONG_MAX,
> .no_buffering = true,
> .mmap_pages = UINT_MAX,
> - .proc_map_timeout = 500,
> },
> .output = stderr,
> .show_comm = true,
> @@ -3310,8 +3308,6 @@ int cmd_trace(int argc, const char **argv)
> "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
> OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
> "print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
> - OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
> - "per thread proc mmap processing timeout in ms"),
> OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
> trace__parse_cgroups),
> OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> index 21bf7f5a3cf5..0e2aafd8bb6e 100644
> --- a/tools/perf/perf.h
> +++ b/tools/perf/perf.h
> @@ -81,7 +81,6 @@ struct record_opts {
> unsigned initial_delay;
> bool use_clockid;
> clockid_t clockid;
> - unsigned int proc_map_timeout;
> };
>
> struct option;
> diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
> index 6b049f3f5cf4..dbf2c69944d2 100644
> --- a/tools/perf/tests/code-reading.c
> +++ b/tools/perf/tests/code-reading.c
> @@ -599,7 +599,7 @@ static int do_test_code_reading(bool try_kcore)
> }
>
> ret = perf_event__synthesize_thread_map(NULL, threads,
> - perf_event__process, machine, false, 500);
> + perf_event__process, machine, false);
> if (ret < 0) {
> pr_debug("perf_event__synthesize_thread_map failed\n");
> goto out_err;
> diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
> index 2f008067d989..7c8d2e422401 100644
> --- a/tools/perf/tests/dwarf-unwind.c
> +++ b/tools/perf/tests/dwarf-unwind.c
> @@ -34,7 +34,7 @@ static int init_live_machine(struct machine *machine)
> pid_t pid = getpid();
>
> return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
> - mmap_handler, machine, true, 500);
> + mmap_handler, machine, true);
> }
>
> /*
> diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c
> index b1af2499a3c9..5ede9b561d32 100644
> --- a/tools/perf/tests/mmap-thread-lookup.c
> +++ b/tools/perf/tests/mmap-thread-lookup.c
> @@ -132,7 +132,7 @@ static int synth_all(struct machine *machine)
> {
> return perf_event__synthesize_threads(NULL,
> perf_event__process,
> - machine, 0, 500, 1);
> + machine, 0, 1);
> }
>
> static int synth_process(struct machine *machine)
> @@ -144,7 +144,7 @@ static int synth_process(struct machine *machine)
>
> err = perf_event__synthesize_thread_map(NULL, map,
> perf_event__process,
> - machine, 0, 500);
> + machine, 0);
>
> thread_map__put(map);
> return err;
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index bc646185f8d9..92b09b2ba6bf 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -317,19 +317,39 @@ static int perf_event__synthesize_fork(struct perf_tool *tool,
> return 0;
> }
>
> +static int dec(char ch)
> +{
> + if ((ch >= '0') && (ch <= '9'))
> + return ch - '0';
> + return -1;
> +}
> +
> +static int dec2u64(const char *ptr, u64 *long_val)
> +{
> + const char *p = ptr;
> +
> + *long_val = 0;
> + while (*p) {
> + const int dec_val = dec(*p);
> +
> + if (dec_val < 0)
> + break;
> +
> + *long_val = (*long_val * 10) + dec_val;
> + p++;
> + }
> + return p - ptr;
> +}
> +
> int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> union perf_event *event,
> pid_t pid, pid_t tgid,
> perf_event__handler_t process,
> struct machine *machine,
> - bool mmap_data,
> - unsigned int proc_map_timeout)
> + bool mmap_data)
> {
> char filename[PATH_MAX];
> FILE *fp;
> - unsigned long long t;
> - bool truncation = false;
> - unsigned long long timeout = proc_map_timeout * 1000000ULL;
> int rc = 0;
> const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
> int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
> @@ -350,87 +370,99 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> }
>
> event->header.type = PERF_RECORD_MMAP2;
> - t = rdclock();
>
> while (1) {
> - char bf[BUFSIZ];
> - char prot[5];
> - char execname[PATH_MAX];
> + char bf[BUFSIZ], *pbf = bf;
> char anonstr[] = "//anon";
> - unsigned int ino;
> + char *execname;
> size_t size;
> ssize_t n;
> + u64 tmp;
>
> if (fgets(bf, sizeof(bf), fp) == NULL)
> break;
>
> - if ((rdclock() - t) > timeout) {
> - pr_warning("Reading %s time out. "
> - "You may want to increase "
> - "the time limit by --proc-map-timeout\n",
> - filename);
> - truncation = true;
> - goto out;
> - }
> -
> - /* ensure null termination since stack will be reused. */
> - strcpy(execname, "");
> -
> /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
> - n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
> - &event->mmap2.start, &event->mmap2.len, prot,
> - &event->mmap2.pgoff, &event->mmap2.maj,
> - &event->mmap2.min,
> - &ino, execname);
> -
> - /*
> - * Anon maps don't have the execname.
