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Subject[PATCH 6/6] perf top tui: Wait till the first sample to refresh the screen.
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 21 +++++++++++++++++++--
tools/perf/util/top.h | 1 +
2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 0b07cc3..417f757 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -72,6 +72,7 @@ static struct perf_top top = {
.target_tid = -1,
.active_symbols = LIST_HEAD_INIT(top.active_symbols),
.active_symbols_lock = PTHREAD_MUTEX_INITIALIZER,
+ .active_symbols_cond = PTHREAD_COND_INITIALIZER,
.freq = 1000, /* 1 KHz */
};

@@ -577,7 +578,17 @@ static void handle_keypress(struct perf_session *session, int c)

static void *display_thread_tui(void *arg __used)
{
- perf_top__tui_browser(&top);
+ int err = 0;
+ pthread_mutex_lock(&top.active_symbols_lock);
+ while (list_empty(&top.active_symbols)) {
+ err = pthread_cond_wait(&top.active_symbols_cond,
+ &top.active_symbols_lock);
+ if (err)
+ break;
+ }
+ pthread_mutex_unlock(&top.active_symbols_lock);
+ if (!err)
+ perf_top__tui_browser(&top);
exit_browser(0);
exit(0);
return NULL;
@@ -776,8 +787,14 @@ static void perf_event__process_sample(const union perf_event *event,
syme->count[evsel->idx]++;
record_precise_ip(syme, evsel->idx, ip);
pthread_mutex_lock(&top.active_symbols_lock);
- if (list_empty(&syme->node) || !syme->node.next)
+ if (list_empty(&syme->node) || !syme->node.next) {
+ static bool first = true;
__list_insert_active_sym(syme);
+ if (first) {
+ pthread_cond_broadcast(&top.active_symbols_cond);
+ first = false;
+ }
+ }
pthread_mutex_unlock(&top.active_symbols_lock);
}
}
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index e8d28e2..96d1cb7 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -35,6 +35,7 @@ struct perf_top {
*/
struct list_head active_symbols;
pthread_mutex_t active_symbols_lock;
+ pthread_cond_t active_symbols_cond;
u64 samples;
u64 kernel_samples, us_samples;
u64 exact_samples;
--
1.6.2.5


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