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perf hists browser: Warn about lost events

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Just like the old perf top --tui and the --stdio version.

But because we have the initial menu to choose which event to show in a
session with multiple events we can see how many chunks were lost in
each of the event types, clarifying which events are being affected the
most.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-47yyqbubmjzch2chezmb21m6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2011-10-29 12:15:04 -02:00
parent 1ca4ff41a3
commit 7b27509fc6
7 changed files with 112 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
tools/perf/builtin-top.c
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@ -89,6 +89,7 @@ static bool vmlinux_warned;
static bool inherit = false;
static int realtime_prio = 0;
static bool group = false;
static bool sample_id_all_avail = true;
static unsigned int mmap_pages = 128;
static bool dump_symtab = false;
@ -289,11 +290,13 @@ static void print_sym_table(void)
printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
if (top.total_lost_warned != top.session->hists.stats.total_lost) {
top.total_lost_warned = top.session->hists.stats.total_lost;
color_fprintf(stdout, PERF_COLOR_RED, "WARNING:");
printf(" LOST %" PRIu64 " events, Check IO/CPU overload\n",
top.total_lost_warned);
if (top.sym_evsel->hists.stats.nr_lost_warned !=
top.sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
top.sym_evsel->hists.stats.nr_lost_warned =
top.sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
color_fprintf(stdout, PERF_COLOR_RED,
"WARNING: LOST %d chunks, Check IO/CPU overload",
top.sym_evsel->hists.stats.nr_lost_warned);
++printed;
}
@ -671,6 +674,7 @@ static int symbol_filter(struct map *map __used, struct symbol *sym)
}
static void perf_event__process_sample(const union perf_event *event,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct perf_session *session)
{
@ -770,12 +774,8 @@ static void perf_event__process_sample(const union perf_event *event,
}
if (al.sym == NULL || !al.sym->ignore) {
struct perf_evsel *evsel;
struct hist_entry *he;
evsel = perf_evlist__id2evsel(top.evlist, sample->id);
assert(evsel != NULL);
if ((sort__has_parent || symbol_conf.use_callchain) &&
sample->callchain) {
err = perf_session__resolve_callchain(session, al.thread,
@ -807,6 +807,7 @@ static void perf_event__process_sample(const union perf_event *event,
static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
{
struct perf_sample sample;
struct perf_evsel *evsel;
union perf_event *event;
int ret;
@ -817,10 +818,16 @@ static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
continue;
}
evsel = perf_evlist__id2evsel(self->evlist, sample.id);
assert(evsel != NULL);
if (event->header.type == PERF_RECORD_SAMPLE)
perf_event__process_sample(event, &sample, self);
else
perf_event__process_sample(event, evsel, &sample, self);
else if (event->header.type < PERF_RECORD_MAX) {
hists__inc_nr_events(&evsel->hists, event->header.type);
perf_event__process(event, &sample, self);
} else
++self->hists.stats.nr_unknown_events;
}
}
@ -864,6 +871,8 @@ static void start_counters(struct perf_evlist *evlist)
attr->mmap = 1;
attr->comm = 1;
attr->inherit = inherit;
retry_sample_id:
attr->sample_id_all = sample_id_all_avail ? 1 : 0;
try_again:
if (perf_evsel__open(counter, top.evlist->cpus,
top.evlist->threads, group,
@ -873,6 +882,12 @@ try_again:
if (err == EPERM || err == EACCES) {
ui__error_paranoid();
goto out_err;
} else if (err == EINVAL && sample_id_all_avail) {
/*
* Old kernel, no attr->sample_id_type_all field
*/
sample_id_all_avail = false;
goto retry_sample_id;
}
/*
* If it's cycles then fall back to hrtimer