> - */
> - if (n < 7)
> + n = hex2u64(pbf, &event->mmap2.start);
> + if (n < 0)
> continue;
> -
> - event->mmap2.ino = (u64)ino;
> -
> - /*
> - * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
> - */
> - if (machine__is_host(machine))
> - event->header.misc = PERF_RECORD_MISC_USER;
> - else
> - event->header.misc = PERF_RECORD_MISC_GUEST_USER;
> + pbf += n + 1;
> + n = hex2u64(pbf, &event->mmap2.len);
> + if (n < 0)
> + continue;
> + pbf += n + 1;
>
> /* map protection and flags bits */
> event->mmap2.prot = 0;
> event->mmap2.flags = 0;
> - if (prot[0] == 'r')
> + if (pbf[0] == 'r')
> event->mmap2.prot |= PROT_READ;
> - if (prot[1] == 'w')
> + if (pbf[1] == 'w')
> event->mmap2.prot |= PROT_WRITE;
> - if (prot[2] == 'x')
> + if (pbf[2] == 'x')
> event->mmap2.prot |= PROT_EXEC;
>
> - if (prot[3] == 's')
> + if (pbf[3] == 's')
> event->mmap2.flags |= MAP_SHARED;
> else
> event->mmap2.flags |= MAP_PRIVATE;
>
> - if (prot[2] != 'x') {
> - if (!mmap_data || prot[0] != 'r')
> + if (pbf[2] != 'x') {
> + if (!mmap_data || pbf[0] != 'r')
> continue;
>
> event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
> }
>
> -out:
> - if (truncation)
> - event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
> + pbf += 5;
> + n = hex2u64(pbf, &event->mmap2.pgoff);
> + if (n < 0)
> + continue;
> + pbf += n + 1;
> +
> + n = hex2u64(pbf, &tmp);
> + if (n < 0)
> + continue;
> + event->mmap2.maj = tmp;
> + pbf += n + 1;
> +
> + n = hex2u64(pbf, &tmp);
> + if (n < 0)
> + continue;
> + event->mmap2.min = tmp;
> + pbf += n + 1;
>
> - if (!strcmp(execname, ""))
> - strcpy(execname, anonstr);
> + n = dec2u64(pbf, &event->mmap2.ino);
> + if (n < 0)
> + continue;
> + pbf += n;
> +
> + execname = strchr(pbf, '/');
> + if (!execname)
> + execname = strchr(pbf, '[');
> +
> + /*
> + * Anon map, skip.
> + */
> + if (!execname)
> + continue;
> +
> + pbf = strchr(execname, '\n');
> + if (!pbf)
> + continue;
> + *pbf = '\0';
> +
> + /*
> + * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
> + */
> + if (machine__is_host(machine))
> + event->header.misc = PERF_RECORD_MISC_USER;
> + else
> + event->header.misc = PERF_RECORD_MISC_GUEST_USER;
>
> if (hugetlbfs_mnt_len &&
> !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
> - strcpy(execname, anonstr);
> + execname = anonstr;
> event->mmap2.flags |= MAP_HUGETLB;
> }
>
> @@ -449,9 +481,6 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> rc = -1;
> break;
> }
> -
> - if (truncation)
> - break;
> }
>
> fclose(fp);
> @@ -520,8 +549,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> perf_event__handler_t process,
> struct perf_tool *tool,
> struct machine *machine,
> - bool mmap_data,
> - unsigned int proc_map_timeout)
> + bool mmap_data)
> {
> char filename[PATH_MAX];
> DIR *tasks;
> @@ -547,8 +575,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> */
> if (pid == tgid &&
> perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
> - process, machine, mmap_data,
> - proc_map_timeout))
> + process, machine, mmap_data))
> return -1;
>
> return 0;
> @@ -597,7 +624,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
> if (_pid == pid) {
> /* process the parent's maps too */
> rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
> - process, machine, mmap_data, proc_map_timeout);
> + process, machine, mmap_data);
> if (rc)
> break;
> }
> @@ -611,8 +638,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> struct thread_map *threads,
> perf_event__handler_t process,
> struct machine *machine,
> - bool mmap_data,
> - unsigned int proc_map_timeout)
> + bool mmap_data)
> {
> union perf_event *comm_event, *mmap_event, *fork_event;
> union perf_event *namespaces_event;
> @@ -642,7 +668,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> fork_event, namespaces_event,
> thread_map__pid(threads, thread), 0,
> process, tool, machine,
> - mmap_data, proc_map_timeout)) {
> + mmap_data)) {
> err = -1;
> break;
> }
> @@ -668,7 +694,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
> fork_event, namespaces_event,
> comm_event->comm.pid, 0,
> process, tool, machine,
> - mmap_data, proc_map_timeout)) {
> + mmap_data)) {
> err = -1;
> break;
> }
> @@ -689,7 +715,6 @@ static int __perf_event__synthesize_threads(struct perf_tool *tool,
> perf_event__handler_t process,
> struct machine *machine,
> bool mmap_data,
> - unsigned int proc_map_timeout,
> struct dirent **dirent,
> int start,
> int num)
> @@ -733,8 +758,7 @@ static int __perf_event__synthesize_threads(struct perf_tool *tool,
> */
> __event__synthesize_thread(comm_event, mmap_event, fork_event,
> namespaces_event, pid, 1, process,
> - tool, machine, mmap_data,
> - proc_map_timeout);
> + tool, machine, mmap_data);
> }
> err = 0;
>
> @@ -754,7 +778,6 @@ struct synthesize_threads_arg {
> perf_event__handler_t process;
> struct machine *machine;
> bool mmap_data;
> - unsigned int proc_map_timeout;
> struct dirent **dirent;
> int num;
> int start;
> @@ -766,7 +789,7 @@ static void *synthesize_threads_worker(void *arg)
>
> __perf_event__synthesize_threads(args->tool, args->process,
> args->machine, args->mmap_data,
> - args->proc_map_timeout, args->dirent,
> + args->dirent,
> args->start, args->num);
> return NULL;
> }
> @@ -775,7 +798,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
> perf_event__handler_t process,
> struct machine *machine,
> bool mmap_data,
> - unsigned int proc_map_timeout,
> unsigned int nr_threads_synthesize)
> {
> struct synthesize_threads_arg *args = NULL;
> @@ -805,7 +827,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
> if (thread_nr <= 1) {
> err = __perf_event__synthesize_threads(tool, process,
> machine, mmap_data,
> - proc_map_timeout,
> dirent, base, n);
> goto free_dirent;
> }
> @@ -827,7 +848,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
> args[i].process = process;
> args[i].machine = machine;
> args[i].mmap_data = mmap_data;
> - args[i].proc_map_timeout = proc_map_timeout;
> args[i].dirent = dirent;
> }
> for (i = 0; i < m; i++) {
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index bfa60bcafbde..45a3b47fc82c 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -412,7 +412,6 @@ struct events_stats {
> u32 nr_unknown_id;
> u32 nr_unprocessable_samples;
> u32 nr_auxtrace_errors[PERF_AUXTRACE_ERROR_MAX];
> - u32 nr_proc_map_timeout;
> };
>
> enum {
> @@ -669,8 +668,7 @@ typedef int (*perf_event__handler_t)(struct perf_tool *tool,
> int perf_event__synthesize_thread_map(struct perf_tool *tool,
> struct thread_map *threads,
> perf_event__handler_t process,
> - struct machine *machine, bool mmap_data,
> - unsigned int proc_map_timeout);
> + struct machine *machine, bool mmap_data);
> int perf_event__synthesize_thread_map2(struct perf_tool *tool,
> struct thread_map *threads,
> perf_event__handler_t process,
> @@ -682,7 +680,6 @@ int perf_event__synthesize_cpu_map(struct perf_tool *tool,
> int perf_event__synthesize_threads(struct perf_tool *tool,
> perf_event__handler_t process,
> struct machine *machine, bool mmap_data,
> - unsigned int proc_map_timeout,
> unsigned int nr_threads_synthesize);
> int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
> perf_event__handler_t process,
> @@ -797,8 +794,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> pid_t pid, pid_t tgid,
> perf_event__handler_t process,
> struct machine *machine,
> - bool mmap_data,
> - unsigned int proc_map_timeout);
> + bool mmap_data);
>
> int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
> perf_event__handler_t process,
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 111ae858cbcb..6427a74ebc4a 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -2443,15 +2443,13 @@ int machines__for_each_thread(struct machines *machines,
> int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
> struct target *target, struct thread_map *threads,
> perf_event__handler_t process, bool data_mmap,
> - unsigned int proc_map_timeout,
> unsigned int nr_threads_synthesize)
> {
> if (target__has_task(target))
> - return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap, proc_map_timeout);
> + return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
> else if (target__has_cpu(target))
> return perf_event__synthesize_threads(tool, process,
> machine, data_mmap,
> - proc_map_timeout,
> nr_threads_synthesize);
> /* command specified */
> return 0;
> diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
> index d856b85862e2..688d84ba823a 100644
> --- a/tools/perf/util/machine.h
> +++ b/tools/perf/util/machine.h
> @@ -247,17 +247,14 @@ int machines__for_each_thread(struct machines *machines,
> int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
> struct target *target, struct thread_map *threads,
> perf_event__handler_t process, bool data_mmap,
> - unsigned int proc_map_timeout,
> unsigned int nr_threads_synthesize);
> static inline
> int machine__synthesize_threads(struct machine *machine, struct target *target,
> struct thread_map *threads, bool data_mmap,
> - unsigned int proc_map_timeout,
> unsigned int nr_threads_synthesize)
> {
> return __machine__synthesize_threads(machine, NULL, target, threads,
> perf_event__process, data_mmap,
> - proc_map_timeout,
> nr_threads_synthesize);
> }
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 7d2c8ce6cfad..33d2c50cdc18 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1261,8 +1261,6 @@ static int machines__deliver_event(struct machines *machines,
> case PERF_RECORD_MMAP:
> return tool->mmap(tool, event, sample, machine);
> case PERF_RECORD_MMAP2:
> - if (event->header.misc & PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT)
> - ++evlist->stats.nr_proc_map_timeout;
> return tool->mmap2(tool, event, sample, machine);
> case PERF_RECORD_COMM:
> return tool->comm(tool, event, sample, machine);
> @@ -1640,17 +1638,6 @@ static void perf_session__warn_about_errors(const struct perf_session *session)
> perf_session__warn_order(session);
>
> events_stats__auxtrace_error_warn(stats);
> -
> - if (stats->nr_proc_map_timeout != 0) {
> - ui__warning("%d map information files for pre-existing threads were\n"
> - "not processed, if there are samples for addresses they\n"
> - "will not be resolved, you may find out which are these\n"
> - "threads by running with -v and redirecting the output\n"
> - "to a file.\n"
> - "The time limit to process proc map is too short?\n"
> - "Increase it by --proc-map-timeout\n",
> - stats->nr_proc_map_timeout);
> - }
> }
>
> static int perf_session__flush_thread_stack(struct thread *thread,

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